灭草松在小麦和土壤中的残留分析方法

STUDY ON RESIDUAL ANALYSIS METHOD OF BENTAZONE IN WHIEAT GRATINS AND SOILS

确立了灭草松在小麦和土壤中的残留量的气相色谱分析方法。小麦样本用甲醇提取后，用乙腈和正己烷分配。土壤样本用１０％碘甲烷、二氯甲烷提取后，萃取到二氯甲烷中柱净化后，七氟西酸酐衍生，用气相色谱电子俘获检测器检测。本方法对灭草松在小麦和土壤的平均回收率为８０％～１００％，变异系数为３．８％～１７．８％，在小麦中最低检出浓度为０．０１ｍｇ／ｋｇ，在土壤中最低检出浓度为０．００５ｍｇ／ｋｇ。

The gas-chromaographic analysis of Bentazone residues in wheat grains and soils was conducted in this study. The wheat grain samples were extracted by methanol, and then the extract was partitioned between acetonitrile and hexane. The soil samples were extracted by 10% iodomethane in dichloromethane,The extract was trandferred into dichlormethane,purified by column,and finally derived by heptaflurobutyric anhydride,The heptafluorobutyric derivative was detected by GC-ECD. The average recovery was in the range 95% to 100%; the corrsponding variation coefficient was in the range 5.6% to 7.9% for both wheat grain and soil samplex .The detection limits of concentration were 0.01 and 0.005mg/kg for wheat grains and soil, respectively.