CAJ | 학술논문

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(Ⅵ)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(Ⅵ)约有20%进入土壤固相，80%进入土壤溶液.在低Eh值(175 mV)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(Ⅵ)还原为Se(Ⅳ)，此还原反应符合动力学一级方程，半衰期为3.7 d.在高Eh值(450 mV)条件下，进入土壤溶液的硒在第一天70.9%呈Se(Ⅵ)态，且稳定；29.0%呈有机态，并在培养过程中先氧化成Se(Ⅳ)，然后Se(Ⅳ)再氧化成Se(Ⅵ).
이숙홍황니위시험재료，연구료재엄수배양과정중불동양화환원조건하외가Se(Ⅵ)재토양용액중적개태전화.결과표명，재량충토양Eh배양조건하，외가적Se(Ⅵ)약유20%진입토양고상，80%진입토양용액.재저Eh치(175 mV)조건하，진입토양용액적서약유90%정유궤태，차교은정；10%좌우적Se(Ⅵ)환원위Se(Ⅳ)，차환원반응부합동역학일급방정，반쇠기위3.7 d.재고Eh치(450 mV)조건하，진입토양용액적서재제일천70.9%정Se(Ⅵ)태，차은정；29.0%정유궤태，병재배양과정중선양화성Se(Ⅳ)，연후Se(Ⅳ)재양화성Se(Ⅵ).
Valence state transformation of added selenate in soil solution was studied by flooding incubation under the different redox potential conditions. The results show that 20 per cent of added selenate is transformed into soil solid and 80 per cent added selenate remains in soil solution under two redox potential conditions. At low redox potential (175 mV),90 per cent of selenium in soil solution exists as organic form,and is the stable species present in soil solution.About 10 per cent of selenate is reduced to selenite,at the first day which is a first order reaction with a half life of 3.7 days. At high redox potential (450 mV),70.9 per cent of selenium in soil solution exists as selenate at the first day,which is the stable species.29.0 per cent of selenium exists as organic form.As incubation proceeding,organic selenium is oxidized to selenite and selenite is rapidly oxidized to selenate.