离子色谱法测定饮用天然山泉水中9种阴离子

摘要

To develop an ion chromatography (IC) for simultaneous determination of 9 anion in drinking spring water. The IC separation was carried out with the DIONEX ICS-900 ion chromatograph, IonPAC AS9-HC and IonPac AG9-HC column by 9.0 mmol/L carbonate eluent at the flow rate of 1.0 mL/min. The injection volume was 500μL. Conductivity detection cell temperature was set at 30℃. Suppressor was in automatic regeneration mode, suppressor current was 100 mA. The average linear of 9 anion was r=0.999 6. The recovery rates were 91.1%-105.6%and the relative standard deviations (RSD) were 0.38%-1.97%. The content of samples were in linear range. The method is simple, fast, accurate, sensitive, little interference and applicable to the simultaneous determination of 9 anion in drinking spring water.%建立能同时直接进样测定饮用天然山泉水中9种阴离子（F-、ClO2-、BrO3-、Cl-、NO2-、ClO3-、Br-、NO3-、SO42-）的离子色谱法。选择美国戴安公司DIONEX ICS-900型离子色谱仪，以IonPac AS9-HC阴离子色谱柱为分析柱，IonPac AG9-HC阴离子保护柱，淋洗液为碳酸盐系统9.0 mmol/L Na2CO3，流速为1.0 mL/min，进样体积为500μL，电导检测器温度为30℃，以氮气作为保护气，抑制器抑制模式为自循环再生模式，抑制器电流为100 mA。该方法的标准曲线平均相关系数为r=0.9996，平均回收率为91.1%~105.6%，RSD为0.38%~1.97%；对4个饮用天然山泉水样品进行检测，样品中9种阴离子的含量都在线性范围内。该法操作简单、快速、准确，灵敏度高、重现性好，适用于饮用天然山泉水中9种阴离子的直接测定。