我国某工业场地有机氯残留调研

Investigation of OCPs in soil from sodium pentachlorophenate production enterprise

为了解五氯酚钠生产企业搬迁遗留场地土壤中有机氯农药的污染状况,2012年11月采集天津市某五氯酚钠生产企业搬迁遗留场地土壤样品,采用加速溶剂提取-气相色谱-质谱(ASE-GC-MS)法进行分析检测。在所有采样点位中,不仅检出六氯苯,还检出HCH的4种异构体;0~20 cm垂向土壤中六氯苯和ΣHCH的浓度随土壤深度的增加呈现减小的趋势;场地周边100 m范围的土壤中六氯苯和ΣHCH的含量水平虽整体上低于场地内,但污染水平也较高,超过GB 15618——1995《土壤环境质量标准》三级标准限值。工业场地污染状况与场地的生产历史和产品生产工艺密切相关,且场地一定深度和周边一定距离内有机氯农药污染较严重,其风险值得长期关注。

In the past few decades, large amounts of organochlorine pesticides( OCPs) were produced and used in China. The abandoned OCPs production sites have become high-risk areas where the contamination conditions of HCH and DDT have been investigated. But these studies only concern the pollution of sodium pentachlorophenate production enterprises. In November 2012, we analyzed the soil samples collected from the original location of a sodium pentachlorophenate manufacturer in Tianjin. The method namely accelerated solvent extraction-gas chromatography-mass spectrometry( ASE-GC-MS) was used to analyze the OCPs residues in the contaminated soil samples. HCB and HCHs have been discovered at each sampling site. In the soil layer as deep as 0-20 cm and around the source of pollution, the concentration of HCB and HCHs residues varies with the depth of the soil. In the soil within 100 meters from the manufacturing facility, the content of HCB and HCH residues is still high though it is lower compared with the factory area. The pollution state of industrial sites is closely associated with production history and technology. It is noteworthy that the soil in certain depths and within certain distances has been seriously contaminated by OCPs residues.