Zhang H B, Luo Y M, Zhao Q G, Wong M H, Zhang G L
Soil and Environment Joint Open Laboratory between Institute of Soil Science, Chinese Academy of Sciences and Hong Kong Baptist University, State Key Laboratory of Soil and Sustainable Agriculture, 71 East Beijing Road, Nanjing, Jiangsu 210008, China.
Chemosphere. 2006 Apr;63(4):633-41. doi: 10.1016/j.chemosphere.2005.08.006. Epub 2005 Dec 5.
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 (muECD). 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) approximately = Endrin > alpha-endosulfan. Among the OCPs and their homologues or isomers, beta-HCH and p,p'-DDE were the two predominant substances according to the concentrations and detectable ratios, concentrations of which in soils were averagely 6.12 microg kg(-1) and 0.41 microg kg(-1) respectively. Soil horizon samples of 0-10 cm, 10-30 cm and >30 cm 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 (10-30 cm) 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.
此前针对香港土壤中有机氯农药（OCPs）残留的研究较少。从香港涵盖五种土地利用类型的46个地点采集了66个具有代表性的土壤样本。采用配备镍63电子捕获检测器（μECD）的气相色谱仪（GC）对六氯己烷（HCH）和7种《斯德哥尔摩公约》规定的有机氯农药进行分析。结果表明，尽管检出率差异很大，但在香港土壤中检测到了六氯己烷和5种《斯德哥尔摩公约》规定的农药。5种可检出的有机氯农药的浓度顺序为：六氯己烷＞二氯二苯三氯乙烷（DDT）＞六氯苯（HCB）≈异狄氏剂＞α-硫丹。在这些有机氯农药及其同系物或异构体中，β-六氯己烷和p,p'-滴滴伊是根据浓度和检出率确定的两种主要物质，其在土壤中的浓度分别平均为6.12 μg kg-1和0.41 μg kg-1。从9个土壤剖面中选取了深度为0-10 cm、10-30 cm和＞30 cm的土壤层样本，以展示土壤剖面中滴滴涕和六氯己烷的深度分布情况。六氯己烷的浓度从上壤层到下层往往逐渐增加，而在大多数采样点，滴滴涕的最低浓度通常出现在亚表层土壤（10-30 cm）中。此外，pH（KCl）和总有机碳（TOC）与六氯己烷之间存在密切相关性，表明这两种土壤性质对六氯己烷残留有影响，但滴滴涕或其他有机氯农药未发现这种关系。
