Fluorine Pollution of Soil in Kuitun Reclamation Area of Xinjiang

Ninety-nine soil samples are taken from four state farms in Kuitun reclamation area of Xinjiang by using grid sampling method,and the geo-statistical method and GIS technology are used to analyze the testing data.The result shows that the contents of water-soluble fluorine in all soil samples are more than 2.50 mg/kg which is the value in topsoil of local fluoride epidemic occurring areas in China.The average value reaches 22.15 mg/kg,the maximum was 76.39 mg/kg,and the phenomenon caused by high content of fluorine has already appeared.On the four investigating state farms,the diversity of the content of water-soluble fluorine in soil of No.129 state farm is the maximum,the coefficient of variation is 64.98%;the areas with high content of water-soluble fluorine in soil are relatively concentrated,the content of water-soluble fluorine in soil surpass 30.00 mg/kg appear at No.127,128 and 129 states farms,and the No.128 state farm occupies the most areas.