Purge and trap method to determine alpha factors of VOC liquid-phase mass transfer coefficients  

作　　者：S.C.Lee L.Y.Chan C.Y.Chan 

机构地区：[1]Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,China Correspondence should be addressed to Wang Xinming,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,China Correspondence should be addressed to Wang Xinming,Department of Civil & Structural Engineering,The Hong Kong Polytechnic University,Hong Kong,China Correspondence should be addressed to Wang Xinming

出　　处：《Chinese Science Bulletin》2000年第S1期76-79,共4页

摘　　要：A theoretical approach and laboratory practice of determining the alpha factors of volatile organic compound (VOC) liquid-phase mass transfer coefficients are present in this study. Using Purge & Trap Concentrator, VOC spiked water samples are purged by high-purity nitrogen in the laboratory, the VOC liquid-phase mass transfer rate constants under the laboratory conditions are then obtained by observing the variation of VOCs purged out of the water with the purge time. The alpha factors of VOC liquid-phase mass transfer coefficients are calculated as the ratios of the liquid-phase mass transfer rate constants in real water samples to their counterparts in pure water under the same experimental conditions. This direct and fast approach is easy to control in the laboratory, and would benefit mutual comparison among researchers, so might be useful for the study of VOC mass transfer across the liquid-gas interface.A theoretical approach and laboratory practice of determining the alpha factors of volatile organic compound (VOC) liquid-phase mass transfer coefficients are present in this study. Using Purge & Trap Concentrator, VOC spiked water samples are purged by high-purity nitrogen in the laboratory, the VOC liquid-phase mass transfer rate constants under the laboratory conditions are then obtained by observing the variation of VOCs purged out of the water with the purge time. The alpha factors of VOC liquid-phase mass transfer coefficients are calculated as the ratios of the liquid-phase mass transfer rate constants in real water samples to their counterparts in pure water under the same experimental conditions. This direct and fast approach is easy to control in the laboratory, and would benefit mutual comparison among researchers, so might be useful for the study of VOC mass transfer across the liquid-gas interface.

关 键 词：mass transfer COEFFICIENT PURGE and TRAP VOLATILE organic compounds ALPHA factor. 

分 类 号：P595[天文地球—地球化学]