【摘要】 采用气相色谱对福建闽西北地区水稻土中有机氯农药(HCHS、DDTS)残留量进行了测定,探讨其残留特征。结果表明:调查区土壤中HCHS和DDTS残留量分别为0.41~9.61μg/kg和6.51~469.50μg/kg,土壤HCHS残留量均低于土壤环境质量标准(GB15618—1995)的一级标准限量值(50μg/kg),但有23.1%的样点土壤OCPS残留总量高于50μg/kg。OCPS主要残留物是DDTS。土壤中HCHS异构体的残留特征是β-HCH>r-HCH>α-HCH>δ-HCH,其中HCHS以β-HCH残留最高;土壤DDTS残留特征是pp’-DDT>op’-DDT>pp’-DDD>pp’-DDE,土壤DDT残留以pp’-DDT为主,且pp’-DDT/(DDD+DDE)大于1,说明DDTS可能有新的污染输入。更多还原

【Abstract】 The residue characteristics of organochlorine pesticides (OCPS) were studied under the soil of rice. In the study, hexachlorocyclohexane (HCH S ) and dichlorodiphenyl trichloroethane (DDT S ) were analyzed using gas chromatography equipped with ECD detector. The results showed that HCH S and DDT S were found widely in all samples and with a range of 0.41-9.6 1μg/kg and 6.51-469.50 μg/kg respectively. The content of HCH S was much lower than the soil environmental quality standard (GB 15618-1995), and it limits the quantity being worth 50 μg/kg, but 76.9% of samples had a total DDT S residue of less than 50 μg/kg. And the DDT S , which was the main components in residues of organochlorine pesticides, took over 96.2% of the total. The residual characteristics of HCH S isomers in the soil was β-HCH>γ-HCH>α-HCH>δ-HCH, β-HCH concentration was higher than other HCH S isomers. The residual characteristics of DDT S isomers in the soil was pp ’ -DDT> op ’ -DDT>pp ’ -DDE>pp ’ -DDD, and the pp ’ -DDT was the main components in residues of DDT S , pp ’ -DDT/ (DDD + DDE) value in soil was greater than one, this suggested that the new DDT S were input in the soil of rice.更多还原