离子色谱双通道同时分析矿泉水中阴阳离子

Determination of Anions and Cations in Mineral Water by Dual Channel Ion Chromatography

建立了一种离子色谱双通道同时检测矿泉水中阴阳离子的方法。阴离子通道选择SH—Anion一013的阴离子色谱柱，洗脱液为3．6mmol／LNa2CO3，流速0．7mL/min，采用抑制电导的检测模式。阳离子通道选择SH—Cation一012的阳离子色谱柱，洗脱液为3．0mmol／L甲烷磺酸，流速1．0mL／min，采用直接电导的检测方法。结果表明，待测离子线性范围宽，相关性好（R〉0．999），精密度高（RSD≤2．35％），实际样品加标回收率在92．5％～103．8％之间，完全满足检测要求，适用于矿泉水中阴阳离子的检测。

A method for simuhaneous determination of anions and cations in mineral water by dual channel ion chromatography was established.The anion channel selected SH-Anion-O13 anion column as the separation column, 3.6 mmol/L Na2CO3 was used as the eluent and the flow rate was 0.7 mL/min.The detection mode was suppressed conductivity.The cation channel selected SH-Cation-O12 cation column as the separation column, 3.0 mmol/L methane sulfonic acid was used as the eluent and the flow rate was 1.0mL/min. The detection mode was direct conductivity. It showed that the method had broad linearity range, good correlation（R〉O.999）,high precision（RSD ≤〈 2.35 %） and the average recoveries of actual samples were 92.5% -103.8%. It can entirely satisfy the determination requirement and can be applied to analyze anions and cations in mineral water.