title: [Residual characteristics of HCHs in soils of a former lindane production enterprise].
abstract: In order to study the soil pollution status of the fields left by organochlorine pesticide manufacturing enterprises, soils from a former lindane production enterprise of Xinxiang were investigated in November, 2010. A soxhlet extraction-gas chromatography-electron capture detector (SE-GC-ECD) method was used to detect the HCH residues in the contaminated soil samples. Results showed that the detection rate of the four HCHs isomers in each sampling site was 100%. In the 0-20 cm topsoil, concentrations of HCH residues (Sig;ma HCH ) changed with volatility, ranging from 0.0343 to 19.5608 mg.kg-1. In the soil layer at 0-80 cm depth and around the center point, concentrations of HCH residues (Sigma HCH ) first increased and then reduced while the soil depth increased, varying from 0.031 3 to 0.2947 mg.kg-1. Analysis of HCH composition showed that concentrations of the four isomers were in the order of beta-HCH > delta-HCH > alpha-HCH > alpha-HCH. The average percentage of p-HCH isomer was approximately 50%, which was obviously higher than those of the other isomers, indicating that there was no recent input of HCH. The results showed that over the recent decades, the HCH level in most of the soil samples (67.9%) were below the residue criterion of 0.5 mg.kg-1 of the China Soil Environmental Quality Standard (GB 15618-1995), indicating that they were safe. However, soil samples in western and eastern parts of backyard near the production plant were still seriously contaminated, the HCH concentrations in which were 1.5-20 times higher than the residue criterion of 1.0 mg.kg-1 of the China Soil Environmental Quality Standard, causing great potential safety hazard to human and environment.
authors.affiliation: Key Laboratory for Yellow River and Huaihe River Water Environmental and Pollution Control, Ministry of Education, School of Environment, Henan Normal University, Xinxiang 453007, China. fengpan@htu.cn
authors.forename: Feng
authors.initials: F
authors.lastname: Pan
authors.forename: Li-Li
authors.initials: LL
authors.lastname: Wang
authors.forename: Hao
authors.initials: H
authors.lastname: Zhao
authors.forename: Qi-Zhong
authors.initials: QZ
authors.lastname: You
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
mesh_terms: D002617:Chemical Industry; D002681:China; D004784:Environmental Monitoring; D001556:Hexachlorocyclohexane / Q000032:analysis*; D007306:Insecticides / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D007306:Insecticides; D010573:Pesticide Residues; D012989:Soil Pollutants; D001556:Hexachlorocyclohexane