稻米和土壤样品经水和乙腈混合液提取,氟罗里硅土固相萃取柱净化,经GC-ECD测定,外标法定量,影响本试验的关键为净化过程淋洗液比例的确定,通过摸索,确定淋洗液比例丙酮∶正己烷(V∶V)为20∶80。本方法具有较高的准确度和精密度,添加浓度在0.05～0.20 mg/kg时,平均回收率为92%~115%,RSD为2.5%~5.5%。 Rice and soil samples were extracted by water and acetonitrile mixture and cleaned up by solid-phase extraction with Florisil silica column. The results of GC-ECD and external standard method were quantified. The key factors influencing the test were the determination of elution ratio of the purification process, Groping, to determine the proportion of eluent acetone: n-hexane (V: V) of 20:80. The method has high accuracy and precision. When the concentration is 0.05-0.20 mg / kg, the average recovery is 92% -115% and the RSD is 2.5% -5.5%.