In recent years, the control of airborne ions has become one of the important research items of indoorenvironment. Generally, it is quite difficult to get the sample of airborne ions, because their electriccharge might be discharged if they touch any surface. The authors considered that it would be possibleto evaluate how many of the sampled molecules had existed as ions in air, if the relationship betweenairborne ions concentration and its adsorption rate to the surface was clarified.
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