Fluorine Chemical Speciation And Spatial Distribution Characteristics In Sanping Fluorite Mine Wasteland Soil Of Ledong County

Fluoride is a kind of nonmetal chemical element which is most widely distributed in nature.It is also a kind of the essential element in human body and biology.Usually Fluoride is distributed in soil,water,plants and animals in chemical form.Therefore,the fluorine content in soil of the Sanping fluorite mine in Ledong county was researched on in this paper.On this basis,the chemical content,spatial distribution,the correlation between different chemical forms and the pollution situation are analyzed.Finally,the single factor pollution coefficient and the geological cumulative pollution coefficient were used to evaluate the environmental quality of the soil,in order to understand the pollution status of fluorine in the soil.It can not only provide the basis for the ecological restoration of the soil of Hainan fluorite mine,but also provide suggestions for remediation of soil pollution in mining areas.The results of this paper are as follows:1、The research on fluoride content in the soil shows that the fluorine content in the surrounding soil of the Sanping fluorite mine in Ledong is relatively high in the horizontal direction.It is higher than that of Hainan soil.The fluoride content in soil of pithead is 30.50 times higher,and the maximum fluoride content in soil of peripheral area is about 26.78 times higher.Therefore,the soil around Sanping fluorite mine is in severe pollution.2、All sampling points in the study area,conversion of their chemical forms of there exist certain differences.In addition to the average conversion rate of water-soluble fluorine,the conversion rate of other chemical forms at the pithead is lower than that of peripheral area.3、From the spatial distribution point of view,in horizontal distribution the average content of fluoride in soil of pithead is higher than that in soil of peripheral area.And in the vertical direction the general trend of the total fluorine and residual fluorine content is gradually decreased with the depth of the soil,but it is on the contrary in the paddy soil.In the paddy soil,the human activities speed up the migration of fluorine downwards.In the soil around Sanping fluorite mine The trend of fluoride as each chemical form is as follows,residual state > water-soluble state > organic bound state > iron-manganese bound state > exchangeable state.4、There are some differences in the correlation between the chemical forms of fluoride in different study areas.At the pithead,in addition to the correlations between the total fluorine and organic bound state fluoride,the correlation between the exchangeable state and the residual state,the correlation between organic bound state and residual state,the correlations between other fluoride states are significant positive.With the increase of soil depth,the correlation between the various forms of fluoride is getting stronger.At 40~60 cm soil depth,the total fluorine has significant correlations with each form of fluoride.This indicates that after leaching,the clay,iron and aluminum trioxide and humus and other substance leaches out heavily.However,deep soil is in the deposition layer,so the soil parent material greater impact.Different forms of fluoride transform to each other slowly.5、In the view of environmental quality assessment,the total fluorine and available fluorine are used as evaluation factors to evaluate the soil around the Sanping fluorite mine in Ledong,and the single factor and the earth cumulative index method were used to evaluate the degree of fluoride pollution in the soil.The results showed that total fluorine(23.68)> water-soluble state fluoride(9.37).Therefore,it is in severe pollution.The cumulative pollution index of the two areas at the pithead is that total fluorine(3.96)> water-soluble state fluoride(2.64),It is in heavy pollution and medium pollution to heavy pollution.The cumulative pollution index of total fluorine and water-soluble state fluoride in soil decreases,and the pollution degree also decreased.Total fluorine is 0 to 20 cm(10.81)> 20 to 40cm(9.28)> 40 to 60cm(8.18),the degree of pollution is extremely strong pollution,extremely strong pollution,and extremely strong pollution respectively.Water-soluble state fluoride is 0 to 20cm(2.03)> 20 to 40cm(1.64)> 40 to 60cm(1.50),the degree of pollution is medium ~ strong pollution,medium pollution,and medium pollution respectively.