摘要
研究了纯水体系及柳州酸性降水中H_2O_2氧化S(Ⅳ)反应的动力学,并对柳州酸性降水中不同形态的S(Ⅳ)及有机弱酸的影响进行了详细的研究.此反应在纯水体系(pH3.90—4.85)和酸性降水体系(pH4.20—5.00)中具有十分相似的动力学性质.测得18℃三级反应速率常数k_3:纯水体系为(7.1±1.5)×10~7L^2mol^(-2)s^(-1),酸性降水体系为(5.3±2.6)×10~7L^2mol^(-2)s^-u.
A kinetic study of the oxidation of sulfur(Ⅳ) by hydrogen peroxide (H2O2) was performed in the media of pure water and acid precipitation at Liuzhou City, China. It is revealed that only free S (Ⅳ) can react with H2O2, while the S(Ⅳ) adduct of methanal does not take part in the reaction. The reactions in pure water and acid precipitation systems, over the pH ranges of 3.90-4.85 and 4.20-5.00 respectively, have the similar kinetic characteristics, The rate of the oxidation reaction can be expressed as -d[S (Ⅳ)]/dt = k3[H+] [S (Ⅳ)][H2O2]. The third-order rate constants for the pure water and acid precipitation systems were measured to be (7.1 ±1.5) × 107L2/mol2·s and (5.3±2.6) ×107L2/mol2·S, respectively.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1992年第1期58-67,共10页
Acta Scientiae Circumstantiae
基金
自然科学基金资助项目
关键词
反应动力学
酸雨
precipitation, oxidation kinetics, sulfur (Ⅳ), hydrogen peroxide.
