Hydrochemical Characteristics and Enrichment Mechanism of Shallow High Fluorine Groundwater in Feng County
The excessive F-concentration of shallow groundwater is a serious problem in Feng County,which poses a threat to the drinking water health of rural residents.To ensure the safety of rural drinking water,the F-distribution characteristics and enrichment mechanism of shallow groundwater were explored by combining conventional water chemistry methods such as piper diagram,Gibbs dia-gram,ion ratio analysis and isotope water chemistry methods.The results showed that the F-concentration of shallow groundwater in the study area ranged from 0.21 to 5.52 mg/L,with an overall trend of high in the northeast and low in the southwest.Highly fluorida-ted groundwater accounted for 75％of the total,with a weakly alkaline environment,and the main water chemistry type was Na-S04-Cl type.The F-enrichment of shallow groundwater is mainly controlled by water-rock interaction,with fluorite dissolution,dolomite and calcite precipitation and cation exchange promoting the release of F.The weak alkaline environment provides OH-to promote F-desorp-tion.Anthropogenic factors such as agricultural irrigation and industrial effluent discharge have a strong influence on shallow groundwater F-concentration.Evaporation concentration and agricultural fertilization only affect the enrichment of F-in individual areas.
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