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| Organochlorine Pesticides（OCPs） in Soils of Pearl River Delta, China |
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| KeyWord:organochlorine pesticides（OCPs）; DDT metabolites; soil; distribution |
| Author Name | Affiliation | | DIE Qing-qi | Chinese Research Academy of Environmental Science，Beijing 100012，China | | NIE Zhi-qiang | Chinese Research Academy of Environmental Science，Beijing 100012，China | | HUANG Qi-fei | Chinese Research Academy of Environmental Science，Beijing 100012，China | | ZHU Xiao-hua | Chinese Research Academy of Environmental Science，Beijing 100012，China |
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| Abstract: |
| Organochlorine pesticides（OCPs） could exist in the environment for long time though they had been phased out. This study investigated concentrations, distribution and possible sources of OCPs in surface soils in the Pearl River Delta, south China. Most of the 17 OCPs were detected in the soils. The detection rates were 100% for 13 OCPs. Total concentrations of all 17 OCPs（Σ17OCPs） ranged from 7.40 to 35.1 ng·g-1 with a mean of 16.7 ng·g-1. Of OCPs, DDTs and HCHs were the major components in the soils, with concentrations ranging from 1.83~16.6 ng·g-1 and 2.62~11.8 ng·g-1, respectively. In addition, DDT metabolites, such as DDMU and DBP, were also detected in the soils. They ranged from ND~1.42 ng·g-1, and 0.14 to 1.82 ng·g-1, respectively. Source assessments indicated that most of the HCHs in the soils came from historical applications of HCHs, but some from lindane（γ-HCH）use. Historical applications of DDTs contributed to its major part in the soils. Additionally, inputs of dicofol mixture were also new sources of OCPs in this region. |
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