IDASZKIN Yanina Lorena
Soil metal pollution assessment in Sarcocornia salt marshes in a South American estuary
NEGRIN, VANESA; IDASZKIN , YANINA LORENA; DOMINI, CLAUDIA; SIMONETTI, PIA; BOTTE, SANDRA E
MARINE POLLUTION BULLETIN
PERGAMON-ELSEVIER SCIENCE LTD
Soil metal pollution in two Sarcocornia salt marshes within the Bahía Blanca estuary (Argentina, South America)was evaluated through pseudo-total and bioavailable metal levels and pollution indexes. Soil conditions werealso studied. The pseudo-total metal concentrations were similar in both salt marshes and followed the samedecreasing order: Fe > Zn > Cu > Cr > Ni > Pb > Cd. Bioavailable metals presented different patterns betweensalt marshes. The percentages of the bioavailable fraction varied between 28 and 80%, being higher than 60% forCu, Zn and Pb. Organic matter ruled the distribution of all metals, except Pb. Using shale average concentrationas background level, indexes did not show pollution nor enrichment, whereas using as background levels localvalues, anthropogenic enrichment was found for all metals and most metals showed moderate metal pollution.Our results showed that bioavailable metals levels and indexes using local background values provide anadequate assessment of metal pollution in salt marsh soils.