建立了一套用复合无机膜管捕集大气中挥发性有机物(VOCs)的实验室装置和流程,在此装置上研究了挥发性有机污染物(乙醇)浓度、气体流速对用无机膜管捕集VOCs的截留率的影响.结果表明,截留率随乙醇浓度的增大而增加,与乙醇浓度的关系符合Boltzmann分布;截留率随气体流速的减小而增加,与流速关系符合指数衰减的趋势.从改进膜管性能,使得膜管的毛细管冷凝作用成为截留挥发性有机污染物的主控阶段的角度,讨论了采用复合无机膜管捕集大气中VOCs的这种大气样品前处理新方法中潜在应用的可能性.
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