流动注射在线预富集—离子色谱法同时测定饮用水中痕量I-、SCN-、ClO4-及草甘膦

韩晓

（咸阳市疾病预防控制中心，陕西 咸阳，712000）

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摘要：

目的 建立了一种以活性碳纤维为吸附剂，采用流动注射在线预富集—离子色谱法测定饮用水中I-、SCN-、ClO4-及草甘 膦含量的方法。方法 采用圆柱型吸附柱现场采样分析技术实现了连续现场富集水样中痕量的I-、SCN-、ClO4-和草甘膦，并采 用流动注射—离子色谱（FIA-IC）联用技术对吸附柱中富集的I-、SCN-、ClO4-和草甘膦的含量进行测定。采用Ion Pac AS19（250 mm×4 mm）色谱柱分离，KOH 梯度淋洗，流速1.0 mL/min，抑制电导检测，外标法定量。结果 I-、SCN-、ClO4-和草甘膦的线 性范围为2.0～100.0 μg/L，相关系数分别为0.9997、0.9998、0.9998 和0.9999；以信噪比S/N=3 计算检出限，I-、SCN-、ClO4-和草 甘膦的检出限为0.21～0.42 μg/L；样品加标回收率为94.9%～99.6%。结论 该方法用于饮用水的分析，灵敏度较常规离子色谱 提高了40 倍，适用于饮用水中痕量I-、SCN-、ClO4-和草甘膦的测定，结果准确、可靠。

关键词：流动注射—离子色谱法；在线预富集；碘离子；硫氰根离子；高氯酸根离子；草甘膦；饮用水

中图分类号：R123.1文献标志码：A文章编号：2096-1413(2018)01-0004-04

Simultaneous determinatian of I-、SCN-、ClO4- and glyphosate in drinking water by flow injection on-line preconcentration and ion chromatography
HAN Xiao
(Xianyang City Center for Disease Control and Prevention, Xianyang 712000, China)

ABSTRACT: Objective To establish a method for the simultaneous determination of I- , SCN- , ClO4 - and glyphosate in drinking water by flow injection on-line preconcentration and ion chromatography with active carbon fiber as the adsorbent. Methods The trace of I-, SCN-, ClO4- and glyphosate in drinking water were continuously on-line enriched by cylindrical adsorption column field sampling analysis technique; then the contents of I-, SCN-, ClO4- and glyphosate enriched in ad- sorption columns were determined by the flow injection-ion chromatography (FIA-IC) multiple techniques. The chromato- graphic column Ion Pac AS19 (250 mm×4 mm) was used to separate with gradient elution of KOH solution at a flow rate of 1.0 mL/min. The detection was performed by a suppressed conductive detector. The external standard calibration curve was used for the quantitative analysis. Results The linear range of the method for trace I-, SCN-, ClO4- and glyphosate was 2.0～ 100.0 μg/L, and the correlation coefficients were 0.9997, 0.9998 , 0.9998 and 0.9999 respectively; the detection limit was calculated of noise-signal ratio (S/N=3), and the detection limits of I-, SCN-, ClO4- and glyphosate were 0.21～0.42 μg/L; the average recoveries of sample addition was 94.9%～99.6%. Conclusion The sensitivity of the method in the determina- tion of the trace I-, SCN-, ClO4- and glyphosate in drinking water increased by 40 times than that of the conventional ion chromatography, and the result is accurate and reliable.
KEYWORDS: FIA-IC; on-line preconcentration; I-; SCN-; ClO4- ; glyphosate; drinking water

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