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Coupled LC-GC: Evaporation rates for partially concurrent eluent evaporation using an early solvent vapor exit

✍ Scribed by Schmarr, Hans-Georg ;Mosandl, Armin ;Grob, Konrad

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 617 KB
Volume: 12
Category: Article
ISSN: 0935-6304
DOI: 10.1002/jhrc.1240121106

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✦ Synopsis

Partially concurrent eluent evaporation presupposes an eluent

1.2 Early Vapor Exit evaporation rate in the GC pretolumn that approaches the LC flow rate. Discharging the vapors through the whole GC column, evaporation rates reach 10-30 pl/min, i.e. are suitable just for LC flow rates typical for packed capillary LC columns. With an early vapor exit, evaporation rates are increased to 100-200 pl/min (under extreme conditions to some 800 pllmin), thus fitting the LC flow rates of 2 mm i.d. columns. Evaporation rates were measured for a standard set of precolumns and conditions.The dependence of the evaporation rate on temperature, inlet pressure, carrier gas, and internal diameter of the retaining pre-column are discussed in order to allow the design of a GC system producing a desired evaporation rate. K Grob a n d E Muller, HRC & CC 11 (1988) 388 a n d 560 K Grob a n d E Muller, J Chromatogr , in press

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