ISSN:
0935-6304
Keywords:
Gas chromatography, GC
;
Fused silica capillary column
;
Non-methane hydrocarbons, NMHCs
;
Magnesium perchlorate
;
Air analysis
;
Cryogenic preconcentration
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
A comparison has been made between two cryogenic preconcentration - high resolution gas chromatography techniques for the analysis of non-methane hydrocarbons in ambient air, one involving treatment of air samples with magnesium perchlorate to remove water, the other involving analysis without treatment. Recoveries of C1-, C2-, and C3-substituted benzenes in treated samples were 80%, 50%, and 50%, respectively. Incomplete recovery of C7-C9 n-1-olefins was also observed. C2-C8 hydrocarbons and C2-C6 n-1-olefins were recovered with greater than 90% efficiency. Analyses of certified audit samples containing a mixture of C2-C8 aliphatic and aromatic hydrocarbons at the 20 ppbv level in humidified zero-grade air indicated that the accuracy of the technique for untreated air samples was approximately 90%. The use of magnesium perchlorate for water removal cannot be recommended for the analysis of non-methane hydrocarbons in ambient air.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jhrc.1240141105
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