离子色谱法同时测定工作场所空气中9种阴离子

Simultaneous determination of 9 kinds of anion in workplace air by Ion chromatography

目的建立同时测定工作场所空气中9种阴离子质量浓度的离子色谱法。方法工作场所空气中氟离子、氯离子、亚硝酸根离子、溴离子、硝酸根离子、硫酸根离子、磷酸根离子、草酸根离子和碘离子共9种阴离子经碳酸钠-碳酸氢钠(浓度分别为3. 2、1. 1 mmol/L)吸收液采集后,经阴离子色谱柱分离及电导检测器检测,采用外标法进行定量分析。结果该9种阴离子在相应质量浓度范围内线性关系良好(相关系数均> 0. 999),检出限为0. 02～0. 18 mg/L,加标回收率为96. 0%～100. 5%,批内相对标准偏差(RSD)为0. 3%～2. 5%,批间RSD为0. 4%～3. 1%,采样效率均> 96. 8%,样品在室温状态下可保存5 d。结论本方法准确性好,灵敏度高,操作简便快速,可同时测定工作场所空气中多种阴离子。

Objective To establish a simultaneously detecting method for 9 kinds of anion in workplace air by ion chromatography. Methods Nine kinds of anions in workplace air include fluoride ion,chloride ion,nitrite ion,bromide ion,nitrate ion,sulfate ion,phosphate ion,oxalate denominationbl and iodide ion were sampled with sodium carbonatesodium bicarbonate( concentration 3. 2,1. 1 mmol/L respectively),separated by the anion column,detected by the conductivity detector and quantified by external standard method. Results The linearity of the 9 anions in the corresponding mass concentration range was good( correlation coefficient > 0. 999). The detection limit was 0. 02-0. 18mg/L and the marking recovery was 96. 0%-100. 5%. The within-run relative standard deviation( RSD) was 0. 3%-2. 5%,and the between-run RSD was 0. 4%-3. 1%. All the sampling efficiencies were > 96. 8%,and the samples could be stored at room temperature for 5 days. Conclusion The method has good accuracy,high sensitivity,with simple and rapid operation,and can simultaneously measure various anions in the air of workplace.