A Sensitive Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry Method for Analysis of Iodine Speciation in Environmental Water Samples
10.19756/j.issn.0253-3820.241391
- VernacularTitle:离子色谱-电感耦合等离子体质谱法灵敏分析环境水样中的碘形态
- Author:
Huan JIANG
1
;
Ning CHEN
;
Yan-Yun WANG
;
Yu-Kun FAN
;
Meng-Ting ZHANG
;
Lu-Yuan ZHANG
;
Xiao-Lin HOU
Author Information
1. 中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,西安加速器质谱中心,西安 710061;西安地球环境创新研究院,西安 710061
- Keywords:
Ion chromatography;
Inductively coupled plasma mass spectrometry;
Iodine speciation;
Environmental water samples;
Caesium-133 internal standard
- From:
Chinese Journal of Analytical Chemistry
2025;53(2):278-288
- CountryChina
- Language:Chinese
-
Abstract:
Iodine speciations in aquatic environments are affected by dissolved oxygen,redox potential,microbial activity,organic matter decomposition,light reaction,etc.Accurate quantification of iodine speciation can not only help to understand the geochemical cycle of iodine,but also help to trace and study environmental processes.Based on the combination of ion chromatography(IC)and inductively coupled plasma mass spectrometry(ICP-MS),a rapid and sensitive method was established for determining the speciations of iodine in environmental water samples including seawater,river water,lake water,rainwater,groundwater,etc.The results presented here showed that IO3?and I?in seawater were quickly separated and measured within 120 s when using guard column AG22 and 8 mmol/L(NH4)2CO3 as the mobile phase.While for lake water,river water and precipitation samples with high soluble organically bond iodine(SOI),an AS22 separation column(250 mm×4 mm)connected with a guard column and using 50 mmol/L(NH4)2CO3 as mobile phase could effectively separate unknown SOI from IO3? to achieve accurate quantification of IO3?.For accurate correction of iodine measurement signal fluctuations,133Cs was directly added to the(NH4)2CO3 mobile phase as an internal standard.The SOI content was calculated by the total iodine concentrations minus the sum of IO3?and I?.The precision of the established iodine speciation analytical method was better than 3.5%,and the standard addition experiment showed that the analytical method was accurate.When the injection volume was 25 μL,the detection limits were 0.011?0.025 μg/L for IO3? and 0.023?0.031 μg/L for I?,respectively.The method was successfully used to analyze IO3?,SOI and I? in environmental water samples,such as seawater,river water,rainwater and groundwater.
