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建立了一种稻田土壤、糙米和秸秆中灭草松残留量的QuEChERS-HPLC检测方法。以乙腈为提取溶剂,N-丙基-乙二胺(PSA)为吸附剂,实现样品快速制备;在C18色谱柱上,以甲醇-0.2‰H3PO4(55/45,V/V)为流动相,紫外检测器于215nm波长处检测,在0.1～5.0 mg/L范围内浓度与峰面积呈良好的线性关系,相关系数为0.9991。在添加浓度为0.05～1.0 mg/kg范围内的平均回收率为88.6%～96.8%,相对标准偏差为1.1%～2.7%,检出限为5.5×10-11g。方法能够满足水稻田土壤、糙米和秸秆样品中灭草松的残留检测。
A QuEChERS-HPLC method for the determination of mefenpyrate residues in paddy soils, brown rice and straw was established. The sample was prepared quickly by using acetonitrile as the extraction solvent and N-propyl-ethylenediamine (PSA) as the adsorbent. The mobile phase was methanol -0.2 ‰ H3PO4 (55/45, V / V) , UV detector at 215nm wavelength detection, in the range of 0.1 ~ 5.0 mg / L concentration and peak area showed a good linear relationship, the correlation coefficient of 0.9991. The average recoveries ranged from 88.6% to 96.8% with relative standard deviations from 1.1% to 2.7% with a detection limit of 5.5 × 10-11g at the concentration of 0.05-1.0 mg / kg. The method can meet the residual detection of imazapyr in paddy soil, brown rice and straw samples.