离子色谱法同时测定氟化钠中微量氯离子和硫酸根离子

摘要

A method for the simultaneous determination of trace Cl–and SO42– in sodium fluoride by ion chromatography with suppression conductivity detector was established. The separation was achieved on IonPac AS11–HC column with KOH solution as the mobile phase. The concentration of Cl–was linear with chromatographic peak area in the range of 0.1–0.4 mg/L, r=0.999 9; The concentration of SO42–was linear with chromatographic peak area in the range of 0.2–1.0 mg/L, r=0.999 6. The mean recovery were 98.0%and 95.4%, the relative standard deviations were 2.14%and 1.22%, and detection limits were 0.011 mg/L and 0.014 mg/L for Cl–and SO42–, respectively. This method has good linearity and selectivity,it can be used as the quality control method for Cl–and SO42–in sodium fluoride.%建立抑制电导检测离子色谱法同时测定氟化钠中微量氯离子和硫酸根离子的方法。采用IonPac AS11–HC阴离子交换分离柱，以氢氧化钾溶液为流动相。氯离子的质量浓度在0.1～0.4 mg／L范围内与色谱峰面积线性良好，r=0.9999；硫酸根离子的质量浓度在0.2～1.0 mg／L范围内与色谱峰面积线性良好，r=0.9996。氯离子、硫酸根离子测定结果的相对标准偏差分别为2.14%，1.22%(n=6)，加标回收率分别为98.0%，95.4%，检出限分别为0.011，0.014 mg／L。该方法选择性好，灵敏度高，可作为氟化钠中微量氯离子和硫酸根离子的质量控制方法。