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以熟红黄泥为试验材料 ,研究了在淹水培养过程中不同氧化还原条件下外加 Se( )在土壤溶液中的价态转化 .结果表明 ,在两种土壤 Eh培养条件下 ,外加的 Se( )约有 2 0 %进入土壤固相 ,80 %进入土壤溶液 .在低 Eh值 (175 m V)条件下 ,进入土壤溶液的硒约有 90 %呈有机态 ,且较稳定 ;10 %左右的 Se( )还原为 Se( ) ,此还原反应符合动力学一级方程 ,半衰期为 3.7d.在高 Eh值 (4 5 0 m V)条件下 ,进入土壤溶液的硒在第一天 70 .9%呈Se( )态 ,且稳定 ;2 9.0 %呈有机态 ,并在培养过程中先氧化成 Se( ) ,然后 Se( )再氧化成 Se( )
The ripening red yellow mud was used as the experimental material to study the valence transformation of Se (superscript +) in soil solution under different redox conditions during the flooding culture. The results showed that the Se (About 20%) enters the soil solid phase and 80% enters the soil solution. At low Eh (175 mV), about 90% of the selenium entering the soil solution is organic and stable; about 10% Se () reduced to Se (), the reduction reaction was in accordance with the kinetic first order equation with a half-life of 3.7 days, and the selenium entering the soil solution at the high Eh (450 mV) 9% was Se () state, and stable; 2 9.0% was organic and oxidized to Se () during the culture process, then Se