Temporal variations of organochlorine pesticides in precipitation in Beijing, China
Temporal variations of organochlorine pesticides in precipitation in Beijing, China
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DOI：
10.1016/j.atmosenv.2012.08.026
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发表时间：
2012-12
影响因子：
5
通讯作者：
Guosheng Yang;Lingling Ma;Dian-dou Xu;Li-Yan Liu;Hongliang Jia;Yang Chen;Yongbao Zhang;Z. Chai
中科院分区：
文献类型：
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作者：
Guosheng Yang;Lingling Ma;Dian-dou Xu;Li-Yan Liu;Hongliang Jia;Yang Chen;Yongbao Zhang;Z. Chai
分析了2009年2月至2011年3月北京市降水中有机氯农药（OCPs）的时空变化特征，并计算了各月的沉积通量。最常检测到的化合物包括α-HCH和β-HCH，六氯环己烷（HCHs）的体积加权平均浓度为33.0 ng L−1，占降水中∑OCPs的72.3%。溶解相和颗粒相的有机氯农药总浓度分别为3.73至152 ng L−1（平均值：29.7 ± 3.5 ng L−1）和1.61至114 ng L−1（平均值：15.9 ± 2.0 ng L−1）。溶解相中的有机氯农药在降水中的采样浓度中占主导地位（六氯环己烷：71.8%，三氯甲烷：77.7%，二氯二苯三氯乙烷-滴滴涕：50.1%），但六氯苯（26.3%）除外。此外，分配系数，Kpd，一般在低温，特别是在春季大。降水中∑OCPs的丰度呈逐月波动，冬末和春季最高。采样时采样点附近的过去农田正在建设中，这可能是本研究中重要的本地再排放源。在北京，11种OCPs的湿沉降通量为14.9 μg m− 2 yr − 1。
Temporal variations of organochlorine pesticides (OCPs) were determined in precipitation and monthly depositional fluxes were calculated in Beijing from February 2009 to March 2011. Compounds which were detected most often included α-HCH and β-HCH, and the volume-weighted mean (VWM) concentration of hexachlorocyclohexanes (HCHs) was 33.0 ng L−1, accounting for 72.3% of the ∑OCPs in precipitation. The total concentrations of OCPs ranged from 3.73 to 152 ng L−1(mean: 29.7 ± 3.5 ng L−1) for dissolved phase and from 1.61 to 114 ng L−1(mean: 15.9 ± 2.0 ng L−1) for particulate phase, respectively. OCPs in dissolved phase dominated sampled concentrations in precipitation (HCHs: 71.8%, Chlordane: 77.7%, dichlorodiphenyltrichloroethanes-DDTs: 50.1%) with an exception of hexachlorobenzene–HCB (26.3%). Furthermore, the distribution coefficient, Kpd, was generally large in low temperature, especially in spring. The abundance of ∑OCPs in the precipitation fluctuated monthly, with high value in late winter and spring. The past farmland near the sampling site was under construction during sampling, which may be an important local re-emission source in this study. The elevated wet deposition flux of 11 selected OCPs was 14.9 μg m−2yr−1in Beijing.