Total selenium content of agricultural soils in Japan(Soil Chemistry and Soil Mineralogy)

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To evaluate the selenium (Se) level in agricultural soils in Japan and to investigate its determining factors, 180 soil samples were collected from the surface layer of paddy or upland fields in Japan and their total Se contents were determined. Finely ground soil (50mg) was wet-digested with HNO_3 and HClO_4 solution and the released Se was reduced to Se (IV). The concentration of Se (IV) was then determined by high-performance liquid chromatography with a fluorescence detector after treatment with 2,3-diaminonaphthalene and extraction with cyclohexane. The total Se content ranged from 0.05 to 2.80mg kg^<-1> with geometric and arithmetic means of 0.43 and 0.51mg kg^<-1>, respectively. The overall data showed a log-normal distribution. In terms of soil type, volcanic soils and peat soils had relatively high Se content and regosols and gray lowland soils had relatively low Se content. In terms of land use, upland soils had significantly higher Se content than paddy soils. Among regions, soils in the Kanto, Tohoku, Hokkaido and Kyushu regions had relatively high content. The total Se content had a significant positive correlation with the organic carbon content (P<0.01) and the equation for the estimation of total Se content with organic carbon suggested that on average approximately 48% (0.24mg kg^<-1>) of the total Se was in inorganic forms and approximately 52% (0.25mg kg^<-1>) was in organic forms. Soil pH, on the contrary, did not show a significant relationship with the total Se content. In conclusion, the organic matter content, in combination with volcanic materials, was the main determining factor of the total Se content of agricultural soils in Japan.
社団法人日本土壌肥料学会の論文

Total selenium content of agricultural soils in Japan(Soil Chemistry and Soil Mineralogy)

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