Distribution of dichlorobenzenes in sediment and water of Suqu¨ªa River basin (C¨®rdoba-Argentina) by an optimised SPME-GC-MS procedure

MONFERRÁN, M. V.; CORTINA, P.R.; SANTIAGO, A.N.; WUNDERLIN, D.A.

INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH

TAYLOR & FRANCIS LTD

Lugar: London; Año: 2010 vol. 3 p. 363 - 378

0960-3123

Three dichlorobenzene isomers (DCBs) were monitored in water and sediment from the Suqu¨ªa River basin by Solid Phase Microextraction (HS-SPME), coupled to Gas Chromatography¨CMass Spectrometry (GC¨CMS). DCBs were not detected in water or sediments corresponding to the upper basin. Pollution with DCBs became evident when the river flows through small cities. As expected, C¨®rdoba city causes the most severe pollution, presenting up to 764.7 ¦Ìg kg¨C1 DW DCBs in the sediment of urban areas. Results show that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. ¦Ìg kg¨C1 DW DCBs in the sediment of urban areas. Results show that DCBs mainly originate in domestic activities, reaching the river by non-point sources such as urban run-off or sewage discharge, resulting in a widespread distribution in the basin. The high level of DCBs found in sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin. sediments involves absorption of these xenobiotics in the natural organic matter of sediments. This organic layer could be responsible for transporting DCBs downstream from their discharge, thus spreading the pollution throughout the basin.