Distribution Characteristics of Organochlorine Pesticides in Western Songnen Plain, China
Concentrations of hexachlorocyclohexane (BHC) metabolites and dichlorodiphenyltrichloroethane (DDT) derivatives in the soil, runoff from paddy and dry land as well as mallard eggs in western Songnen Plain were investigated. The concentrations of BHC and DDT in soil and runoff were low and β-BHC accounting for 73.5%-99.5% of the total BHC concentrations was the main metabolite of BHC in runoff, and four metabolites descended in the order: β>α>γ>δ. DDT is still used locally as p, p’-DDT was detected in the study area. Dissoluble fraction was the dominant form of metabolites and derivatives, and the particle size of suspended substance had significant effect on the pesticide residues in runoff. There were organochlorine pesticides (OCPs) accumulated in the mallard eggs in Songnen Plain, and the residue levels of OCPs were at the same order of magnitude as that in topsoil and suspended substance, but one order of magnitude higher than that of runoff and return flow in farmland. For organism, especially benthon, DDT concentrations posed low ecological risk, while BHC had potential ecological risk in suspended substance of return flow in paddy field.
agricultural runoff BHC DDT western Songnen Plain mallard eggs
YAN Baixing CAO Huicong LUAN Zhaoqing
Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130012,Jilin,China
国际会议
2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)
上海
英文
1262-1267
2009-06-02（万方平台首次上网日期，不代表论文的发表时间）