Wang Tie-yu, Tan Bing, Lu Yong-long
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 10085, China.
ScientificWorldJournal. 2012;2012:628216. doi: 10.1100/2012/628216. Epub 2012 Dec 31.
The concentrations of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in the topsoil samples around the Guanting Reservoir in Beijing were measured, and their spatial distribution and environmental risks were analyzed by GIS. The results showed that in 2003, 2007, and 2009, the HCHs concentrations were 0.66, 0.85, and 0.73 ng/g, and the DDTs concentrations were 9.50, 7.80, and 6.46 ng/g in the studied area, respectively. In the topsoil, the HCHs concentrations did not change much while the DDTs concentrations declined steadily. Most of the current residues in soil come from the POPs used in the past years but some new input is also detected in certain regions. The level of HCHs and DDTs residues in the south reservoir is lower than that in the north reservoir. The middle region has the highest HCHs and DDTs concentrations, especially near the Beixinpu town. The high risk regions of pollution of HCHs and DDTs are mainly distributed in the vicinity of Beixinpu town as well. Based on the aforementioned results, a comprehensive countermeasure is proposed entailing decision making, local implementation, scientific support, and public participation with regard to the long-term control and management of POPs around the Guanting Reservoir.
对北京官厅水库周边表层土壤样品中六氯环己烷（HCHs）和滴滴涕（DDTs）的浓度进行了测定，并利用地理信息系统（GIS）分析了它们的空间分布及环境风险。结果表明，2003年、2007年和2009年，研究区域内HCHs浓度分别为0.66、0.85和0.73纳克/克，DDTs浓度分别为9.50、7.80和6.46纳克/克。表层土壤中，HCHs浓度变化不大，而DDTs浓度则稳步下降。目前土壤中的残留大多来自过去几年使用的持久性有机污染物（POPs），但在某些区域也检测到了一些新的输入源。水库南部HCHs和DDTs的残留水平低于水库北部。中部地区HCHs和DDTs浓度最高，尤其是在北辛堡镇附近。HCHs和DDTs污染的高风险区域也主要分布在北辛堡镇附近。基于上述结果，针对官厅水库周边持久性有机污染物的长期控制与管理，提出了一项包括决策制定、地方实施、科学支持和公众参与的综合对策。
