DDT I JEGO METABOLITY W POWIERZCHNIOWYCH OSADACH JEZIOR I RZEK POLSKI

Abstract

DDT AND ITS METABOLITES IN SURFACE SEDIMENTS OF LAKES AND RIVERS OF POLANDAbstract. The contents of p,p'-DDT, p,p'-DDh, p,p'-DDD were determined in 300 samples of river sediments and 150 samples of lake sediments, collected from the whole area of Poland, by using the GC-ECD method. In river sediments the maximum contents were as follows: p,p'-DDT - 2780 µg/kg, p,p'-DDD - 913 µg/kg. and p,p'-DDE -298 µg/kg. The presence of p,p'-DDT was detected in 38.9% of the samples, p,p'-DDE - in 90.0%, and p,p'-DDD - in 78.4%. The ratio of p,p'-DDD/p,p'-DDT in river sediments ranged from 0.08 to 46.3, and the ratio of p,p'-DDE/p,p'-DDT was in the range of 0.04—24.7. In the lake sediments the contents of p,p'-DDT ranged up to 4.7 µg/kg, p,p'-DDE - up to 63.5 µg/kg, and p.p'-DDD - up to 70.1 µg/kg. The presence of p.p'-DDT was detected in 36% of the samples, p,p'-DDD - in 96.67%, and the metabolite p,p'-DDE - in alt samples. The ratio of p,p'-DDD/p,p'-DDT in lake sediments ranged from 0.4 to 112.2, and the ratio of p,p'-DDE/p,p'-DDT was in the range of 0.2-163.8. In the lake sediments, a high correlation of the contents of DDTs with the concentrations of Cd, Hg, Pb and Zn, and a significant correlation with the phosphorus and sulphur content were found. In the river sediments, a weak correlation with the TOC content is the only one noticed.