Residues of organochlorine pesticides in surface soils from college school yardsin Beijing, China
WANG Xiaofei , WANG Dianzhong , QIN Xiaofei , XU Xiaobai
DOI:
Received November 07, 2007,Revised January 15, 2008, Accepted , Available online
Volume 20,2008,Pages 1090-1096
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Organochlorine pesticides (OCPs) have been a major environmental issue, attracting much scientific concern because of their nature
of toxicity, persistence, and endocrine disrupting e ects. Soil samples were collected from ten college school yards in Beijing in 2006
and analyzed to determine fifteen OCPs. Dichlorodiphenyltrichloroethanes (DDTs) were found to be the main pollutants, accounting for
93.70% of total OCPs, followed by hexachlorohexanes (HCHs) (2.25%) and hexachlorobenzene (HCB) (1.82%). Content of chlordanes
(CHLs), heptachlors (HEPTs), and endosulfans comprised 0.51%, 1.05%, and 0.79% of fifteen OCPs, respectively. The preliminary
pollution assessment indicated that DDTs have caused high OCPs levels in some schools. Source identification showed that HCHs in
soils were originated from an old mixed source of technical HCHs and lindane. And DDTs were mainly from mixed use of technical
DDTs and dicofol containing DDT impurities. According to GB15618-1995 (guidelines of Chinese environmental quality standards for
soils), HCHs and DDTs levels might be categorized as little and low polluting pesticides. This study indicated that the environmental
quality of college school yards with large green land were not as good as was expected and there existed potential exposure risk of
college population to OCPs.
