Residues of organochlorine pesticides in Hong Kong soils.
Residues of organochlorine pesticides in Hong Kong soils.
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DOI：
10.1016/j.chemosphere.2005.08.006
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发表时间：
2006-04
期刊：
影响因子：
8.8
通讯作者：
Haibo Zhang;Haibo Zhang;Y. Luo;Y. Luo;Q. Zhao;Q. Zhao;M. Wong;Gan Zhang;Gan Zhang
中科院分区：
文献类型：
--
作者：
Haibo Zhang;Haibo Zhang;Y. Luo;Y. Luo;Q. Zhao;Q. Zhao;M. Wong;Gan Zhang;Gan Zhang
香港土壤中有机氯农药残留的研究较少。在全港五种土地用途的四十六个地点收集了六十六个具代表性的土壤样本。采用气相色谱仪（GC）和镍63电子捕获检测器（μECD）对六氯环己烷（HCH）和7种斯德哥尔摩公约有机氯农药（OCPs）进行了分析。结果表明，香港土壤中均检测到六氯环己烷和5种斯德哥尔摩公约农药，但检出率差异较大。5种有机氯农药的浓度大小顺序为：六六六>滴滴涕>六氯苯>异狄氏剂>α-硫丹。在OCPs及其同系物或异构体中，β-HCH和p，p′-DDE是两种主要的有机氯农药，其在土壤中的平均浓度分别为6.12μgkg− 1和0.41μgkg− 1。从9个土壤剖面中选取0- 10 cm、10- 30 cm和> 30 cm的土层样品，研究DDT和HCH在土壤剖面中的深度分布。在大多数采样点，HCH浓度从表土到底层逐渐增加，而DDT浓度最低通常出现在底土（10- 30厘米）中。此外，pH（KCl）和总有机碳（TOC）与HCH的相关性较好，表明这两种土壤性质对HCH的残留有影响，但与DDT或其他OCPs的相关性不明显。
It was short of research on the organochlorine pesticides (OCPs) residues in the soils of Hong Kong. Sixty-six representative soil samples were collected from the 46 sites covering five types of land uses in Hong Kong. Hexachlorohexanes (HCH) and 7 Stockholm Convention OCPs were analyzed by gas chromatograph (GC) equipped with a Nickel 63 electronic capture detector (μECD). The results presented that HCH and 5 Stockholm Convention pesticides were detected in Hong Kong soils although the detectable ratio varies to a great extent. The concentration sequence of the five detectable OCPs was HCH>dichlorodiphenyltrichloroethane (DDT)>hexachlorobenzene (HCB)≈Endrin>α-endosulfan. Among the OCPs and their homologues or isomers, β-HCH and p,p′-DDE were the two predominant substances according to the concentrations and detectable ratios, concentrations of which in soils were averagely 6.12μgkg−1and 0.41μgkg−1respectively. Soil horizon samples of 0–10cm, 10–30cm and >30cm depth were selected from nine soil profiles to demonstrate the depth distributions of DDT and HCH in soil profiles. Concentrations of HCH tended to increase gradually from the topsoil to bottom layer while the lowest concentration of DDT is usually found in the subsoil (10–30cm) in most sampling sites. In addition, close correlations of pH(KCl) and total organic carbon (TOC) with HCH indicated an effect on the residues of HCH caused by these two soils properties, but such relationships were not found with DDT or other OCPs.