[Dynamic pre-concentration method of gas sample].
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.
Miao
H
H
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116012, China.
Guan
Y F
YF
Wang
H W
HW
Zhu
D Q
DQ
D000042:Absorption; D000473:Alkanes; D001288:Attention; D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods*; D004980:Ethane / Q000032:analysis / Q000737:chemistry; D005030:Ethylenes / Q000032:analysis* / Q000737:chemistry; D013048:Specimen Handling / Q000379:methods*; D013696:Temperature
D000473:Alkanes; D005030:Ethylenes; C036216:ethylene; D004980:Ethane