Abstract
Water samples, collected trimonthly along the Uruguay River between February 1988 and December 1989, were analyzed for alpha- and gamma-HCH, heptachlor and its epoxide, aldrin, dieldrin, and the o-p′ and p-p′ isomers of DDE, DDD and DDT to assess the present status of the contamination in this South American region. In general, chlorinated pesticides were encountered at very low concentrations. HCH isomers were the most commonly detected compounds with concentrations ranging from the detection limits to 10 ng L−1. Heptachlor, heptachlor epoxide, aldrin, dieldrin, p-p′ DDE and p-p′ DDT were occasionally encountered while o-p′ DDE, p-p′ DDD, o-p′ DDD and o-p′ DDT were never detected. Compared to previous studies in the area, the present data seems to indicate that there was a decrease in the concentrations of these compounds.
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Janiot, L.J., Sericano, J.L. & Roses, O.E. Chlorinated pesticide occurrence in the Uruguay River (Argentina-Uruguay). Water Air Soil Pollut 76, 323–331 (1994). https://doi.org/10.1007/BF00482709
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DOI: https://doi.org/10.1007/BF00482709