Role of chromium and vanadium in the atmospheric oxidation of sulfur(IV)

被引：23

作者：

Brandt, C ^{[1
]}

Elding, LI ^{[1
]}

机构：

[1] Univ Lund, Ctr Chem, S-22100 Lund, Sweden

来源：

ATMOSPHERIC ENVIRONMENT | 1998年 / 32卷 / 04期

关键词：

transition metals; tropospheric aqueous phase; catalysis; kinetics; mechanism;

D O I：

10.1016/S1352-2310(97)00331-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 [工学]; 0830 [环境科学与工程];

摘要：

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.

引用

页码：797 / 800

页数：4

共 34 条

[1]

*ZUR THEORIE DER OXYDATION VON SULFIT ZU SULFAT DURCH SAUERSTOFF [J].