US EPA

1580008 

Journal Article 

Determination of Benzene and Toluene in Gasoline by Gas Chromatography Using a Liquid Organic Salt Column 

Poole, SK; Furton, KG; Poole, CF 

1988 

Yes 

Journal of Chromatographic Science
ISSN: 0021-9665 

NIOSH/00177937 

26 

2 

67-73 

English 

https://www.proquest.com/scholarly-journals/determination-benzene-toluene-gasoline-gas/docview/14978402/se-2?accountid=171501
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A chromatographic method for determining benzene (71432) and toluene (108883) in gasoline using a liquid organic salt column was described. Gasoline samples were diluted volumetrically 1:9 with anhydrous hexane. Two microliters of the resulting solution were injected into a gas chromatograph containing a Chromosorb P-AW or W-AW column loaded with 20 to 30 percent tetra-n-ethylammonium-4-toluenesulfonate. A flame ionization detector was used to detect the signals. The column temperature was 120 or 140 degrees-C and the nitrogen carrier gas flow rate was 15 milliliters per minute. When the method was applied to determining the concentrations of benzene and toluene in regular and premium unleaded gasolines, 1.22 percent benzene and 3.10 percent toluene volume/volume (v/v) were found in the regular gasoline and 1.29 percent benzene v/v and 6.78 percent toluene v/v were found in the premium gasoline. No interferences from saturated n-alkanes, ethers, or alcohols containing one to four carbon atoms, except for t-butanol, were noted. The authors note that t-butanol is not a normal constituent of gasoline. If suspected of being present, it can be separated by performing a second analysis at a lower column temperature. Experiments leading to optimization of the procedure were discussed. Variables found to be the most important included column length, carrier gas flow rate, phase loading, support type, and column temperature. 

DCN-165744; Analytical methods; Chromatographic analysis; Aromatic hydrocarbons; Petroleum products; Laboratory techniques; Surface properties; Organic salts