GC Analysis of Water in Gasoline (Spiked) on Watercol™ 1910

GC Analysis of Water in Gasoline (Spiked) on Watercol™ 1910

Conditions

column Watercol 1910, 30 m x 0.25 mm I.D., 0.20 µm (29711-U)
oven 45 C (4 min), 5 C/min to 75 C, 10 C/min to 190 C (29711-U)
carrier gas helium, 20 cm/sec (measured in each column at an oven temperature of 135 C)
sample unleaded gasoline, spiked with water at 0.25% (v/v)
injection 1 µL, 50:1 split
liner 4 mm I.D., split/splitless type, wool packed single taper FocusLiner(TM) design
inj. temp. 250 C
detector FID, 250 C; TCD, 200 C

Description

Analysis Note Residual moisture in fuel is very undesirable. This is because it reduces the heat of combustion which increases engine stress, corrodes fuel system components, allows gelling of fuel in cold temperatures through ice crystal formation and nucleation, and accelerates the growth of microbial colonies which can clog fuel systems. The "Watercol" series of ionic liquid capillary GC columns are characterized by their ability to produce a sharp peak shape for water, sharp enough so that water can be integrated and quantified.

This application shows the suitability of Watercol 1910 for the analysis of water in gasoline. In addition to identification of water, the column′s selectivity allowed for the identification of the BTEX analytes. The water and ethanol peaks were confirmed by injecting a series of standards (water in ethanol). The BTEX peaks were confirmed by analysis of neat materials. The unique combination of stationary phase:analyte interactions also allowed the elution of the heavy components (e.g. methylnaphthalenes) in a reasonable time (<19 minutes).
Featured Industry Petroleum
Legal Information Watercol is a trademark of Sigma-Aldrich Co. LLC
Other Notes Two identical columns were installed in separate inlets, each going to a separate detector.
suitability application for GC

Materials

     
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