离子色谱法测定茶园土壤中草甘膦残留量
目的 建立简便快捷测定茶园土壤草甘膦残留量的离子色谱分析方法。方法 土壤样品采用5 mg/L Na2S2O3超声提取30 min, 提取液经净化后, 采用流速为1.0 mL/min、进样量25 ?L、抑制器电流87 mA、 20 mmol/L KOH淋洗液、AS19分析柱, 抑制型电导检测。结果 草甘膦在0.05~3.0 mg/L范围内线性关系良好, 相关系数r为0.9996, 检出限为0.016 mg/kg。在低、中、高3种加标水平下, 平均回收率分别为90.4%、96.8%和97.8%, 重复测定相对标准偏差(RSD)分别为5.73%、7.74%和3.87%。结论 该方法操作简单无需衍生, 线性良好, 可以准确地测定茶园土壤中草甘膦残留量。
Objective To establish a simple and rapid ion chromatography analysis method for the determination of glyphosate residues in tea garden soil. Methods The soil samples were extracted with 5 mg/L Na2S2O3 for 30 min. After purification, the flow rate was 1.0 mL/min, injection volume was 25 ?L, inhibitor current was 87 mA, 20 mmol/L KOH eluent, AS19 analytical column and inhibitory conductance detection was used. Results Glyphosate had a good linear relationship in the range of 0.05–3.0 mg/L, the correlation coefficient r was 0.9996, and the detection limit was 0.016 mg/kg. The average recoveries of glyphosate were 90.4%, 96.8% and 97.8%, respectively, and the RSD% of repeated determination were 5.73%, 7.74% and 3.87%, respectively. Conclusion The method is simple to operate, does not need derivation, has good linearity, and can accurately determine glyphosate residues in tea garden soil.
标题：离子色谱法测定茶园土壤中草甘膦残留量
英文标题：Determination of glyphosate residues in tea plantation soil by ion chromatography
作者：
刘新月 国家普洱茶产品质量监督检验中心
伍旭东 国家普洱茶产品质量监督检验中心
蒲泓君 国家普洱茶产品质量监督检验中心
车涛 国家普洱茶产品质量监督检验中心
张晓花 国家普洱茶产品质量监督检验中心
杨俊波 国家普洱茶产品质量监督检验中心
中文关键词:离子色谱法,草甘膦,残留量,茶园土壤,
英文关键词:ion-chromatography,glyphosate,pesticide residues,tealand soil,
发表日期：2020-04-16
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