Carbon adsorbents as materials for chromatography I. Gas chromatography

A gas chromatographic method with thermal conductivity detector (TCD) was developed for the determination of water in small amounts (2mg–20 mg) of solid chemicals. Quantification of water is carried out by using ethanol as an internal standard. The method shows good linearity in the range 0.1%–10% water. The precision as repeatability tested with a sample containing 0.5% water has a coefficient of variation of 5.3%. Comparison of the GC test results with another independent method (Karl-Fischer-titration) confirms the accuracy of the new method. Easy handling, independence of the chemical structure of the test substance and the small amount of sample needed are the major advantages of this alternative method of determining the water content of solid chemicals.

Quantitative GC determination of water in small samples

La methode decrite est lineaire entre 2 et 100 ppm. L'eau est dosee dans le butadiene et le persulfurane hexachlore

Determination of trace levels of water in gaseous samples by gas chromatography with helium ionization detection

Modele thermodynamique tenant compte des interactions electrostatiques. Application au melange d'octanesulfonate de sodium et d'octylamine

Coadsorption of mixed anionic and cationic surfactants in reversed-phase liquid chromatography

Publisher Summary Modern gas analysis has developed from the classical to instrumental methods, characterized by measuring physical values, and from macro- to microtechniques, characterized by improved apparatus for measurement. Although this development can be traced from the beginning of this century, the greatest advances in chromatographic principles and instrumentation are accepted as a new basis of gas analysis. This is characterized by a shift from the separation of simple to complex mixtures and to trace analysis. Interest in analyzing permanent and hydrocarbon gases by separation methods is, of course, supported by practical industrial needs. Gas–solid chromatography (GSC) in the elution mode is the most convenient method for this purpose, but frontal and sometimes displacement techniques and gas–liquid chromatography (GLC) have found applications in the solution of some problems (e.g., enrichment procedures, determination of the composition of gases containing higher-boiling vapors or vice versa).

Xin-Jie Wu

Papers

Determination of water at the parts per million level in buta-1,3-diene and associated solvents by gas chromatography