The Extraction of Glycols From Water Using ENVI-Carb™ Plus Solid Phase Extraction Cartridges

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The analysis of glycols such as propylene and ethylene glycol from water samples is traditionally done by direct aqueous injection into a gas chromatograph. Aqueous injections are problematic in GC analysis due to issues such as the large expansion volume of water in the inlet, increased carryover, and elevated detection limits. In this work, we have evaluated a unique carbon adsorbent, ENVI-Carb Plus, and found it to be capable of retaining glycols and glycol ethers from water. Subsequent elution of these compounds from ENVI-Carb Plus with an organic solvent allowed for improved GC analysis over direct aqueous injection. The extraction method developed was found to be reproducible and quantitative, and was not affected by the presence of salt and hydrocarbon contamination.

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