Jump to main content
Jump to site search

Issue 3, 2005
Previous Article Next Article

24 h diffusive sampling of toxic VOCs in air onto Carbopack X solid adsorbent followed by thermal desorption/GC/MS analysis—laboratory studies

Author affiliations

Abstract

Diffusive sampling of a mixture of 42 volatile organic compounds (VOCs) in humidified, purified air onto the solid adsorbent Carbopack X was evaluated under controlled laboratory conditions. The evaluation included variations in sample air temperature, relative humidity and ozone concentration. Linearity of samples with loading was examined both for a constant concentration with time varied up to 24 h and for different concentrations over 24 h. Reverse diffusion and its increase with accumulation of sample were determined for all compounds. Tubes were examined for blank levels, change of blanks with storage time, and variability of blanks. Method detection limits were determined based on seven replicate samples. Based on this evaluation, 27 VOCs were selected for quantitative monitoring in the concentration range from approximately 0.1 to 4 ppbv. Comparison results of active and diffusive samples taken over 24 h and under the same simulated ambient conditions at a constant 2 ppbv were interpreted to estimate the effective diffusive sampling rates (ml min−1) and their uncertainties and to calculate the corresponding diffusive uptake rates (ng ppmv−1 min−1).

Graphical abstract: 24 h diffusive sampling of toxic VOCs in air onto Carbopack X solid adsorbent followed by thermal desorption/GC/MS analysis—laboratory studies

Back to tab navigation

Supplementary files

Publication details

The article was received on 09 Aug 2004, accepted on 15 Dec 2004 and first published on 26 Jan 2005


Article type: Paper
DOI: 10.1039/B412213E
Citation: J. Environ. Monit., 2005,7, 248-256
  •   Request permissions

    24 h diffusive sampling of toxic VOCs in air onto Carbopack X solid adsorbent followed by thermal desorption/GC/MS analysis—laboratory studies

    W. A. McClenny, K. D. Oliver, H. H. Jacumin Jr, E. H. Daughtrey Jr and D. A. Whitaker, J. Environ. Monit., 2005, 7, 248
    DOI: 10.1039/B412213E

Search articles by author

Spotlight

Advertisements