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本文以广州雨水为基体,采用经典化学动力学实验方法模拟雨水中S(Ⅳ)与O_3的氧化反应,用离子色谱法测定反应在不同时间S(Ⅳ)的浓度.结果表明,在[S(Ⅳ)](?)[O_3]时,该反应为准一级反应.反应速度常数k与文献中所列举的HSO_3~-与O_3反应的速度常数k_1的数值相一致.不同温度下的反应速度常数k_T分别为:5.6×10~4L·mol~(-1)·S~(-1)(5℃),9.8×10~4L·mol~(-1)·S~(-1)(10℃),1.5×10~5L·mol~(-1)·s~(-1)(15℃)和2.0×10~5L·mol~(-1)·s~(-1)(20℃).上述结果完全符合阿累尼乌斯方程,由此公式计算出的表观活化能E_3=56.1KJ·mol~(-1)·K~(-1).
In this paper, the rainwater in Guangzhou was used as the substrate, the oxidation reaction of S (Ⅳ) and O_3 in rainwater was simulated by the classical chemical kinetics experiment method, and the concentration of S (Ⅳ) at different time was determined by ion chromatography.The results showed that in S The reaction is quasi-first-order, and the reaction rate constant k is consistent with the values of the rate constants k_1 of HSO_3 ~ - and O_3 reactions listed in the literature. The reaction rates at different temperatures The constants k_T were 5.6 × 10 ~ 4L · mol -1 · s -1 · 5 ℃ and 9.8 × 10 -4L · mol -1 -1 ℃, 1.5 × 10-5L · mol -1 s -1 and 15 ℃ respectively, and 2.0 × 10 -5L · mol -1 s -1 at 20 ℃. The above results are in good agreement with the Arrhenius equation, and the calculated apparent activation energy E_3 = 56.1 KJ · mol -1 K -1.