Distribution of Fluorine in Surface Water and Sediment of Anning River Basin
In order to examine the distribution characteristics of fluorine in the surface water and sediment samples of the Anning River,samples were collected from 14 locations along the main river and its tributaries in 2022.The fluorine content in both the surface water and the sediment were determined through the use of ion chromatography and molten alkali-ion selective electrode techniques,to evaluate the distribution patterns and factors that contribute to the presence of fluorine in the Anning River.The results indicated that fluorine contamination was confined to the tributaries of rare earth mining areas along the Anning River,and the average fluoride concentration in the water samples ranged from 0.14 to 1.33 mg/L.The majority(99％)of fluoride in sediment was found to be in a residual state,limiting its reactivity with other compounds and reducing the risk of toxicity to organisms.Additionally,a significant correlation was observed between water fluoride levels and the presence of rare earth elements(REE),barium(Ba),lead(Pb),and sulfate ions(SO42-)(P＜0.01).Principal component analysis indicated that the presence of water fluoride levels can be linked to the extraction and processing of rare earth minerals,with its chemical composition also being influenced by natural processes like rock erosion.
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