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建立了土壤中两种二苯醚类除草剂对映体的手性液相色谱测定方法。样品用乙腈提取和氯化钠盐析后,上层乙腈经弗罗里硅土固相萃取柱净化后,用手性液相色谱检测。结果表明:两种农药各自对映体的回收率在84.4%—98.3%之间,相对标准偏差在3.2%—12.5%之间。在实际样品中的检出限在0.013—0.016mg/kg之间,定量限在0.043—0.053mg/kg之间。
A method for the determination of two enantiomers of diphenylether herbicides in soil by chiral liquid chromatography was established. After the sample was extracted with acetonitrile and salted with sodium chloride, the upper acetonitrile was purified by Florisil solid-phase extraction column and detected by chiral liquid chromatography. The results showed that the recoveries of the two pesticides were between 84.4% and 98.3%, and the relative standard deviations were between 3.2% and 12.5%. The detection limit in the actual sample was between 0.013-0.016mg / kg and the limit of quantitation was between 0.043-0.053mg / kg.