Evaluation of vaporization enthalpies and liquid vapor pressures of cedrol, nerolidol, and 1-adamantanol by correlation gas chromatography

Estimating Vapor Pressure Data from Gas–Liquid Chromatography Retention Times: Analysis of Multiple Reference Approaches, Review of Prior Applications, and Outlook

“…Note that the four-parameter Cox equation had to be used by Pokorný et al for 1-alkanols (three parameters were sufficient for n -alkanes). An insufficient number of parameters may however only partly explain significant differences between data near the T nbp from Ambrose and co-workers fitted by Chebyshev polynomials (or Wagner equation) and data calculated by means of eq . ,− We have fitted vapor pressures of 1-decanol from the same sources as Nichols et al using eq with four parameters and obtained significantly smaller deviations from original vapor pressures p 0 than Nichols et al (see Figure ). Incorrect refitting of original p 0 by means of eq is thus unexpectedly another source of additional uncertainty associated with the CGC methodology (this problem may have been avoided if original equations for reference compounds had been used).…”

“…Inclusion of experimental vapor pressures at low pressures not accessible by ebulliometry might be therefore helpful. In comparison to Nichols et al, inclusion of 1-decanol vapor pressures measured near room temperature by Kulikov et al changed the reference vapor pressures in Schultz et al, Keating et al, and Nelson and Chickos by nearly 20% near 298 K (see Figure ); 1-hexadecanol vapor pressures reported by Kulikov et al were however dropped in a subsequent study by Albinsaad et al…”

“…Relative percent error Δ p rel = 100­( p GLC – p 0(Pokorný) )/ p 0(Pokorný) for 1-decanol, where p GLC is vapor pressure calculated by means of eq , ,− and p 0(Pokorný) is vapor pressure recommended by Pokorný et al Experimental vapor pressures reported by N’Guimbi et al (empty circles) and Kulikov et al (empty triangles) are shown for comparison.…”

“…The differences (e.g., more than 5% near T nbp ) can originate not only from different reference standard compounds used but also from the number of parameters in the equation used routinely (and more or less exclusively) by Chickos and co-workers. While Nichols et al, Schultz et al, and Albinsaad et al used all four parameters of eq , Keating et al and Nelson and Chickos set parameter D to zero. Note that the four-parameter Cox equation had to be used by Pokorný et al for 1-alkanols (three parameters were sufficient for n -alkanes).…”

Occurrence of Marine Ingredients in Fragrance: Update on the State of Knowledge

“…It is measured by diverse methods and is expressed as mmHg, and could be calculated by different equation models. A compilation of studies of the vapor pressure of odoriferous compounds has been reported by innumerable studies including terpenes, which are the largest group of natural smell compounds found in essential oils, among others [6][7][8]. The fragrant compounds are detected, via a complex olfaction mechanism, by terrestrial organisms when transported by air from a distance through an airborne signaling process,…”