Fluorine is a necessary trace element for human beings, and lack or excess of fluorine will exert adverse effects on human health. In this paper, the geochemical characteristics and environmental quality of fluorine in soil, groundwater and crops in Jizhou district of northern Tianjin were studied. The results are as follows: The fluorine content in surface soil ranges from 201×10 -6 to 8545×10 -6, with an average of 757×10 -6. The average content is 1.25 times the background value of surface soil in Tianjin and 1.58 times that in China. In the vertical profile of soil, the fluorine content is higher in cohesive soil than that in sandy soil. The average fluoride content of groundwater in plain area is 1.50 mg/L and that in mountainous area is 0.47 mg/L. The fluoride content in plain area is obviously higher than that in mountainous area. Over 90% of the surface soil fluoride content in the region is excessive and high, and the proportion of groundwater samples of fluoride IV and V in plain area reaches 61.54%. The proportion of fluorine exceeding the standard in maize samples is 26.67%, with the maximum exceeding multiple over two times. Generally speaking, the fluorine content in surface soil and groundwater in the plain area of northern Tianjin is significantly higher than that in the high fluoride area. The fluorine content in some agricultural products has exceeded the standard, to which more attention should be paid by the relevant departments.
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