A method for determination of iodide in water by ion chromatography-integrated amperometric detection
10.3760/cma.j.cn231583-20241121-00396
- VernacularTitle:离子色谱-积分安培法测定水中碘化物的方法研究
- Author:
Xiuli WANG
1
;
Xuerong YU
;
Song HU
;
Ji'an XIE
;
Gang DING
;
Weidong LI
;
Shudong XU
Author Information
1. 安徽省疾病预防控制中心理化检验室，合肥 230601
- Publication Type:Journal Article
- Keywords:
Iodide;
Ion chromatography;
Integrated amperometric;
Trace amount
- From:
Chinese Journal of Endemiology
2025;44(4):327-331
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To establish an ion chromatography-integrated amperometric detection method for iodide in water.Methods:After the water sample was filtered through a filter membrane, the AS 11-HC anion chromatography column of ion chromatography method was used to separate iodide ions under the conditions of 70 mmol/L sodium hydroxide solution as the eluent, injection volume of 100 μl, column temperature of 30 ℃, and flow rate of 1.0 ml/min. The results were determined by silver working electrode integral amperometric detection method. Under the optimized experimental conditions, methodological evaluations such as method calibration curves, detection limits, quantification limits, precision, and accuracy were conducted.Results:Iodide followed a square correction curve within the concentration range of 0 - 100 μg/L, with a correlation coefficient ( r) > 0.999 9. The detection limit of the method was 0.30 μg/L, and the quantification limit was 1.00 μg/L. The determination results of the national standard substances GBW09113f and GBW09114f for iodine composition analysis in water were within the reference range [(8.4 ± 1.2), (55 ± 6) μg/L]. The recovery rates of low, medium, and high concentration spiked samples with low background values ranged from 91.7% to 97.2%, and the relative standard deviation ranged from 0.40% to 1.60%. Conclusion:This method has the characteristics of simple water sample pretreatment, high sensitivity, and good accuracy, which can meet the determination of trace iodides in bulk water samples for iodine deficiency disorders monitoring.
