Kinetics of ammonia and ammonium ion inhibition of the atmospheric oxidation of aqueous sulfur dioxide by oxygen期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

首页 | 本学科首页

官方微博 | 高级检索

按检索

Kinetics of ammonia and ammonium ion inhibition of the atmospheric oxidation of aqueous sulfur dioxide by oxygen

Authors:

Punit Kumar Mudgal Anil Kumar Sharma C D Mishra S P Bansal K S Gupta

Institution:

(1) Atmospheric Chemistry Lab, Department of Chemistry, University of Rajasthan, Jaipur, 302 004, India

Abstract:

This is the first study, which shows both NH₃ and NH₄⁺ to inhibit the autoxidation of aqueous SO₂ in the pH range 7.0–8.5. The rate of the autoxidation, R _aut, in both buffered and unbuffered media at a fixed pH is in conformity with the rate law:

$R_{aut} ={{R_0 } \mathord{\left/ {\vphantom {{R_0 } {\left( {{\text{1 + }}B\left {\text{Inh}} \right]_{\text{T}} } \right)}}} \right. } {\left( {{\text{1 + }}B\left {\text{Inh}} \right]_{\text{T}} } \right)}}$

where R ₀ is rate in the absence of the inhibitors, B is a pH dependent empirical constant and Inh]_T is the analytical concentration of NH₃ or NH₄⁺. Both ammonia and ammonium ions appear to inhibit the autoxidation either by scavenging SO₄⁻ radicals or by forming less-reactive /unreactive Co(II)-NH₃ complexes or both. The atmospheric relevance of the inhibition by ammonia and ammonium ions is discussed.

Keywords:

Ammonia Ammonium ion Sulfur(IV) Metal ions Autoxidation Inhibition Kinetics

本文献已被 SpringerLink 等数据库收录！

设为首页 | 免责声明 | 关于勤云 | 加入收藏