Effect of Organic Matter on Iodine Mobilization in Groundwater of Datong Basin

被引：3
|
作者：
Zhao S. [1 ]
Liu W. [1 ]
Sun D. [1 ]
Li J. [1 ]
机构：
[1] School of Environmental Studies, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 12期
关键词：
dissolved organic matter; fourier transform ion cyclotron resonance mass spectrometry; groundwater; hydrogeology; iodine; mobilization;
D O I：
10.3799/dqkx.2022.009
中图分类号：
学科分类号：
摘要：
Organic matter plays an important role in the mobilization of iodine in groundwater system. In this study, the high iodine groundwater from shallow and middle aquifers in Datong basin in China was collected to perform the effect of dissolved organic matter (DOM) on iodine mobilization in groundwater. The structure of dissolved organic matter (DOM) in groundwater was characterized by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). The results show that the range of total iodine concentration in groundwater is 1.97-926.10 μg/L. Iodide is the main species of iodine in groundwater. The total iodine concentration has a positive correlation with DOM (r=0.84) and a negative correlation with biodegradable organic matter (r=-0.71), indicating that the organic matter in high iodine groundwater experience more intensive biodegradation. The differences of DOM molecular composition between high and low iodine groundwater further show that microorganisms preferentially use small molecular biodegradable compounds such as CHO, CHON1 and CHON2 to promote the release of bound iodine into groundwater during degradation. The hydrochemical fate of groundwater iodine under the reducing environment is mainly related to the reductive dissolution of iron (hydrogen) oxides and the biodegradation of organic matter, during which iodine species changed, while under oxidizing environment, it could be related to the transformation of natural organic matter. © 2023 China University of Geosciences. All rights reserved.
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页码：4699 / 4710
页数：11
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