Abstract:

Typical farmland soil samples of Changchun, Dehui, Fuyu, Gongzhuling, Yongji were collected with grid method. The residues of organochlorine pesticides(OCPs) in soil and the distribution were measured and the composition and sources of organochlorine pesticide residues were discussed. The results show that HCHs and DDTs of the study areas had higher detection rate. The total OCPs content of the residues was in a range of 1.45~83.88 ng/g. HCHs and DDTs were found widely in all the samples with a range of 1.17~27.83 ng/g and 1.45~81.75 ng/g respectively. The residue levels in different lands were in the order as follows: Changchun>Gongzhuling>Yongji>Dehui>Fuyu. A significant positive correlation existed between the total amount of OCPs and that of TOC was showed. The source analysis shows that the average value of α-HCH/γ-HCH of survey region was 0.37, indicating that there was a large number of lindane imported recently. The DDTs pesticide composition displays that P,P′-DDT/(P,P′-DDD+P,P′DDE) values of each sampling site except Gongzhuling were less than 1, indicating the sources of DDTs were residues historically. Gongzhuling was likely contaminated by industrial DDTs. From the results of factor analysis and cluster analysis, we conclude that the content of organochlorine pesticides causing Changchun area pollution is significantly higher than those of other regions. From the analysis of pollutant factor, γ-HCH and P,P′-DDT are the major pollutants.

Key words: soil of Jilin Province, organochlorine pesticides, residue, distribution character