A calculation for locating the carrier gas front of a gas-liquid chromatogram

Quantitative gas-liquid chromatography of short-chain fatty acids as 2-chloroethanol esters

“…For CEMi-2 the deviations from ideality are small on Apiezon columns, while on EGA columns these deviations are significant, as shown in Figure 3. We consider these deviations from ideality not to be due to the interruption of gas flow which is required in our apparatus (8) while charging loads to the column, since the CEMi-2 peaks are retarded, rather than accelerated, in their elution (8). However, we do not have a satisfactory explanation for the phenomenon shown in Figure 3.…”

“…Bottcher J) for analysis of mixtures of short-chain aliphatic acids. Craig, Tulloch, and Murty (8) state that these several interrelated problems may be resolved by formation of the phenacyl esters of the short-chain fatty acids.…”

Solubility factors for 240 solutes and 207 stationary phases in gas-liquid chromatography

“…ICE = a + a! + 6 + 7r + /3 -1.74 N =175 r = 0.98 k = 0.21 (14) The two tests used clearly show that the predictability is not as good as for retention indexes, but however it remains acceptable and could perhaps be applied for practical purposes. The Exner k test values, for example, are intermediate to those corresponding to the criteria "good agreement" and "utmost admissible limit".…”

“…With relatively short columns, this method appears more precise than the Peterson and Hirsch rule (14) with three paraffins or the use of methane retention times.…”

Inverse gas chromatography study of the thermodynamic behaviour of thermotropic low molar mass and polymeric liquid crystalsElectronic supplementary information (ESI) available: Partial molar enthalpies, excess enthalpies, entropies and excess entropies for hydrocarbon probes in liquid crystals. See http://www.rsc.org/suppdata/cp/b2/b202173k/

“…Each of the values reported is the mean of at least three measurements agreeing within AE1% of the net retention time. To confirm the validity of using methane as the marker, the method of Peterson and Hirsch 29 was used to calculate the retention time due to dead space from retention measurements of three consecutive n-alkanes and values were in close agreement with those for methane retention. The column temperature was monitored to AE0.1 C using a thermocouple that had been calibrated against a Tinsley Type 5840 platinum resistance thermometer.…”