GC Analysis of Water in a 60-Component Solvent Mix on Watercol™ 1910
Materials
related product
CONDITIONS
column
Watercol 1910, 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 (29711-U)
oven
50 °C (1 min), 5 °C/min to 180 °C (5 min)
inj. temp.
250 °C
detector
FID, 250 °C; TCD, 200 °C
carrier gas
helium, 25 cm/sec (measured in each column at an oven temperature of 125 °C)
injection
1 μL, 100:1 split
liner
4 mm I.D., split/splitless type, wool packed single taper FocusLiner™ design
sample
mixture of 60 solvents, each at 0.2% (v/v), and water, at 0.3% (v/v), in pentane
Description
Analysis Note
Moisture in raw and finished goods is undesirable in most industries. It may remain from a manufacturing process, or it may be introduced afterwards during storage.
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. Sharp peak shapes are also produced for many other small polar analytes.
This application shows the suitability of Watercol 1910 for the analysis of water in a 60-component solvent mix (11 alcohols, 1 aldehyde, 7 ketones, 10 esters, 3 ethers, 1 alkane, 12 aromatics, 12 chlorinated hydrocarbons, and 3 nitro compounds). The water peak was confirmed by injecting a standard (water in ethanol). In addition to a sharp water peak, the column′s selectivity results in elution of the water peak free from all 60 solvents.
Legal Information
FocusLiner is a trademark of SGE Analytical Science Pty Ltd.
Watercol is a trademark of Sigma-Aldrich Co. LLC