Abstract
We have developed an analytical method fbr trace amount of carbonyls in indoors and ourdoors. This method consists of sampling of carbonyls with passive sampler, solvent extraction, HPLC/spectrometer with large-volume-injection method. The method detection limits of 6 detected carbonyls(Formaldehyde, Acetaldehyde, Acetone, Propionaldehyde, Benzaldehyde, n-Hexanal)were 0.001-0.007μg/m3. We have also determined indoor and outdoor concentration of carbonyls using developed method. Sampling locations were 22 and 21 public facilities including libraries and schools, in 2005 and 2006, respectively. Forty one houses were also investigated. The six carbonyls were detected in this study. Formaldehyde concentrations of 11 out of 294 sampling points in the public facilities exceeded the indoor air quality guideline(100μg/m3)of Ministry of Health, Labour and Welfare, Japan. These of 13 out of 397 sampling points in the households exceeded the guideline. Acetaldehyde concentration of 19 out of 397 sampling points in the households exceeded the indoor air quality guideline(48μg/m3) of Ministry of Health, Labour and Welfare, Japan. In the public facilities, formaldehyde concentrations in winter is significantly lower than those in summer, but in households those in winter is not so much lower than those in summer. This is mainly because indoor temperatures in households were high in night time. No correlation between fbmlaldehyde and other aldehydes concentrations were found, but significant correlations were fbund among acetaldehyde, acetone and hexanal concentratlons.
