Chemical forms and stability of selenium in soil
1998
Yamada, H. (Kyoto Prefectural Univ. (Japan). Faculty of Agriculture) | Kang, Y. | Aso, T. | Uesugi, H. | Fujimura, T. | Yonebayashi, K.
The chemical forms of selenium (Se) in soils derived from different parent rocks, and the stability of Se species in soils were investigated. Around 40% of the total Se occurred as organic Se on the average. Total selenite content was higher than that of total selenate. The content of organic Se decreased with heating of the soils at high temperatures, and most of it disappeared at heating temperatures above 500 degrees C. However, the results of incubation experiments indicated that Se species were stable in soil, and the their chemical forms did not change appreciably with the variation of soil conditions. Insoluble Se, organic Se accounted for about 50%, and in contrast to the total Se, the selenate content was higher than that of selenite
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