Abstract
A classification of the “polarity” of porous polymer bead (PPB) stationary phases [Porapak and Chromosorb (Century Series)] with respect to standard polarity reference phases [squalane and C 87H 167 (Apolane)] was carried out by determination of the retention indices of Rohrschneider's and McReynolds' polarity probes (ethanol, butanol, benzene, pyridine, nitromethane, l-nitropropane, methyl ethyl ketone and methyl propyl ketone). Some PPBs have average polarity values lower than those of squalane and Apolane, whereas the most polar PPBs are comparable to medium polarity liquid stationary phases, e.g., methyl-, trifluoropropyl- and cyanopropylsilicones and some polyesters.
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