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  • Title: Application of an integrated prepstation-GC-NPD system to automated continuous measurement of formaldehyde and acetaldehyde in the atmosphere.
    Author: Shiraishi T, Soma Y, Ishitani O, Sakamoto K.
    Journal: J Environ Monit; 2001 Dec; 3(6):654-60. PubMed ID: 11785641.
    Abstract:
    An integrated PrepStation-gas chromatography-nitrogen phosphorus detection (GC-NPD) system was used for the fully automated, continuous, low parts per billion analysis of lower aldehydes in the atmosphere. Analysis involved a solid phase extraction procedure based on the collection of aldehydes from air pumped through a silica gel cartridge impregnated with acidified 2,4-dinitrophenylhydrazine (DNPH). Automated continuous measurements were performed with a typical temporal resolution of 3 h, including 146 min for sampling of air at a constant air flow rate of 0.15 L min(-1) and 34 min for the preparation and extraction of several cartridges. Analysis of samples could be performed in parallel by using previously defined scheduler settings from separate, independent software to operate the PrepStation module. GC-NPD measurements were highly repeatable, and relative standard deviations were < 3.0%. Recoveries for all compounds were 88-101%. DNPH decomposition products did not adversely affect the quantitative determination of aldehyde DNPHs; therefore, it was not necessary to remove excess DNPH reagent. The limits of quantification (10sigma of the blank hydrazones) of formaldehyde and acetaldehyde were 2.2 and 1.2 ppb, respectively, for 21.9 L (0.15 L min(-1) for 146 min) of air sample volume. The integrated PrepStation GC-NPD system gave results comparable to those of the Sep-Pak DNPH silica cartridge method.
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