ENVI-Carb Plus for the Extraction of Propylene Glycol and Ethylene Glycol from Water

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Courtesy of Sigma-Aldrich Co., LLC

ENVI-Carb Plus reversible cartridges were able to extract both propylene and ethylene glycol from water, and the method was demonstrated to be both quantitative and reproducible. Elution was achieved with a combination of organic solvents, offering further options for GC analysis such as sample concentration or solvent exchange. Direct injection of the elution solvent offered an improvement in response and peak shape over direct injection of an aqueous sample.

The extraction protocol shown here appears to be optimized for propylene glycol, as this compound exhibited a significantly better retention on ENVI-Carb Plus than ethylene glycol.

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