Adsorption of water vapour from humid air by selected carbon adsorbents

Suitability of different polymer bags for storage of volatile sulphur compounds relevant to breath analysis

“…Tedlar [27,28,34]) and some analytical problems during the gas chromatographic analysis of VSCs in humidified samples. The most commonly reported humidity effects are: decrease of the adsorption capacity of the sorbents, plugging of cold traps at sub-zero temperatures and retention time variations in the case of the sorbent trapping [21,38,39], and decrease of the extraction efficiency in the SPME [35]. The last effect was also observed during our studies and was particularly severe for H 2 S, COS, MeSH and EtSH (80% efficiency drop) [41].…”

Improved pre-concentration and detection methods for volatile sulphur breath constituents

“…Humidity of breath samples strongly affects the GC analyses of VSCs. The most undesirable effects are: decrease of the sorbents adsorption capacity, plugging of cold traps, retention time variations and decrease of the extraction efficiency in SPME [15,23,34,35]. Several methods of water removal have been proposed to avoid these effects.…”

Toluene photocatalytic oxidation at ppbv levels: Kinetic investigation and carbon balance determination

“…Dry air corresponding analytical parameters are listed in Table 1. For wet air experiments (15 500 ppmv H 2 O), a multi-bed cartridge composed of three hydrophobic sorbents (Carbopack X, Carbopack B, Carbopack C) was used in order to prevent water trapping [19,20]. Likewise, the sampling temperature was set to 15 • C for these experiments.…”