Abstract:

 Fluorine is an important trace element in the ecosystem，either the excess or the deficiency of fluorine can cause diseases in animals as well as humans In the human body，fluorine is derived mostly from the consumption of water and food，which is directly affected by the soil fluorine content，fluorine fractions and soil physicalchemical properties，especially soil soluble fluorine content In this paper，fluorine content in the soils collected from Anhui province was studied using sequential chemical extraction procedure，and correlation analysis was also conducted to determine the relationships between soil fluorine fractions and soil physicochemical properties The results showed that total fluorine content in soils was 1066—1 2367mg/kg with a mean value of 4852 mg/kg The order of the soil total fluorine content  of different soil types was vegetable soil>fluvoaquic soil>lime soil>yellow brown soil>yellow cinnamon soil>paddy soil>shajiang black soil>yellowred soil Soil parental material was the main contributing factor affecting the soil total fluorine content Our results showed that the soil total fluorine content was in accordance with its parental materials in the following order from high to low：Huanghe river alluvium>shallow limnetic facies sediment>limestone efflorescence>granite efflorescence>Changjiang alluvium>Late pleistocene loess>river alluvial deposit>Huaihe alluvium>drift deposit>Quaternary red earth In vegetable soils，besides soil parental materials，the total fluorine content in the top soil was also affected by the addition of Fcontaining phosphate fertilizers，pesticides and highfluoride irrigation water The soluble fluorine content of the soils in Anhui province was 042—2248 mg/kg with a mean value of 338 mg/kg The soluble fluorine content order in these soils was vegetable soil>shajiang black soil>fluvoaquic soil>yellow brown soil>yellow cinnamon soil>paddy soil>lime soil>yellowred soil Fluorine forms in soils were separated into five fractions：water soluble fluorine，exchangeable fluorine，fluorine bound to Fe/Mn oxides，fluorine bound to organic matter and mineral fluorine Mineral fluorine was the majority of fluorine，accounting for over 95% of total fluorine The left 5% fluorine existed as the forms of soluble fluorine，organic fluorine compound，Fe，Mn oxidesfluorine and exchangeable fluorine The content of total fluorine was positive correlative with content of soil total phosphor and soil clay （<0001 mm），and the coefficient was 0331 5 and 0312 4 respectively The content of water soluble fluorine was significantly correlated with soil pH value，and also was positive correlative with soil total phosphor，the coefficient was 0660 2 and 0353 9 respectively The content of exchangeable fluorine was positive correlative with soil clay （<0001mm） [JP]and soil cation exchange capacity， the coefficient was 0338 4 and 0345 8 respectively Organicfluorine was significantly positive correlative with soil organic matter，and the coefficient was 0526 8.