离子色谱法测定氢氧化钠溶液中的碳酸盐

Determination of carbonate in sodium solution with ion chromatography

目的：建立工业用氢氧化钠溶液中碳酸盐的检测方法。方法：样品稀释25倍后,经MetroSep Organic Acid柱进行分离,用离子色谱法检测。结果：在1.0~500 mg/L浓度范围内,碳酸盐工作曲线的相关系数r大于0.999,回收率在98%~101.1%之间,碳酸盐的检测限为0.1μg/L。结论：该方法能很好地满足工业用氢氧化钠溶液中碳酸盐的含量测定。

Objective：To develop a method for determination of carbonate in industrial sodium solution. Methods：After being diluted for 25 times, sample was separated by MetroSep Organic Acid column and determined with ion chromatography （IC）. Results：The calibration curve showed good linearity in the range of 1.0 - 500 mg/L （r 〉0. 999）. The recovery of the method was 98% - 101.1% and the detection limit 0. 1 ug/L. Conclusion：This method is suitable for determination of carbonate in industrial sodium solution.