Measurement of Henry coefficients by capillary columns coated with slightly polar solvents

Abstract

SummaryThe specific retention volumes and Henry coefficients measured on packed columns are compared with those calculated via retention indices determined on wall coated open tubular capillary columns. The stationary phase liquids used were derivatives of a branched paraffin, C7~H158, where a methyl or ethyl group of the paraffin was replaced by OH, CN, OCH 3 and SH groups. The retention indices of a series of molecular probes of varying polarity (aromatics, 1-chloroalkanes, 1-acetoxy-alkanes, 1-alkanols, 2-alkanones) were determined at T = 403.15 K on fused-silica open tubular columns prepared by static coating that gave stable and uniform solvent films. After obtaining the absolute data on packed columns for n-alkanes, the specific retention volumes and Henry coefficients of the solutes were calculated. The retention data obtained on both columns showed good agreement.

Field desorption mass spectrometry of large multiply branched saturated Hydrocarbons

“…1). 1–3 These branched alkanes can be used as stationary phases for GC in packed and capillary columns4 and as solvents for thermodynamic investigations of non‐specific molecular interactions 5–7. Limiting activity coefficients in volatile alkane solvents at ambient temperatures for solutes of various polarities can be predicted from GC retention data obtained with the Apolane family members at higher temperatures 8…”