The uptake coefficient of I-2 on various aqueous surfaces

Uptake coefficient of I-2 on aqueous surfaces was measured by using an impi nging flow method. Dependence of the uptake coefficient on the gas-liquid c ontact time and pH was investigated. The uptake coefficient was (3.7 +/- 2. 0)x10(-4) at 120 ms, 293 K and pH = 5.6. In the alkaline region, the uptake coefficient was larger by one order of magnitude than that in the neutral and acidic region. The I-2 uptake on KI solutions and synthetic sea water s olutions was also measured. According to the analysis by the reactive uptak e model, the uptake of I-2 was shown to be mainly determined by liquid phas e reactions and the accommodation coefficient of I-2 on aqueous surfaces wa s estimated to be 0.01.