Temperature Dependence Study of Several Polarity Scales Used in Gas—Liquid Chromatography Stationary Phase Characterization
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...
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Published in | Journal of chromatographic science Vol. 37; no. 4; pp. 113 - 120 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Niles, IL
Oxford University Press
01.04.1999
Preston Publications |
Subjects | |
Online Access | Get full text |
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Summary: | 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 In 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 In 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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Bibliography: | istex:69B51D199CF3C2DD2FA9E04773036DC50B4D95A9 ark:/67375/HXZ-9XCZGGN2-B Author to whom correspondence should be addressed. |
ISSN: | 0021-9665 1945-239X |
DOI: | 10.1093/chromsci/37.4.113 |