Role of chromium and vanadium in the atmospheric oxidation of sulfur(IV)
Role of chromium and vanadium in the atmospheric oxidation of sulfur(IV)
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DOI：
10.1016/s1352-2310(97)00331-2
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发表时间：
1998-02-01
影响因子：
5
通讯作者：
Elding, LI
中科院分区：
文献类型：
--
作者：
Brandt, C;Elding, LI
研究了在钒(V)、铬(III)和铬(VI)存在下，HSO3-在水溶液中的氧化。根据分光光度动力学数据和产物分析，得出钒(V)和铬(III)的存在不影响硫(IV)在弱酸性溶液中的自氧化速率。另一方面，铬酸盐(VI)在酸性溶液中以直接氧化还原过程氧化硫(IV)。该反应的总速度随着pH的增加而降低，在与大气有关的pH范围4-6内变得相对缓慢。此外，在大气水相中，铬(III)比铬(VI)具有更强的优势。因此，在大多数大气环境条件下，钒、钒和铬的阳离子对硫(IV)的大气水相氧化没有显著影响。只有在酸性很强的液滴中，铬(VI)和亚硫酸盐之间的直接氧化还原可能具有一定的重要性。(C)1998爱思唯尔科学有限公司。保留所有权利。
Oxidation of HSO3- in aqueous solution has been studied in the presence of vanadium(V), chromium(III) and chromium(VI). Based on spectrophotometric kinetics data and product analysis it is concluded that the autoxidation rate of sulfur(IV) in slightly acidic solution is unaffected by the presence of vanadium(V) and chromium(III). Chromate(VI), on the other hand, oxidizes sulfur(IV) in a direct redox process in acidic solution. The overall rate of this reaction decreases with increasing pH and it becomes relatively slow in the atmospherically relevant pH range 4-6. Moreover, chromium(III) dominates strongly over chromium(VI) in the atmospheric aqueous phase. Hence, it is concluded that cations of vanadium vanadium and chromium have no significant influence on the atmospheric aqueous-phase oxidation of sulfur(IV) under most ambient atmospheric conditions. Only in very acidic droplets, direct redox between chromium(VI) and sulfite might be of some importance. (C) 1998 Elsevier Science Ltd. All rights reserved.