Similarities and Differences of Main Controlling Factors of Natural High Iodine Groundwater between North China Plain and Datong Basin

被引：0

作者：

Wang Y. ^{[1
]}

Li J. ^{[1
,2
,3
]}

Xue X. ^{[1
,2
]}

Tian X. ^{[4
]}

Chi X. ^{[4
]}

机构：

[1] School of Environmental Studies, China University of Geosciences, Wuhan

[2] State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan

[3] Laboratory of Basin Hydrology and Wetland Eco-Restoration, China University of Geosciences, Wuhan

[4] The Fourth Team of Hydrogeological and Engineering Geology, Hebei Bureau of Geo-Exploration, Cangzhou

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 01期

关键词：

Controlling factors; Datong basin; Environmental geology; Groundwater; Iodine; North China Plain;

D O I：

10.3799/dqkx.2019.261

中图分类号：

学科分类号：

摘要：

Natural high iodine groundwater is widely distributed in China. In order to find out the similarities and differences of mechanism of iodine occurrence in groundwater, the Datong basin and the North China Plain (NCP) were selected as representative areas in this study. Groundwater sampling and the analysis of hydrochemistry and iodine species were performed to understand the groundwater environment and hydrochemical evolution. The results showed that total iodine concentration in groundwater from Datong basin was 2.86-1 286 μg/L, and that in NCP was 2.40-1 106 μg/L. Approximately 50.0% and 49.5% of groundwater iodine from Datong basin and North China Plain exceed the national standard of 100 μg/L(GB19380-2016), respectively. At the Datong basin, the groundwater environment was characterized by organic matter-rich, alkaline, weak reducing and Na-HCO3 type water, which was formed by Quaternary fluvial and lacustrine deposits. Under this environment, the sediment iodine was prone to be released into groundwater in the form of iodide and further enrich in the discharge area along the groundwater flow direction. At the NCP, the six transgressions in the Quaternary leads to the alluvial-lacustrine and marine loose sediments rich in Na, Cl and I. At the coastal area, the alkaline and weak reducing conditions in combination with low hydraulic gradient were favorable for iodine release from aquifer matrix to groundwater. The main species of iodine in groundwater was also iodide. The differences between two areas was that high iodine groundwater at Datong basin was mainly influenced by enriched organic matter in groundwater system, while that at NCP was mainly controlled by iodine-rich marine sediments. © 2021, Editorial Department of Earth Science. All right reserved.

引用

页码：308 / 320

页数：12

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