Spatial Distribution and Mobilization of Iodine in Groundwater System of North China Plain:Taking Hydrogeological Section from Shijiazhuang,Hengshui to Cangzhou as an Example
Xue Xiaobin
Li Junxia
Qian Kun
Xie Xianjun
Abstract：High iodine groundwater is another global drinking water safety problem in addition to after high arsenic and high flu-orine groundwater.However,the research on the existing forms of iodine and the mechanisms of migration and enrichment of iodine in groundwater system is still insufficient research on the existing forms of iodine and the mechanisms of migration and enrichment of iodine in groundwater system.To understand spatial distribution and mobilization of iodine in groundwater sys-tem of North China plain(NCP),a hydrochemical study was conducted.The results show that iodine concentration in groundw-ater from NCP rangesd from 3.35 to 1 106μg/L,and 41.86% of groundwater samples has iodine concentration exceeding drink-ing water level(150μg/L)recommended by Chinese government.High iodine groundwater(>150μg/L)is mainly distributed in deep aquifers of Bohai bay area.The main species of groundwater iodine include mainly diodide and iodate,the distribution of which is controlled by redox environment of groundwater,and iodate mainly occurs in oxidizing condition.Along the groundwa-ter flow path from Shijiazhuang,Hengshui to Cangzhou,hydrochemical evolution and inverse modeling were performed to un-derstand the groundwater environment favoring iodine enrichment in groundwater.The results of hydrochemical evolution showed that at Bohai bay area,the weak-alkalinity and(sub)reducing environment influenced by seawater intrusion favor the iodine release and enrichment in groundwater.The adsorption equilibration of iodine among metal oxyhydroxides under various environments is the primary hydrogeochemical process controlling iodine mobilization in the groundwater system of the North China plain.
Keywords：iodinemobilizationgroundwaterNorth China Plain
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 910-921 )