摘要
土壤是农药的主要载体,有机氯农药具有高毒、难降解、蓄积性等特性,其残留会通过各种方式进行持续累积、扩散,从而对农产品造成残留,为了保障土地使用安全、粮食安全,采用气相色谱法检测土壤样品中有机氯农药(α-六六六、β-六六六、γ-六六六、δ-六六六、O,P’-DDT、P,P’-DDE、P,P’-DDT、P,P’-DDD、百菌清、环氧七氯)的残留量,对土壤样品的前处理方法进行了优化。土壤样品用乙腈振荡提取,在旋转蒸发仪上在水浴温度为40℃下旋转浓缩至约2 mL左右,取出后在氮吹仪上吹至近干,在优化的气相色谱条件下对土壤样品进行检测。结果表明,实际土壤样品均未检出,在0.2、0.4、0.6 ug/mL添加水平下,加标回收率为71.2%~121.2%,相对标准偏差为1.2%~12.3%,方法检出限为0.28~0.95μg/kg。
Soil is the main media of pesticides. Organochlorine pesticides possess the characters of high toxicity, degradation difficuly and accumulation, the pesticide residues would continue to accumulate and spread through various ways, resulting in residues in agricultural products. In order toensure food safety and the safety of land use, the residual levels of 10 organochlorine pesticides(α-6666, β-6666, γ-6666, δ-6666, O, P’-DDT, P, P’-DDE, P, P’-DDT, P, P’-DDD, chlorothalonil and heptachloride)in soil samples were determined by gas chromatography. Pre-treatment methodof the soil samples was optimized, the soil samples were extracted with acetonitrile by oscillation and concentrated to about 2 mL with water bath temperature of 40 ℃ on a rotary evaporator. After extraction, the soil samples were blown to nearly dry on a nitrogen blower. The soil samples were then detected under optimized gas chromatography conditions. Results showed that pesticide residues in soil sampes of this study were not detected, at the added levels of 0.2 ug/L, 0.4 ug/L and 0.6 ug/mL, sample recovery rates were between 71.2% to 121.2%, relative standard deviations were between 1.2% to 12.3%, and the method detection limits were between 0.28 to 0.95 μg/kg.
作者
许延霞
瞿士鹏
王琴
梅兴天
XU Yanxia;QU Shipeng;WANG Qin;MEI Xingtian(Ecological Environment Monitoring Centre of Jinchang,Gansu Province,Jinchang Gansu 737100,China)
出处
《甘肃农业科技》
2022年第7期64-69,共6页
Gansu Agricultural Science and Technology
关键词
气相色谱
土壤
有机氯农药
优化
Gas chromatography
Soil
Organochlorine pesticide
Optimization
