GC-ECD测定江永香姜中有机氯农药残留

Determination of Organochlorine Pesticides Residues in Jiangyong Ginger by GC-ECD

[目的]建立气相色谱-电子捕获检测器检测(GC-ECD)江永香姜中有机氯农药残留的分析方法。[方法]样品经正己烷-丙酮(4∶1,V/V)超声提取,过滤、盐析、干燥,经弗洛里硅土柱净化,用丙酮+正己烷(1∶9,V/V)洗脱,GC-ECD检测。[结果]8种有机氯农药的检出限0.028~0.500μg/kg,加标回收率96.4%~100.2%,相对标准偏差RSD 1.3%~3.5%,符合国家标准要求。[结论]该方法具有操作简单、准确、快速、灵敏、净化效果好等特点,适合江永香姜中有机氯农药残留的测定。

[Objective]The gas chromatograph-electron capture detector( GC-ECD) was established to test organochlorine pesticides residues in Jiangyong ginger.[Method]The pesticides were ultrasonic extracted with N-hexane-acetone( 4∶ 1,V/V),filtration,salting out,dry,and then it was purified by florida silica column and was eluted with acetone and n-hexane( 1∶ 9,V/V). Afterwards GC-ECD was used to determine organochlorine pesticides.[Result]The limits of detection for 8 organochlorine pesticides were 0. 028 ~ 0. 500 μg/kg,and the recoveries were 96. 4% ~100. 2%. The relative standard deviations( RSD) were 1. 3% ~ 3. 5%. The resulted accord with national standard. [Conclusion]The resulted showed that this method has simple operation,rapid,good sensitivity,reproducibility and high efficiency,which could be applied to the quantitative for organochlorine pesticides residues in ginger.