离子色谱法测定富硒矿泉水中7种阴离子
Determination of seven anions in selenium rich mineral water by ion chromatography
常莹 1马作江 1周海燕 1周灵 1程加刚2
作者信息
- 1. 国家富硒产品质量检验检测中心,恩施土家族苗族自治州公共检验检测中心 湖北恩施 445000
- 2. 恩施市公共检验检测中心
- 折叠
摘要
建立离子色谱法同时测定富硒矿泉水中F-、BrO3-、NO2、NO3-、SO42-、SeO32-、SeO42-7种无机阴离子的方法.采用Metrosep A Supp 5-250/4.0型阴离子交换柱为分离柱,样品过0.22 μm水系滤膜后直接测定,以3.2 mmol/L Na2CO3+1.0 mmol/L NaHCO3溶液为淋洗液,以0.7 mL/min流量等度洗脱分离,再通过抑制电导检测,7种无机阴离子分别在0.025～0.500 mg/L和0.05～1.00 mg/L质量浓度范围内线性关系良好,相关系数均大于0.999,方法检出限为0.001 2～0.005 2 mg/L,样品加标回收率为90.9％～107.0％,6次平行测定结果的相对标准偏差小于10％(n=6).该方法检出限低,简便快速,可用于富硒矿泉水及其它饮用水中多种阴离子的同时监测.
Abstract
The method was established for the simultaneous determination of F-、BrO3-、NO2-、NO3-、SO42-、SeO32-、SeO42-in seleni-um rich mineral water by ion chromatography.Metrosep A Supp 5-250/4.0 anion exchange chromatography column was used as the analytical column,the sample can be determined after through 0.22 µm water filtration membrane,3.2 mmol/L Na2CO3-1.0 mmol/L NaHCO3 was used as the mobile phase,the flow rate was 0.7 mL/min,then by inhibitory conductance detection,the seven kinds of inorganic anions were linearly related in the mass concentration range of 0.025-0.500 mg/L and 0.05-1.00 mg/L,respectively,the correlation coefficients were not less than 0.999,and the detection limits of the method were 0.001 2-0.005 2 mg/L.The standard addition recoveries were 90.9％-107.0％.The relative standard deviations of the measurement results were less than 10％(n=6).The method has low detection limit,simplicity and speed,it can be used for the simultaneous determination of various anions in selenium rich mineral water and other drinking water.
关键词
离子色谱法/硒/矿泉水/阴离子Key words
Ion chromatography/Selenium/Mineral water/Anion引用本文复制引用
出版年
2024
NETL
NSTL
万方数据