二甲戊乐灵在溪黄草及土壤中的残留分析方法研究

Study on Residue Analysis Method of Pendimethalin in Rabdosia lophanthoides Hara and Soil

本文对溪黄草样品采用丙酮-正己烷提取,活性炭-中性氧化铝柱净化,石油醚-丙酮淋洗前处理;土壤样品经乙腈提取等步骤前处理,建立了溪黄草及土壤中二甲戊乐灵残留的气相色谱-电子捕获检测器（GC-ECD）的分析方法。结果表明：二甲戊乐灵的最小检出量为0.1ng,其在溪黄草和土壤中的最低检测浓度均为0.01mg/kg,在溪黄草中的平均回收率为88.53%～90.45%,相对标准偏差（RSD）为1.33%～2.76%;在土壤中的平均回收率为93.94%～96.23%,RSD为4.67%～4.80%,二甲戊乐灵在0.01～2mg/L范围内具有良好的线性关系。

A method has been developed for the determination of pendimethalin by gas chromatography with an electrical conductivity detector（GC-ECD）.The results showed that the limit of detection of pendimethalin was 0.1ng,meanwhile,the minimum detectable concentration was 0.01 mg/kg in both Rabdosia lophanthoides Hara and soil.The fortified recoveries of pendimethalin were 88.53%-90.45% and 93.94%-96.23% in Rabdosia lophanthoides Haraand soil,with relative standard deviations（RSDs）of 1.33%-2.76% and 4.67%-4.80% respectively.There was a good linear relationship in the range of 0.01-2.0mg/L for pendimethalin.