KOH等度淋洗IC法同时测定自来水中微量ClO2-、ClO3-及常规阴离子

摘要

The method to determine a trace of chlorite, chlorate and common inorganic anions in running water with KOH isocratic elution by ion chromatography was investigated. The conditions of method was that the concentration of KOH is 20. 5 mmol/L, the flow rate is 1. 0 mL/min, and the injection volume is 50 μL. The results showed that the concentration of F-,Cl-,NO3 -, SO4 2-,ClO2 -,ClO3 - in water was determined completely only in 12 minutes. The correlation coefficients of calibration curve was 0. 997 0-0. 999 9,while the detection limits was between 0. 05-7. 00 μg/L. The relative standard deviation( RSD) and the recoveries were between 0. 61%-3. 82%and 97. 6%-101. 7%, respectively. The method was sensitive, accurate and rapid, which was favorable to simultaneous quantification of chlorite, chlorate and common inorganic anions in drinking water.%建立了KOH等度淋洗离子色谱法同时测定自来水中微量亚氯酸盐、氯酸盐及氟化物、氯化物、硝酸盐、硫酸盐的分析方法。该方法以20.5 mmol/L KOH为淋洗液，流速1.0 mL/min，进样量50μL。结果表明，6种阴离子可在12分钟内检测完毕，各离子的线性相关系数为0.9970~0.9999；检出限为0.05~7.00μg/L；精密度为0.61％~3.82％；回收率为97.6％~101.7％，能够满足饮用水中这些指标的定量需要，是一种灵敏、准确、快速的理想方法。