Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (3): 1-10.DOI: 10.13745/j.esf.sf.2022.1.47

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Genesis and occurrence of high iodine groundwater

WANG Yanxin(), LI Junxia, XIE Xianjun   

  1. School of Environmental Studies, China University of Geosciences (Wuhan)/State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Wuhan 430074, China
  • Received:2022-01-10 Revised:2022-02-02 Online:2022-05-25 Published:2022-04-28


China has the largest occurrence of water-borne high iodine groundwater in the world. Long-term excessive iodine uptake has substantial negative effects on the health of local residents. Under different environmental hydrogeological conditions, the genetic types of high iodine groundwater include burial-dissolution type, compaction-release type, and evaporation-concentration type. Based on our understanding of the genesis of high iodine groundwater, big data models were employed to predict the nation-wide occurrence of high iodine groundwater in China. The high-risk area (p>0.5) of high iodine groundwater was found to account for 19.8% of China’s land area, covering the regions already known to have high iodine groundwater in their subsurface. Studies on the genesis and occurrence of high iodine groundwater, including characterization of organic iodine species in groundwater system, identification of the microscopic mechanisms affecting hydrogeochemical behaviors of iodine, and modeling of the processes controlling the iodine mobilization, will provide important scientific evidence to support the safe supply of water and prevention of water-borne hyperiodized goiter.

Key words: iodine, groundwater, big data, genesis, goiter

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