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建立了采用QuEChERS-气相色谱快速检测苎麻及其土壤中8种有机磷农药残留的方法。样品用乙腈或乙腈-超纯水提取,苎麻叶样品用N-丙基乙二胺(PSA)配合石墨化炭黑(GCB)净化,土壤和苎麻杆样品经PSA净化,最后用丙酮置换乙腈,气相色谱-FPD检测,外标法定量。结果表明,在0.05～0.5 mg/kg添加水平范围内,8种农药在土壤、苎麻杆和苎麻叶样品中的平均添加回收率在71.1%～114.2%之间,相对标准偏差(RSD)为2.2%～14.6%,检出限(LOD)在0.006～0.016 mg/kg之间,定量限(LOQ)在0.020～0.050 mg/kg之间。该方法准确、快速、方便,适用于有机磷类农药在苎麻叶、苎麻杆和土壤中的残留检测。
A rapid method for the determination of 8 organophosphorus pesticide residues in ramie and its soil by QuEChERS-GC has been established. The samples were extracted with acetonitrile or acetonitrile-ultrapure water. The ramie leaves were cleaned with N-propyl ethylenediamine (PSA) and graphitized carbon black (GCB). The soil and ramie rod samples were purified with PSA. Acetonitrile was used to replace acetonitrile. Gas chromatography-FPD detection, external standard quantitative. The results showed that in the range of 0.05-0.5 mg / kg, the average recoveries of eight pesticides in soil, ramie rod and ramie leaf samples ranged from 71.1% to 114.2%, and the relative standard deviations (RSDs) were 2.2 % ~ 14.6%. The limit of detection (LOD) was between 0.006 ~ 0.016 mg / kg and the limit of quantification (LOQ) was between 0.020 ~ 0.050 mg / kg. The method is accurate, rapid and convenient for the detection of residues of organophosphate pesticides in ramie leaves, ramie stems and soils.