离子色谱法检测二次精盐水中的痕量铵

Determination of Trace Ammonium in Secondary Refined Brine by Ion Chromatography

摘要: 建立了利用分离-抑制型电导检测离子色谱法测定30%二次精盐水中痕量铵的方法。以高容量IonPac CS16阳离子交换分离柱分离，甲烷磺酸淋洗液一步梯度洗脱，抑制型电导检测。对铵离子检测方法的线性范围为5~100 μg/L，相关系数为0.9995，铵的检出限（S/N=3）为1.9 μg/L。方法成功用于二次精盐水中痕量铵的检测。对样品进行加标回收试验，回收率为88%~107%。样品只需简单稀释、过滤后即可直接进样分析。方法操作简单、选择性好、灵敏度高。

Abstract: A new method was developed for determination of ammonium in secondary refined brine by ionchromatography separation and suppressed conductivity detection. The ammonium had a good resolution with sodium in the brine on IonPac CS16 column using MSA as gradient eluent. The detection limit of amine was 1.9 μg/L with linear correlation coefficient of 0.9995 in the range of 5～100 μg/L of ammonium. The spiked recoveries were 88%～107%. The secondary refined brine samples were pretreated through dilution and filtration before injection. The method provides good sensitivity and selectivity, easy operation and has been successfully used in measuring the ammonium in secondary refined brine in chloralkali industry.