A. Castellnou et al., REFRIGERATED MULTIBED ADSORPTION IN SAMPLING AND ANALYSIS OF ATMOSPHERIC LIGHT-HYDROCARBONS AT PPB (V V) AND SUB-PPB (V/V) CONCENTRATIONS/, Journal of chromatography, 778(1-2), 1997, pp. 269-277
Citations number
31
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
Higher ppb (v/v) and sub-ppb (v/v) concentrations of airborne C-2-C-8
light hydrocarbons are obtained when analyzed by refrigerated (-10 deg
rees C) vs. ambient temperature cartridges filled with a combination o
f carbonaceous packings. The quantitative differences essentially conc
ern some of the lower molecular weight compounds present in higher con
centrations, e.g., ethane and propane, as well as toluene. These resul
ts have been evidenced from a field comparison involving parallel samp
lings with both refrigerated and ambient temperature systems and canis
ter collection for reference. The site selected for study is a semi-ur
ban area receiving low traffic pollution inputs. The concentrations pr
ovided by these refrigerated tubes are close to those obtained with th
e canister which is the sampling method giving the highest concentrati
on values in a larger number of compounds. (C) 1997 Elsevier Science B
.V.