Distribution and sources of DDTs in urban soils with six types of land use in Beijing, China.
Distribution and sources of DDTs in urban soils with six types of land use in Beijing, China.
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DOI：
10.1016/j.jhazmat.2009.09.022
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发表时间：
2010-02
影响因子：
13.6
通讯作者：
Lingyan Yang;X. Xia;Shaoda Liu;Qingwei Bu
中科院分区：
文献类型：
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作者：
Lingyan Yang;X. Xia;Shaoda Liu;Qingwei Bu
对北京市商业区、古典园林、文教区、大型公共绿色空间、居住区和道路两侧的土壤样品中DDTs的含量进行了调查。DDTs浓度范围为0.03 ~ 1282.58ng/g，平均值为68.14±189.46ng/g。结果表明，在不同土地利用类型中，DDT的含量均高于其他5种土地利用类型，这是由于DDT在不同土地利用类型中用于保护植被，且DDT的含量受DDTs使用历史和土地利用年限的影响。只有22%的样品，主要位于RO，最近表现出技术滴滴涕的应用。DDTs浓度从市中心向郊区呈下降趋势，且随着城区年龄的增长而增加。DDTs与土壤总有机碳和黑碳呈正相关。其中81.7%的样品符合《土壤环境质量标准》中的一级标准（50 ng/g土），只有1.5%的样品超过三级标准（1000 ng/g土）。
The concentrations of dichlorodiphenyltrichloroethanes (DDTs) were investigated for urban soil samples collected from business area (BU), classical garden (CL), culture and educational area (CU), large public green space (LA), residential area (RE), and roadside area (RO) in Beijing. The DDTs concentrations ranged from 0.03 to 1282.58ng/g, with an average of 68.14±189.46ng/g. The DDTs concentration in CL was much higher than that in the other five types of land use, which was due to the usage of DDTs to protect vegetation in CL, and the DDTs concentration was affected by both the usage history of DDTs and the age of the CL. Only 22% of the samples, mainly located in RO, manifested the application of technical DDTs recently. DDTs concentration showed a decreasing trend from the city center to the suburb, and it increased with the age of the urban area. DDTs were positively correlated with total organic carbon and black carbon in soils. About 81.7% of the samples met the grade I standard (50ng/g soil) of the Chinese Environmental Quality Standard for Soils, and only 1.5% of the samples exceeded the grade III standard (1000ng/g soil).