IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Records of organochlorine pesticides DDT, HCH, PeCB and HCB in the southwest of Buenos Aires Province, Argentina
Autor/es:
TOMBESI NORMA; ANDRÉS H. ARIAS; KLANOVA J.; ALVAREZ, MÓNICA; AUDY O.; POZO KARLA; PRIBYLOBA, PETRA
Lugar:
Puerto Madryn, Chubut, Argentina
Reunión:
Congreso; IV Reunión Argentina de Geoquímica de la Superficie (IV RAGSU); 2016
Institución organizadora:
CESIMAR-CENPAT-CONICET
Resumen:
Thirteen superficial sediment/soil samples used in this study were collected from different sites along the Bahia Blanca Estuary and surrounding sites, located in the Buenos Aires Province southwest, Argentina, to assess the concentration levels and spatial distribution of 12 selected organochlorine pesticides (OCs). Despite the official ban and restriction on the usage of these pesticides, their presence was detected in all samples. ∑OCs in soil/sediments ranged between 0.20 and 1040.44 ng g-1 dw (mean = 82.37 and SD = 276.6 ng g-1 dw). DDTs (sum of DDD, DDE, and DDT) ranged from 0.08 to 1039.95 ng g-1 dw (mean = 81.31 and SD = 276.7 ng g-1 dw), HCHs (sum of -HCH, -HCH,-HCH and-HCH) from 0.08 to 0.88 ng g -1 (mean = 0.43 and SD = 0.23 ng g-1 dw). Lower concentrations were found for PeCB (mean = 0.095 and SD 0.17 ng g-1 dw) and HCB (mean = 0.56 and SD 1.7 ng g-1 dw). DDTs were detected in significant concentrations in Bahia Blanca and Dorrego sampling locations; despite this, a major reductive dechlorination process of DDTs to DDEs under aerobic conditions was suggested to be in course. On the other side, HCHs were found in higher proportions at Cuatreros, Maldonado, Galvan, and PBB locations. In comparison to other worldwide locations and to the world coastal sediment concentrations range, in general, soil/sediment DDTs and HCHs levels were in the low/medium range with exceptionally high DDT levels hotspot. According to international criteria about sediment quality guidelines for DDTs and Lindane (Arias et al., 2010), the levels found in this study are consistent with low to intermediate ecotoxicological risk assessment.