生态环境学报Issue(9)：1547-1553,7.DOI:10.16258/j.cnki.1674-5906.2015.09.019
苏南典型土壤中22种有机氯农药的垂直分布特征
Vertical Distribution Characteristics of 22 Organochlorine Pesticides in Typical Soils from Southern Jiangsu Province
摘要
Abstract
A large number of pesticide and chemical plants have been moved out of southern Jiangsu province for nearly ten years. In order to understand the residue and the environmental behaviors of OCPs in this area, it was the first time to study the distribution characteristics of 22 organochlorine pesticides (OCPs) in shallow soil from some agricultural and industrial areas located in Nanjing, Zhenjiang, Changzhou, Wuxi and Suzhou. 30 samples collected from different depths were extracted using accelerated solvent extraction (ASE) and analyzed by gas chromatography equipment with electron capture detector (ECD). Research results indicated that the topsoil was still the major residual layer for organochlorine pesticide. DDTs and HCHs were the primary pollutants of OCPs in the samples. Concentrations of DDTs and HCHs in topsoils ranged from n.d. to 313.0 ng·g-1 with a mean value of 75.04 ng·g-1 and n.d.~9.25 ng·g-1 with a mean value of 2.82 ng·g-1, respectively. p,p′-DDD and p,p′-DDE were found to be the major components of DDTs, andβ-HCH were found to be the major components of HCHs. In addition, HCB, Aldrin, Heptachlor, Dieldrin, Endosulfan sulfate were also detected in varying degrees. Concentrations of OCPs varied according to the different land use patterns. The highest residues of DDTs were found in the industrial area, while HCHs were the prominent OCPs in agricultural areas. The mean concentrations of OCPs were in the order:industrial areas (127.2 ng·g-1)>agricultural areas (30.75 ng·g-1). Due to the influence of anthropogenic activities, concentrations of OCPs, DDTs and HCHs in most sampling sites tended to decrease gradually from topsoil to bottom layer, while there were some slight fluctuations in decreasing process in some sampling sites. Compared with the undetectable levels of γ-HCH, only a few α-HCH had been found in soil samples, indicating that there was no recent input of Lindane and HCHs. The value of (p,p′-DDD+ p,p′-DDE)/DDTs indicates that there was less contamination input from the new contamination recently in this area. The results provide some references for the vertical profile of OCPs in this region.关键词
有机氯农药/残留/垂直分布/土壤Key words
organochlorine pesticides/residue/vertical distribution/soil分类
资源环境引用本文复制引用
时磊,孙艳艳,吕爱娟,蔡小虎,沈小明,沈加林..苏南典型土壤中22种有机氯农药的垂直分布特征[J].生态环境学报,2015,(9):1547-1553,7.基金项目
中国地质调查局地质调查工作项目 （）
