[Dynamic pre-concentration method of gas sample].
Se Pu
; 19(1): 71-3, 2001 Jan.
Article
in Zh
| MEDLINE
| ID: mdl-12541851
ABSTRACT
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.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Specimen Handling
/
Chromatography, Gas
/
Ethylenes
Language:
Zh
Journal:
Se Pu
Year:
2001
Document type:
Article
Affiliation country: