TY - JOUR
T1 - Combination of Sorption Tube Sampling and Thermal Desorption with Hollow Waveguide FT-IR Spectroscopy for Atmospheric Trace Gas Analysis
T2 - Determination of Atmospheric Ethene at the Lower ppb Level
AU - Pogodina, Olga A.
AU - Pustogov, Victor V.
AU - De Melas, Fabiano
AU - Haberhauer-Troyer, Christina
AU - Rosenberg, Erwin
AU - Puxbaum, Hans
AU - Inberg, Alexandra
AU - Croitoru, Nathan
AU - Mizaikoff, Boris
PY - 2004/1/12
Y1 - 2004/1/12
N2 - The determination of organic trace gases in the ambient environment at the lower ppb level is demonstrated based on a novel technique combining sorption tube sampling on Molsieve and Carbosieve S-III, thermal desorption, and detection of the trace analyte by hollow waveguide Fourier transform infrared (HWG-FT-IR) spectroscopy. While ethene concentrations of ∼5 ppm can be directly observed using HWG-FT-IR, enrichment factors of up to 5000 were achieved by sorption tube sampling and thermal desorption. Detection limits of ∼1 ppb are reported. Efficient enrichment by the sampling tube is achieved due to the favorable internal volume (∼0.4 cm3 at a length of 470 mm) of the hollow waveguide serving as a miniaturized gas cell. This new method was validated for ethene by thermodesorption-cryofocusing-GC-FID as the reference method. Analytical performance has been compared for standard gas mixtures and for ethene measurements in urban air. Finally, ethene data from a sampling campaign at two alpine sites in Tyrol/Austria are presented.
AB - The determination of organic trace gases in the ambient environment at the lower ppb level is demonstrated based on a novel technique combining sorption tube sampling on Molsieve and Carbosieve S-III, thermal desorption, and detection of the trace analyte by hollow waveguide Fourier transform infrared (HWG-FT-IR) spectroscopy. While ethene concentrations of ∼5 ppm can be directly observed using HWG-FT-IR, enrichment factors of up to 5000 were achieved by sorption tube sampling and thermal desorption. Detection limits of ∼1 ppb are reported. Efficient enrichment by the sampling tube is achieved due to the favorable internal volume (∼0.4 cm3 at a length of 470 mm) of the hollow waveguide serving as a miniaturized gas cell. This new method was validated for ethene by thermodesorption-cryofocusing-GC-FID as the reference method. Analytical performance has been compared for standard gas mixtures and for ethene measurements in urban air. Finally, ethene data from a sampling campaign at two alpine sites in Tyrol/Austria are presented.
UR - http://www.scopus.com/inward/record.url?scp=0345866719&partnerID=8YFLogxK
U2 - 10.1021/ac034396j
DO - 10.1021/ac034396j
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AN - SCOPUS:0345866719
SN - 0003-2700
VL - 76
SP - 464
EP - 468
JO - Analytical Chemistry
JF - Analytical Chemistry
IS - 2
ER -
