气相色谱法测定土壤中37种有机磷农药残留

采用气相色谱法测定土壤中37种有机磷农药,当取样量为10 g时,37种有机磷农药方法检出限为0. 002～0. 015 mg/kg,测定下限为0. 008～0. 060 mg/kg。低含量加标样品中有机磷农药的加标回收率为72. 8%～104%,相对标准偏差为4. 2%～13. 8%;中含量加标样品中有机磷农药的加标回收率为71. 5%～101%,相对标准偏差为4. 3%～13. 5%;高含量加标样品中有机磷农药的加标回收率为74. 6%～109%,相对标准偏差为6. 8%～14. 6%。该方法灵敏度高、分离效果好、重现性好,能够满足土壤中37种有机磷农药残留检测的要求。

Detection of 37 Kinds of Organophosphorus Pesticides Residues in Soils by Gas Chromatography

Organophosphorus pesticides in soils were detected by gas chromatography. When the sample quantity was 10 g, the detection limits of organophosphorus pesticides were within the range of 0.002 to 0.015 mg/kg, the lower detection limits of organophosphorus pesticides were within the range of 0.008 to 0.060 mg/kg . The recoveries of low concentration sample of organophosphorus pesticides ranged from 72.8% to 104%, the relative standard deviations were in the range of 4.2% to 13.8%. The recoveries of medium concentration samples of organophosphorus pesticides were in the range of 71.5% to 101%, the relative standard deviations were between the range of 4.3% to 13.5%. The recoveries of high concentration samples of organophosphorus pesticides were in the range of 74.6% to 109%, the relative standard deviations were in the range of 6.8% to 14.6%. The method shows high sensitivity, good separation effect and good reproducibility, it satisfies the requirement of detecting 37 organophosphorus pesticide residues in soil.