化学分析计量CHEMICAL ANALYSIS AND METERAGE第29卷，第2期2020年3月Vol. 29，No. 2Mar. 202023
doi：10.3969／j.issn.1008–6145.2020.02.005
离子色谱法同时测定大气降水中7种阴离子
薛伟锋1，李莉2，曹文军3，刘明3
(1.大连出入境检验检疫局检验检疫技术中心，辽宁大连 116600； 2.大连市检验检测认证技术服务中心，辽宁大连 116600；3.中检(大连)测试技术有限公司，辽宁大连 116600)
摘要 建立离子色谱法同时测定大气降水中F–，Cl–，NO2–，Br–，NO3–，SO42–和PO43–7种阴离子的分析方法。选用IonPac®AS19型色谱柱(4 mm×250 mm)，以KOH梯度淋洗，用抑制电导检测器进行测定。7种阴离子在各自的质量浓度范围内与色谱峰面积成良好的线性关系，相关系数均不小于0.997，方法检出限为0.002～0.004 mg／L。测定结果的相对标准偏差为0.80%～3.38%(n=6)，样品加标回收率为75.0%～98.7%。该方法简便、快速，灵敏度高，适用于大气降水中F–，Cl–，NO2–，Br–，NO3–，SO42–和PO43–7种阴离子的同时测定。关键词 离子色谱法；降水；阴离子中图分类号：O657.7 文献标识码：A 文章编号：1008–6145(2020)02–0023–04
Simultaneous determination of seven anions in rainwater by ion chromatography
XUE Weifeng1, LI Li2, CAO Wenjun3, LIU Ming3(1. Inspection and Quarantine Technical Center of Dalian Entry-Exit Inspection and Quarantine Bureau, Dalian 116600, China;2. Dalian Inspection and Testing Certification Technology Service Center, Dalian 116600, China;3. China Inspection (Dalian) Test Technology Co., Ltd., Dalian 116600, China)Abstract A method for simultaneous determination of seven anions including F–, Cl–, NO2–, Br–, NO3–, SO42–and PO43– in rainwater by ion chromatography was established. Seven anions were separated on IonPac®AS19 analytic column (4 mm×250 mm) with KOH as eluent and determined by suppressed conductivity detector. The mass concentration of the seven anions had a good linear relationship with the chromatographic peak area in their respective ranges, the correlation coefficients were not less than 0.997, and the detection limit of the method was 0.002–0.004 mg／L. The relative standard deviation of determination results was 0.80%–3.38%(n=6), and the recoveries of the standard addition were 75.0%–98.7%. The method is simple, rapid and sensitive, and it is suitable for the simultaneous determination of seven anions in rainwater.Keywords ion chromatography; rainwater; anions
