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  • Combination of sorption tube sampling and thermal desorption with hollow waveguide FT-IR spectroscopy for atmospheric trace gas analysis: determination of atmospheric ethene at the lower ppb level.

Combination of sorption tube sampling and thermal desorption with hollow waveguide FT-IR spectroscopy for atmospheric trace gas analysis: determination of atmospheric ethene at the lower ppb level.

Analytical chemistry (2004-01-15)
Olga A Pogodina, Victor V Pustogov, Fabiano de Melas, Christina Haberhauer-Troyer, Erwin Rosenberg, Hans Puxbaum, Alexandra Inberg, Nathan Croitoru, Boris Mizaikoff
摘要

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 approximately 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 approximately 1 ppb are reported. Efficient enrichment by the sampling tube is achieved due to the favorable internal volume ( approximately 0.4 cm(3) 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.

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Supelco
Carbosieve 吸附剂, matrix Carbosieve S-III, 60-80 mesh, bottle of 10 g
Supelco
Carbosieve 吸附剂, matrix Carbosieve G, 60-80 mesh, bottle of 5 g
Supelco
Carbosieve 吸附剂, matrix Carbosieve S-II, 60-80 mesh, bottle of 10 g
Supelco
Carbosieve 吸附剂, matrix Carbosieve S-II, 80-100 mesh, bottle of 10 g
Supelco
Carbosieve SIII, stainless steel TD tube, O.D. × I.D. × L 6 mm × 4 mm × 7 in., preconditioned, pkg of 1 ea
Supelco
Carbosieve 吸附剂, matrix Carbosieve G, 80-100 mesh, bottle of 5 g