Geochemical characteristics and environmental quality assessment of fluorine in soil and water environment of Jinbei

Abstract Fluorine is a necessary trace element in humans, lack or excess can adversely affect human health. The geochemical characteristics and environmental quality of fluorine in soil and water environment of Jizhou district in northern Tianjin were studied. The results show: fluorine content in surface soil 201×10-6 ∼8545×10-6, average 757 ×10-6. The average content is the background value of surface soil in Tianjin 1.25 times twice, all over the country 1.58 times twice. In soil vertical profiles, the content of fluorine in clay soil is higher than that in sandy soil. The average groundwater fluorine content in plain area 1.50 mg/L, average mountain area 0.47 mg/L. Plain area is obviously larger than mountainous area. Over the whole district 90% the fluorine content of surface soil showed excess and high level. Proportion of groundwater samples in plain area with fluoride class IV and class V water 61.54%. Fluorine excess ratio in maize samples 26.67%. Maximum excess multiple greater than 2 times twice. Overall, the fluorine content in the surface soil and the groundwater in the plain area of North Tianjin is significantly higher, For high-fluorine areas, the fluorine content of some bulk agricultural products has exceeded the standard. We should pay attention to it.