Published: Journal of Chromatographic Science, Volume 37, Number 4, April 1999, pp. 113-120.
Temperature Dependence Study of Several Polarity Scales Used
in Gas–Liquid Chromatography Stationary Phase Characterization
José M. Santiuste and József M. Takács
Substance-specific factors (SPFk), average polarity factors (APF), retention polarities (RP), McReynolds polarities (MP), and effective polarities (P) for 26 stationary phases spanning the entire range of polarity were recently determined at 120°C. Here, their temperature dependence for 8 stationary phases and the first 5 McReynolds probes at the 60–150°C temperature range is studied. A very good correlation between ln SPF versus temperature is found for most cases. Decreasing straight lines are obtained for benzene, pentan-2-one, and pyridine, and increasing straight lines are obtained for n-butanol and 1-nitropropane. Regarding ln APF versus temperature dependence, a linear correlation is merely adequate for Squalane (coefficient of regression r2 = 0.9999) and XF-1150 (r2 = 0.9944) and somewhat worse for TFPS35 (r2 = 0.9249) and OV-101 (r2=0.9023); the variation for the rest of the trifluoropropyl siloxanes is negligible, and straight lines quasi-parallel to the temperature axum are obtained. The correlation with temperature is very good for the Kováts coefficient but rather unequal for RP, MP, and P.
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