Geochemical Characteristics Of Fluorine And Iodine In Typical Areas Of Shandong Province

Through the agricultural geological investigation in Shandong typical areas that Zhangqiu,Laiwu,Zaozhuang,Huantai and Qingdao,samples such as soil,food crops and specialty agricultural products were collected in the field,analysis of the geochemical characteristics of fluorine and iodine elements.The status of fluoride and iodine in soil and crop in the study area was evaluated according to the geological industry norms and related standards such as the "Land Quality Geochemical Evaluation Criteria".At the same time,the soils in the study area were evaluated synthetically.The results showed that the soil nutrient elements were abundant,the heavy metal elements were not exceeded and the soil quality geochemical grade was good.The main conclusions of the paper are as follows:(1)The fluoride content in the surface soil of the whole study area exceeded 550 mg / kg,reaching 560 mg / kg,the content was high.In the division of labor,the surface soil fluorine content: Huantai> Laiwu> Zhangqiu> Zaozhuang> Qingdao.Surface soil iodine content is moderate,2.57 mg / kg,the division of labor area,the surface soil iodine content: Laiwu> Huantai> Zaozhuang> Zhangqiu> Qingdao.(2)The fluorine content in the surface soil was negatively correlated with the sand content,The content of fluorine decreased with the increase of sand content in soil;The content of fluorine in the surface soil was positively correlated with the sum of the contents of powder and clay,and the fluorine content was increased with the increase of the content of powder and clay in the soil.The relationship between iodine and soil texture is consistent with fluoride.(3)pH in the range of 4-9,the content of F in surface soil was positively correlated with soil pH,and increased with the increase of pH,and the content of I increased with the increase of pH.(4)The content of F in soil increased with the increase of B,Cr,Cu,Se and Zn content.The content of I in surface soil was significantly positively correlated with the content of Se in soil,and increased with the increase of Se content,and increased with the increase of As and Mo.(5)The surface soil fluoride has inherited of soil parent material,to a certain extent has also been considered such as fertilization,irrigation and other factors,the research of each work area within the area of fluoride flux is positive,the fluorine content in soil gradually increased.The surface of iodine in soil mainly from soil parent materials,human activities such as coal combustion may also increase the iodine.(6)Based on the analysis of the soil environment and nutrient classification in the study area,the soil geochemical grade of the study area was first(clean)according to the "Land Quality Geochemical Evaluation Code",the soil geochemical grade was second(rich),soil Quality comprehensive level for the first class quality.