Abstract
The influences of coating thickness on Kováts' index was investigated. Five different thicknesses of Carbowax 20M were applied to glass capillary columns (50 m × 0.28 mm I.D.; coating film thickness, 0.041–0.45 μm) by the static coating method. The Kováts indices of alcohols (C 5-C 8), aldehydes (C 7-C 10) and ethyl esters (C 6-C 9) were measured on the five columns at 80°C and at 120°C. More variation in Kováts' index was observed for columns having thinner coating films measured at the lower temperature. Hydrocarbons were less influenced by differences in coating thickness than were alcohols, aldehydes and ethyl esters. The partition ratio of the tested solutes increased in proportion to the coating thickness.
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