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Organochlorinated agrochemicals residues were monitored in the surface sediments of the following rivers: Chopim and its tributaries; Caldeiras, Bandeira and Lontras, all located in the city of Palmas-PR. The organochlorinated agrochemicals studied were extracted from the surface sediment samples using a SOXHLET extractor. The extracts were analyzed by mass detector gas chromatography. Eight organochlorinated agrochemicals: BHC, aldrin, heptachlor-epoxide, chlordane, iso-chlordane, endrin, DDT and metoxichlor were found in the surface sediments. BHC and chlordane were detected in 80% of the samples. High concentrations of DDT over 0.205 μg/L were found at several sites. Heptachlor-epoxide, endrin and metoxichlor were the less common agrochemicals recorded. The presence of aldrin at a sample site, located upstream from the intake for the water supply of the Palmas population presents a major toxicological risk.

rbrh

Verificação dos Teores Residuais de Agroquímicos Organoclorados em Sedimentos de Superfície no Rio Chopim e seus Afluentes; Rio Caldeiras, Rio Bandeira e Rio Lontras no Município de Palmas - PR