Risk Evaluation on the Pcbs and Ocps Residues in the Water of Irtysh River

Abstract To enhance the prevention and control of OCPs and PCBs pollution, the status of pollution by both in the Irtysh River was analyzed, and a risk evaluation was made on it. The pollutant residue amounts at the 18 sampling sites were shown as follows, including α-HCH: ND − 8.2269 ng/L, δ-HCH: ND − 6.7385 ng/L, β-HCH: ND − 5.2714 ng/L, γ-HCH: ND − 0.1320 ng/L, PCB 28: ND − 0.4111 ng/L, Aldrin: ND − 3.7320 ng/L, Dieldrin: ND − 4.8551 ng/L and Endrin: ND − 6.1473 ng/L. It was found from the source of OCPs that HCHs came from the historical use of industrial HCHs, while Aldrin, Dieldrin and Endrin came from the use of pesticides. By PCA (principal component analysis), three principal components were extracted. The total variance explained came to 95.98%, a result of the use of HCHs, the variation in OCPs materials and the research about pest attack features in the region. Further ecological risk evaluations indicated that affected by the use of pesticides, the ecological risk of OCPs at the upper reaches of Irtysh River was higher than that at other sites. It was necessary to extend the test objects, test types and test cycles to safeguard the ecological security and human health.