Rapid determination of iodine in water by sodium persulfate oxidation ICP-MS
10.3760/cma.j.cn231583-20240802-00213
- VernacularTitle:过硫酸钠氧化-电感耦合等离子体质谱法快速测定水碘含量
- Author:
Hao WANG
1
;
Jinhua YUAN
1
;
Jing CAO
1
;
Liya WANG
1
;
Qian JI
1
Author Information
1. 南京市疾病预防控制中心 南京市公共卫生检验检测重点实验室，南京 210003
- Publication Type:Journal Article
- Keywords:
Iodine;
Sodium persulfate oxidation;
Inductively coupled plasma mass spectrometry;
Domestic drinking water;
Mineral water
- From:
Chinese Journal of Endemiology
2025;44(7):590-593
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To establish a rapid method for determination of iodine in water by sodium persulfate oxidation inductively coupled plasma mass spectrometry (ICP-MS).Methods:A 100 μl of 30% sodium persulfate solution was added to 10 ml of water sample, followed by reaction at room temperature for 30 min. A 50 μg/L mixed solution containing indium and 8 other elements was used as the internal standard solution. The flow ratio of the internal standard solution to the test solution was 1∶7. The iodine in water was determined by ICP-MS. The linear range, detection limit, accuracy, precision, and anti-interference ability of the method were evaluated.Results:Iodine in water could be determined and had a good linear relationship within the range of 0 - 100 μg/L, with a correlation coefficient ( r) of ≥0.999 9. The detection limits of potassium iodate and potassium iodide were 0.07 and 0.08 μg/L, respectively, and the quantitation limits were 0.24 and 0.26 μg/L, respectively. The low, medium, and high concentration spiked recovery rates of six substrate water samples (source water, treated water, end-use water, packaged drinking water, packaged mineral water, and natural mineral water) ranged from 94.0% to 104.0%, with a relative standard deviations ( RSD) ranged from 0.5% to 2.8%. Interference test confirmed that 29 elements (at 1.00 mg/L) did not affect the determination of iodine at 6.00 μg/L. The determination results of the standard substance (GBW09114K) for iodine content in water were all within the standard range (56.0 - 68.0 μg/L), with an RSD of 0.6%. Conclusions:A method for rapid determination of iodine in water by the sodium persulfate oxidation ICP-MS method is successfully established. This method is easy to operate, has high sensitivity and good accuracy, and is suitable for batch analysis of iodine in drinking water and mineral water.
