Determination of Glyphosate Residues in Soil Samples by Ion Chromatography Combined with Magnetic Solid Phase Extraction
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KeyWord:ion chromatography  magnetic solid phase extraction  glyphosate  soil samples
YANG Jian,LI Zhen-yu,ZHU Yan,YANG De-zhi,YANG Ya-ling 1.昆明市环境监测中心;2.昆明理工大学生命科学与技术学院
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      Combined with magnetic solid phase extraction,a simple and rapid ion chromatographic method was established for the detection of glyphosate residues in soil samples.Experimental conditions such as extraction solvent,conditions of ion chromatography and purification material were also optimized.After extracted with water,the samples were precipitated with acetonitrile to eliminate the impurities,then purifed with Fe3O4 magnetic nanoparticles.The supernatant was separated on an IonPac AS11-HC column with 30 mmol/L KOH as the eluent,and a conductivity detector was used for the detection.Results showed that a good linearity was obtained in the range of 0.05-2.0 mg/L(r2 =0.999 7).The limits of detection and quantitation for the analyte were 13 μg/L and 45 μg/L,respectively.The recoveries for the soil samples at spiked levels of 50,100 and 200 μg/L were between 83.2% and 94.5%,with the intra-day and inter-day RSDs of 1.9%-3.1% and 1.9%-3.7%,respectively.The method is simple,rapid,sensitive and reliable,and could fully meet the detection requirements in the national standard.