Although chromatographic systems are highly sensitive, it is also true that we must be concerned with concentrations of target materials and the detectability limit of the measurement system. Because of the relatively high concentrations of major air components in most of the studies, usually no further preconcentration of the analytes is necessary prior to chromatographic analysis. In some cases, sample volumes can even be reduced down to the level of /a1. Carbon dioxide and carbon monoxide can first be reduced to methane if a flame ionization detector (FID) coupled with gas chromatography (GC) is used. However, moisture is considered a major interference and shall
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