Ye Liqing, Yang Wenhui, Yang Rui, Wu Yuke, Pang Zhengqin, Wang Xi, Huang Ke, Luo Hong, Zhang Jinyi, Zheng Chengbin
College of Chemistry and Material Science, Sichuan Normal University, Chengdu, Sichuan, 610068, China; Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610065, China.
Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610065, China.
Talanta. 2024 May 15;272:125833. doi: 10.1016/j.talanta.2024.125833. Epub 2024 Feb 24.
Iodine is essential for human growth and can enter the body through food, water, and air. Analyzing its presence in the environment is crucial for ensuring healthy human development. However, current large-scale instruments have limitations in the field analysis of iodine. Herein, a miniaturized purge and trap point discharge microplasma optical emission spectrometric (P&T-μPD-OES) device was developed for the field analysis of iodine in water. Volatile iodine molecules were produced from total inorganic iodine (TII) through a basic redox reaction under acidic conditions, then the purge and trap module effectively separated and preconcentrated iodine molecules. The iodine molecules were subsequently atomized and excited by the integrated point discharge microplasma and an iodine atomic emission line at 206.24 nm was monitored by the spectrometer. Under optimal conditions, this proposed method had a detection limit of 16.2 μg L for iodine and a precision better than 4.8%. Besides, the accuracy of the portable device was validated by successful analysis of surface and groundwater samples and a comparison of the mass spectrometry method. This proposed portable, low-power device is expected to support rapid access to iodine levels and distribution in water.
碘对人类生长至关重要，可通过食物、水和空气进入人体。分析其在环境中的存在对于确保人类健康发展至关重要。然而，当前的大型仪器在碘的现场分析方面存在局限性。在此，开发了一种小型化吹扫捕集点放电微等离子体光发射光谱仪（P&T-μPD-OES）装置用于水中碘的现场分析。在酸性条件下，通过碱性氧化还原反应从总无机碘（TII）中产生挥发性碘分子，然后吹扫捕集模块有效地分离并预富集碘分子。随后，碘分子被集成的点放电微等离子体雾化并激发，光谱仪监测206.24 nm处的碘原子发射线。在最佳条件下，该方法对碘的检测限为16.2 μg/L，精密度优于4.8%。此外，通过对地表水和地下水样品的成功分析以及与质谱法的比较，验证了该便携式装置的准确性。这种便携式、低功耗的装置有望支持快速获取水中碘的含量和分布情况。
