TY  - JOUR
TT  - The Determination of Background Levels of Volatile Organic Compounds in Atmosphere
AU  - Weber, Marjan
AU  - Pompe, M.
AU  - Basa, H.
PY  - 2001
DA  - June
JF  - Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi
JO  - BAUN Fen. Bil. Enst. Dergisi
PB  - Balıkesir University
WT  - DergiPark
SN  - 1301-7985
SP  - 125
EP  - 147
VL  - 3
IS  - 1
N2  - Volatile organic compounds (VOCs) of anthropogenic as well as biogenic origin play an important role in different photochemical processes in the troposphere. In order to evaluate their impact on ozone formation processes, a detailed knowledge about their abundance in the atmosphere is required. There are several different analytical methods available for the determination of background levels if VOC in the air. Sampling can be performed either collecting the whole sample (e.g. canister, bags) or by preconcentration on absorption tubes or cold traps. For their determination gas chromatography using different detectors (FID, ECD, MSD) is applied. The absorption tubes filled with different adsorption materials (i.e.Tenax, Carbotrap, Carbosieve,) to collect VOC from C to Capplied and the absorption efficiency of individual absorbents was tested. Special attention was dedicated to the sampling of biogenic compounds.The samples were cryo-refocused after thermal desorption andinjected on gas-chromatographic capillary column. Two separationmethods were developed. The first one includes separation of C2 to C10isomers using nonpolar OV-1 column. Baseline separation of C2isomers was obtained by cooling the chromatographic oven to -60o C. To avoid multiple overlapping of chromatographic peaks two-columnsystem was developed. While Al2O3/KCl PLOT column was used forthe separation of high volatile VOCs (C2 to C6) lower volatile VOCwere separated using nonpolar DB-5MS column. The identification of VOC was performedusing several standards and MS detector, while quantitative results wereobtained with FID detector.Since unspecific fragmentations in the homologous series canhinder identification of the unknown substances during gaschromatographic separation coupled with mass spectrometry, somechemometric approaches have been introduced to solve this problem.The accuracy of the developed methods was performed by comparisonof results obtained by different laboratories during field measurements.
UR  - https://dergipark.org.tr/en/pub/baunfbed/issue//261886
L1  - https://dergipark.org.tr/en/download/article-file/228405
ER  -