DDT in fishes and soils of lakes from Brazilian Amazon: Case study of Puruzinho lake (Amazon, Brazil)

Abstract

DDT concentrations had been quantified in fishes and at 20 points along the "Puruzinho" lake. The determination of pollutants in the samples consisted in four consecutive steps: extraction, clean-up, fractionation and automatic injection in high resolution gas chromatography coupled to an electron capture detector. The ∑DDT results in fishes (ng g-1 dry weight) ranged from 0.3 to 71.4. The concentrations of ∑DDT on house soils varied from 2.0 to 55.4 ng.g-1 while forest soils the obtained values were between 1.6 e 13.3 ng g-1. The Shapiro-Wilk test showed that the distribution was not normal for both the results of the soil of the houses (p < 0.001) as well as for the forest soils (p < 0.007). The U test of Mann-Whitney reveled that there were no significant difference between the results obtained for both houses and forest soils (p > 0.290). © 2010 Sociedade Brasileira de Química.