Analysis of Ionic Compounds Contained in Gaseous and Particulate Matter in Indoor Air by Ion Chromatography

The purpose of this study is actual a condition survey of the main acidic substances which are the cause of indoor air pollution, related to respiratory disease. We sampled actual indoor air using a low-volume air sampler, which allows the simultaneous classification sampling of gaseous and particulate matter. We also tried analyzing several acidic substances using ion chromatography (IC). First, we studied the sampling filter of gaseous or particulate matter. From the viewpoint of collection efficiency, a filter impregnated with 5 % (w/v) sodium hydroxide was adopted as a filter for the gaseous state. Several acidic substances were extracted from the gaseous and particulate filters, and the resultant solutions were injected into the IC. From the analytical results of the actual indoor air samples, we found that the existence form of the acidic substances differs depending on the sampling location, and it was possible to detect a small amount of the inorganic acidic substance.