离子色谱双通道同时分析矿泉水中阴阳离子

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。阴离子通道选择摘要SH-Anion-013的阴离子色谱柱,洗脱液为3.6mmol/LNa3CO2,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-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。

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

A method for simultaneous determination of anions and cations in mineral water by dual channel ion chromatography was established.The anion channel selected SH-Anion-013 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-012 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>0.999),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.