Capillary GC Columns for Analysis of BTEX Hydrocarbons

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Courtesy of Sigma-Aldrich Co., LLC

A number of different stationary phases have been used for analyzing benzene, toluene, ethylbenzene, and xylene hydrocarbons (the BTEX) compounds). Capillary columns based on a nonpolar shape-selective phase, a chiral stationary phase, and a polyalkylene glycol phase, and support coated open tubular columns (SCOT), exhibit differing abilities to resolve these compounds. A Bentone 34/di-n-decylphthalate fused silica SCOT column provides the best resolution, and is a possible alternative to the traditional bonded polyethylene glycol phase, such as SUPELCOWAX 10.

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