Dynamic pre-concentration method of gas sample
Miao, H.; Guan, Y.F.; Wang, H.W.; Zhu, D.Q.
Se Pu 19(1): 71-73
2001
ISSN/ISBN: 1000-8713 PMID: 12541851 Document Number: 538794
By utilizing the combination of frontal chromatography at ambient temperature, back-flushing and temperature gradient thermal desorption, a prototype of a dynamic pre-concentration system has been designed and evaluated. It realized the enrichment for gas samples of boiling point higher than - 103 degrees C without cryogenic facilities. To reduce the sample volume and enhance enrichment factor, the technique of momentarily non-steady state produced at the beginning of back-flushing, and the negative temperature gradient generated during thermal desorption were utilized, resulting a very sharp desorption band. Standard samples were tested to demonstrate the applicability of the method. At 10 mL sample volume, the enrichment factor was 100.