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Uptake of Gas-Phase SO_2, H_2S, and CO_2 by Aqueous Solutions

机译:水溶液对气相SO_2,H_2S和CO_2的吸收

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The uptake of gas-phase SO_2, H_2S, and CO_2 by aqueous solutinos was studied as a function of pH and temperature using droplet train flow reactor and bubble train reactor apparatuses. All three atmospheric species react with H_2O and OH~-, acidifying aqueous solutions. Studies yielded the reaction rates of SO_2, H_2S, and CO_2 with OH~- and the mass accommodation coefficient (#alpha#) of SO_2 on water as a function of temperature, The second-order aqueous-phase rate coefficients at 291 K for SO_2, H_2S nad CO_2 reaction with OH~- are (1.1+-0.2)×10~10, (1.7+-0.2)×10~9, and (4.0+-0.7)×10~3 M~(-1) s~(-1), respectively. As far as we can determine, the rate coefficients for SO_2 and H_2S have been determined here for the firs time. At 291 K, for SO_2, #alpha#=0.175+-0.015, and as in previous studies, the temperature dependence of #alpha# is well represented by the relationship #alpha#/(1-#alpha#)=exp(-(triangle open)G_obs/RT) with (triangle open)H_obs=-7.6+-0.6 kcal mol~(-1) and (triangle open)S_obs=-29.2+-2.1 cal mol~(-1) K~(-1).
机译:使用液滴列式流动反应器和气泡列式反应器设备研究了水溶液中的水lut溶胶对气相SO_2,H_2S和CO_2的吸收随pH和温度的变化。所有这三种大气物质都与H_2O和OH〜-反应,从而酸化水溶液。研究得出SO_2,H_2S和CO_2与OH〜-的反应速率以及SO_2在水上的质量调节系数(#alpha#)与温度的关系,SO_2在291 K下的二阶水相速率系数,H_2S和CO_2与OH〜-的反应分别为(1.1 + -0.2)×10〜10,(1.7 + -0.2)×10〜9和(4.0 + -0.7)×10〜3 M〜(-1)s 〜(-1)。据我们所确定,此处已确定了第一时间的SO_2和H_2S的速率系数。在291 K下,对于SO_2,#alpha#= 0.175 + -0.015,并且像以前的研究一样,通过关系#alpha#/(1-#alpha#)= exp(- (三角形开口)G_obs / RT),其中(三角形开口)H_obs = -7.6 + -0.6 kcal mol〜(-1)和(三角形开口)S_obs = -29.2 + -2.1 cal mol〜(-1)K〜(- 1)。

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