ISSN:
1612-1112
Keywords:
Gas chromatography
;
Macroporous silica
;
Silica-adsorbent modification
;
Low boiling halocarbons
;
Analysis of water pollutants
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary The use of the silica adsorbent Silochrom C-80 modified by a thin liquid stationary phase film is proposed for the gas chromatographic analysis of low molecular weight halocarbons. Such modified adsorbents are characterized by good retention of the volatile halocarbons and high selectivity with respect to halocarbons. The thermodynamic sorption characteristics of alkanes, chloroalkanes and chloromethanes on Silochrom modified by three liquid phases (Apiezon L, methylsilicone and polyethylene glycol 20M) and on Chromaton N with thick films of the same phases were studied. The heats of sorption (−ΔH) and free sorption energy changes (−ΔF) of these substances and the increments −Δ(ΔH) and −Δ(ΔF) per chlorine atom in the chloralkane molecule compared with n-alkanes with the same number of carbon atoms were determined. The “chlorine” retention indices of low molecular weight volatile halocarbons on three sorbents were determined to identify them in aqueous solutions using the electron-capture detector. The analysis of drinking water by this technique is demonstrated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02313679
Permalink
