Geochemical characteristics of selenium-rich soil in Shouning County of Fujian Province

Based on the analysis of selenium content in soil and agricultural products in the study area,the authors studied the distribu-tion characteristics and influencing factors of total selenium,and analyzed the characteristics of selenium content in agricultural prod-ucts. The results show that the selenium contents were controlled by the geological background. It was much higher in the Third and Fourth members of Jurassic Nanyuan formation than in other geological background regions.In addition,the contents of selenium in soil under different soil types showed a great difference,and the land use types also has a certain impact on it.The correlation analysis indi-cates that the selenium content in soil has a significant correlation with pH,organic matter and metal oxides such as TFe2O3,indicating that the physicochemical properties of soil play important roles in the geochemical behaviors of selenium. The significant correlation be-tween the selenium content and heavy metals indicates that there is a certain assorted relation between selenium and heavy metals in pri-mary sulfide mineral.