引用本文:严瑾,胡恩宇.离子色谱法测定水中亚硫酸根的优化[J].环境监控与预警,2023,15(4):63-67
YAN Jin,HU Enyu.Determination Optimization of Sulfite in Water by Ion Chromatography[J].Environmental Monitoring and Forewarning,2023,15(4):63-67
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离子色谱法测定水中亚硫酸根的优化
严瑾,胡恩宇
江苏省南京环境监测中心,江苏 南京 210013
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 5-150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。
关键词:  离子色谱  亚硫酸根  保存时间  淋洗液  有机改进剂
DOI:10.3969/j.issn.1674-6732.2023.04.010
分类号:X832
基金项目:江苏省环境监测科研基金项目(1807)
Determination Optimization of Sulfite in Water by Ion Chromatography
YAN Jin, HU Enyu
Nanjing Environmental Monitoring Center of Jiangsu Province,Nanjing,Jiangsu 210013,China
Abstract:
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 5-150 column was selected, and 3.2 mmol/L Na2CO3+1.0 mmol/L NaHCO3+5.0% CH3COCH3 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.
Key words:  Ion chromatography  Sulfite  Preservation time  Eluent  Organic modifier