O-(2,3,4,5,6-Pentafluorobenzyl)hydroxylamine含浸シリカゲル捕集-溶媒抽出ガスクロマトグラフ法による室内空気中のアルデヒド類の定量

Abstract

A gas chromatographic method using an electron capture detector is described for the determination of aldehydes in indoor air samples. It consists of the following three procedures ; (1) collection of aldehydes as O-(2, 3, 4, 5, 6-pentafluorobenzyl) hydroxylamine (PFBOA) derivatives on a 5% H3PO4-silica gel sorbent, (2) desorption of their aldehydes from the sorbent with a benzene solution, and (3) quantitative determination of the aldehyde derivatives by GC equipped with an electron capture detector. The recoveries of aldehydes from the air samples through the entire analytical procedures amounted to more than 90%. The calibration curves for fluoro derivatives of aldehydes were linear in the range from 0 to 200 pg per milliliter of benzene for each free aldehyde. The lower detection limits for formaldehyde and acetaldehyde were 2 and 3μg/m3, respectively. This method has been applied to aldehydes in indoor air samples. Formaldehyde and acetaldehyde were found in the air samples in the levels of 4.7-246 and 4.4-24.3μg/m3, respectively. The presence of vareraldehyde and capronaldehyde was also revealed in the indoor air samples.