GC Analysis of Water in Gasoline (Spiked) on Watercol™ 1460
CONDITIONS
column
Watercol 1460, 30 m x 0.25 mm I.D., 0.20 μm; two identical columns installed in the same inlet, each going to a separate detector (29695-U)
oven
45 °C (4 min), 5 °C/min to 75 °C, 10 °C/min to 220 °C (10 min)
inj. temp.
250 °C
detector
FID, 250 °C; TCD, 200 °C
carrier gas
helium, 20 cm/sec (measured in each column at an oven temperature of 135 °C)
injection
1 μL, 50:1 split
liner
4 mm I.D., split/splitless type, wool packed single taper FocusLiner™ design
sample
unleaded gasoline, spiked with water at 0.25% (v/v)
Descripción
Nota de análisis
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 1460 for the analysis of water in gasoline. The water peak was confirmed by injecting a series of standards (water in ethanol). In addition to a sharp water peak, the column′s selectivity results in elution of the water peak free from most gasoline components.
Información legal
FocusLiner is a trademark of SGE Analytical Science Pty Ltd.
Watercol is a trademark of Sigma-Aldrich Co. LLC