NDLI: Occurrence and hydrogeochemical characteristics of high-fluoride groundwater in Xiji County, southern part of Ningxia Province, China

Content Provider	Springer Nature Link
Author	Wei, Chao Guo, Huaming Zhang, Di Wu, Yang Han, Shuangbao An, Yonghui Zhang, Fucun
Copyright Year	2015
Abstract	High-F− groundwater is widely distributed in Xiji County, which endangers the safety of drinking water. In order to evaluate the key factors controlling the origin and geochemical mechanisms of F− enrichment in groundwater at Xiji County, one hundred and five groundwater samples and sixty-two sediment samples were collected. Fluoride concentration in the groundwater samples ranged from 0.2 to 3.01 mg/L (mean 1.13 mg/L), with 17 % exceeding the WHO drinking water guideline value of 1.5 mg/L and 48 % exceeding the Chinese drinking water guideline value of 1.0 mg/L. High-F− groundwaters were characterized by hydrochemical types of Na–HCO3 and Na–SO4·Cl, which were found in Quaternary sediment aquifer and in Tertiary clastic aquifer, respectively. Conditions favorable for F− enrichment in groundwater included weakly alkaline pH (7.2–8.9), low concentration of Ca2+, and high concentrations of HCO3 − and Na+. Calcite and fluorite were the main minerals controlling F− concentration in groundwaters. The hydrolysis of F-bearing minerals in aquifer sediments was the more important process for F− release in Tertiary clastic aquifer, which was facilitated by long residence time of groundwater, in comparison with Quaternary sediment aquifer. Cation exchange would also play important roles, which removed Ca2+ and Mg2+ and led to more free mobility of F− in groundwater and permitted dissolution of fluorite, especially in Tertiary clastic aquifer. However, evapotranspiration and competing adsorption of B and HCO3 − were the more important processes for F− enrichment in Quaternary groundwater. Groundwater in Lower Cretaceous aquifer had relatively low F− concentration, which was considered to be the potential drinking water resource.
Starting Page	275
Ending Page	290
Page Count	16
File Format	PDF
ISSN	02694042
Journal	Environmental Geochemistry and Health
Volume Number	38
Issue Number	1
e-ISSN	15732983
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-05-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	F− Groundwater Geochemistry Stable isotope Water–rock interaction Environmental Health Terrestrial Pollution Soil Science & Conservation Environmental Chemistry Public Health
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Medicine Geochemistry and Petrology Environmental Engineering Water Science and Technology

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