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Redox potential EH [Se(VI)/Se(IV)] of aqueous extractof soils from Yongshou Kaschin-Beck diseaseregion and the influence by humic acid
作者姓名:Peng An  Xu Langqiu
作者单位:Research Center for Eco-Environmental Sciences;Academia Sinica;Beijing 100083;China,Research Center for Eco-Environmental Sciences;Academia Sinica;Beijing 100083;China
摘    要:The relation between EH [Se(VI)/Se(IV)] and pH of soil aqueous extract in Kaschin-Beck disease region and the effects of natural redox agents, namely humic substances, MnO2 and Fe2+, on the redox property of the system were studied. The results indicated that both humic acid and Fe2+ could enhance the reducibility of Se(VI) and MnO2, a limited oxidizability for Se(IV). Fe2+ showed a weak reducibility only at low pH value. The reducibilities of three sulfur-containing compounds for Se(VI) were in following order:thioglycollic acid > L-cysteine > sulfide

关 键 词:selenium  redox potential  Kaschin-Beck disease  humic acid.
收稿时间:1989-02-23
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