Contamination of soils with organochlorine pesticides in urban parks in Beijing, China.
Urban parks are an integral component of healthy urban living. Since they are frequently visited, an understanding of the environmental quality of these urban facilities is crucial. Here, a study was conducted on the contamination of soils in the parks of Beijing. Organochlorine pesticides (OCPs), which have the potential to cause endocrine disturbances, were considered study objectives. Hexachlorocyclohexanes (HCHs) were found at concentrations of 0.2490-197.0 ng g(-1) and dichlorodiphenyltrichloroethanes (DDTs) were found at concentrations of 5.942-1039 ng g(-1) in the soils investigated. The preliminary pollution assessment indicated that DDTs have caused high pollution levels in the soils of some parks. Analysis of the sources of contamination showed that HCHs in the soils were derived from an old mixed source of technical HCHs and lindane and that DDTs, which were suspected to have recent application to the soils at some sites, were derived mainly from a mixture of technical DDTs and dicofol containing DDT impurities. An independent sample t-test proved that pesticides containing DDTs had been used in large amounts in the soils of parks before 1983 (p<0.05) and that the levels of DDTs in the soils of parks administered by the Beijing municipal government were significantly higher than the levels in those administered by the district government (p<0.05). However, the main difference in this situation needs to be further studied. This study suggested that open spaces like urban parks were not as sound as was expected and that there was potential for exposure of visitors/workers in the parks to organochlorine pesticides.
Li
Xing-hong
XH
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center of Eco-Environment Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Wang
Wei
W
Wang
Juan
J
Cao
Xue-li
XL
Wang
Xiao-fei
XF
Liu
Jian-chang
JC
Liu
Xiu-fen
XF
Xu
Xiao-bai
XB
Jiang
Xiang-ning
XN
D002681:China; D002947:Cities; D003634:DDT / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D005843:Geography; D001556:Hexachlorocyclohexane / Q000032:analysis*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D011633:Public Facilities; D011998:Recreation; D012989:Soil Pollutants / Q000032:analysis*
D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D012989:Soil Pollutants; D001556:Hexachlorocyclohexane; D003634:DDT