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[目的]研究乙氧氟草醚、二甲戊乐灵和乙草胺在大蒜植株和土壤中的残留分析方法。[方法]样品经过丙酮和水混合溶液提取后,用中性氧化铝和活性炭净化,气相色谱测定。[结果]乙氧氟草醚、二甲戊乐灵、乙草胺的最小检出量分别为3.0×10-12、2.0×10-12和1.5×10-12 g,最低检测质量分数分别为6×10-4、4×10-4和3×10-4 mg/kg。乙草胺在土壤、植株中的平均回收率分别为83.9%～118.1%、87.6%～117.6%,变异系数分别为5.4%～14.3%、1.6%～9.0%,乙氧氟草醚在土壤、植株中的平均回收率分别为93.4%～109.3%、75.7%～117.2%,变异系数分别为2.5%～5.4%、2.7%～13.2%,二甲戊乐灵在土壤、植株中的平均回收率分别为78.9%～106.8%8、0.7%～118.9%,变异系数分别为2.8%～5.9%4、.7%～15.8%。[结论]该方法操作简便,检测结果准确可靠,前处理重复性好,速度快,可用于大蒜实际样品的日常检测。
[Objective] The research aimed to study the residual analysis method of oxyfluorfen, pendimethalin and acetochlor in garlic plant and soil. [Method] After the sample was extracted with acetone and water, the sample was purified by neutral alumina and activated carbon and determined by gas chromatography. [Results] The minimum detectable concentrations of oxyfluorfen, pendimethalin and acetochlor were 3.0 × 10-12, 2.0 × 10-12 and 1.5 × 10-12 g, respectively. The minimum detectable concentrations of oxyfluorfen, pendimethalin and acetochlor were 6 × 10 -4, 4 × 10 -4, and 3 × 10 -4 mg / kg. The average recoveries of acetochlor in soils and plants ranged from 83.9% to 118.1% and 87.6% to 117.6%, and the coefficients of variation were 5.4% to 14.3% and 1.6% to 9.0%, respectively. The average recoveries of pendimethalin in soil and plant were 93.4% -109.3% and 75.7% -117.2%, respectively, and the coefficients of variation were 2.5% -5.4% and 2.7% -13.2% Respectively, ranging from 78.9% -106.8% 8,0.7% -118.9%. The coefficients of variation were 2.8% -5.9% 4, .7% -15.8%, respectively. [Conclusion] The method was simple, accurate and reliable, the repeatability of the pretreatment was good and the speed was fast. It could be used for routine testing of real samples of garlic.