离子色谱法测定水中亚硫酸根的优化  

Determination Optimization of Sulfite in Water by Ion Chromatography

作　　者：严瑾 胡恩宇 YAN Jin;HU Enyu(Nanjing Environmental Monitoring Center of Jiangsu Province,Nanjing,Jiangsu 210013,China)

机构地区：[1]江苏省南京环境监测中心,江苏南京210013

出　　处：《环境监控与预警》2023年第4期63-67,共5页Environmental Monitoring and Forewarning

基　　金：江苏省环境监测科研基金项目(1807)。

摘　　要：为了提高离子色谱法测定水中亚硫酸根的准确性,通过条件实验,对亚硫酸根稳定性、淋洗液有机改进剂等进行优化。选择Metrosep A Supp 5150色谱柱,以3.2 mmol/L的碳酸钠+1.0 mmol/L的碳酸氢钠+5.0%的丙酮溶液为淋洗液,经离子色谱检测,亚硫酸盐的质量浓度在0~10.0 mg/L范围内与色谱峰面积线性关系良好,检出限为0.034 mg/L。实际样品测定结果的相对标准偏差为2.4%~4.7%,加标回收率为96.8%~103%。该方法可延长亚硫酸盐标准溶液的保存时间,有效分离亚硫酸根和硫酸根,灵敏度高、正确度与精密度良好,适用于水中亚硫酸根的测定。In order to improve the accuracy of the determination of sulfite in water by ion chromatography,the stability of sulfite and the organic modifiers were optimized through conditional experiments.A Metrosep A Supp 5150 column was selected,and 3.2 mmol/L Na_(2)CO_(3)+1.0 mmol/L NaHCO_(3)+5.0%CH 3COCH_(3) was used as eluent.The mass concentration of sulfite has a good linear relationship with the chromatographic peak area in the range of 0~10.0 mg/L,and the detection limit is 0.034 mg/L.The relative standard deviations of the actual sample were 2.4%~4.7%,and the spike recoveries were 96.8%~103%.This method can prolong the storage time of sulfite standard solution,effectively separate sulfite and sulfate,and has the advantages of high sensitivity,good accuracy and precision.

关 键 词：离子色谱 亚硫酸根 保存时间 淋洗液 有机改进剂 

分 类 号：X832[环境科学与工程—环境工程]