Molecular sieves as subtractors in gas chromatographic analysis

Gas Chromatographic Techniques for the Identification of Low Concentrations of Atmospheric Pollutants

“…The use of Molecular Sieve Type 5-A in a subtractive role has been described by Brenner et al (7). In the present study it was found that, at low concentrations, compounds which he reported as not being adsorbed were adsorbed.…”

Gas Chromatography

“…was successfully used by Eggertsen and Groennings (112) for the separation of normal from nonnormal hydrocarbons. Brenner et al (45) had extended their subtraction studies to include 4A, 5A, and 13X Molecular Sieves. High molecular weight hydrocarbons (n-Cis to C23) were separated at temperatures around 250°C.…”

“…An enrichment trap for use w7ith capillary columns also was described (404) Precolumns wrhich selectively retain either the matrix or the desired materials are often useful. Brenner et al (45,124) referred to this technique as subtraction and investigated the selectivity of Molecular Sieves for this purpose. Certain effects altering the apparent selectivity w:ere attributed to chemical reaction on the basic Molecular Sieves (124).…”

Identification of Hydrocarbon Peaks in Gas Chromatography by Sequential Application of Class Reactions

“…About 3 volume % in helium 1. Does not include cis-trans isomerization, which in some cases may be considerable.VOL 33, NO.…”