Highly Sensitive Mass Spectrometric Analysis of Trace Iodine in Environmental Samples
10.19756/j.issn.0253-3820.251179
- VernacularTitle:环境样品中痕量碘的高灵敏质谱分析
- Author:
Huan JIANG
1
;
Yan-Yun WANG
;
Yu-Kun FAN
;
Ning CHEN
;
Xiao-Lin HOU
Author Information
1. 中国科学院地球环境研究所,黄土科学全国重点实验室,陕西省加速器质谱技术及应用重点实验室,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:
Inductively coupled plasma mass spectrometry;
Trace iodine;
Environmental samples;
Collision/reaction cell;
Climate change
- From:
Chinese Journal of Analytical Chemistry
2025;53(9):1536-1545
- CountryChina
- Language:Chinese
-
Abstract:
The cycling of iodine in the atmosphere and ocean plays a critical role in climate and environmental change.Ice cores and tree rings,as ideal climate archives,can provide essential data for paleoclimate reconstruction through accurate iodine analysis.However,iodine concentrations in ice core samples are as low as 0.01 μg/L,and as low as 0.01 μg/g in tree rings.Most currently reported analytical methods face challenges in accurately quantifying such low levels.In this study,a highly sensitive analytical method for trace iodine in environmental samples was developed based on inductively coupled plasma mass spectrometry(ICP-MS),incorporating a collision/reaction cell under the optimized collision/reaction gas conditions.Collision/reaction cell mode was employed to evaluate potential interferences in determination of trace iodine by ICP-MS.The results indicated that peak tailing from adjacent mass-to-charge ratios and polyatomic ion interferences could be considered negligible.However,residual iodine in ultrapure water constituted the major source of background,highlighting the need for strict control of sample pretreatment and procedural blanks in trace-level iodine analysis.By utilizing collision focusing effect of helium,the measurement sensitivity of iodine was enhanced to 3.5×105 cps(counts per second)/(μg/L),and the detection limit was reduced to 0.002 μg/L.The developed method exhibited a deviation of less than 2.3%in measurement of low-concentration standard solutions,indicating good accuracy.For actual samples and blanks,the precision of repeated measurements within 2 h was better than 1.6%,demonstrating excellent repeatability.No significant memory effect was observed during the measurements.The established method was successfully applied to determination of trace iodine in ice cores,tree rings,and other environmental samples,providing a robust technical foundation for investigating the role of iodine in climate and environmental change.
