Title

Analysis of siloxanes in hydrocarbon mixtures using comprehensive two-dimensional gas chromatography

Document Type

Article

Publication Date

9-19-2014

Publication Title

Journal of Chromatography A

Abstract

A comprehensive two-dimensional gas chromatography (GC × GC) method for separating siloxanes from hydrocarbons has been developed using a systematic process. First, the retention indices of a set of siloxanes and a set of hydrocarbons were determined on 6 different stationary phases. The retention indices were then used to model GC × GC separation on 15 different stationary phase pairs. The SPB-Octyl × DB-1 pair was predicted to provide the best separation of the siloxanes from the hydrocarbons. The efficacy of this stationary phase pair was experimentally tested by performing a GC × GC analysis of gasoline spiked with siloxanes and by analyzing biogas obtained from a local wastewater treatment facility. The model predictions agreed well with the experimental results. The SPB-Octyl × DB-1 stationary phase pair constrained the hydrocarbons to a narrow range of secondary retention times and fully isolated the siloxanes from the hydrocarbon band. The resulting GC × GC method allows siloxanes to be resolved from complex mixtures of hydrocarbons without requiring the use of a selective detector.

Volume

1360

Issue

1

First Page

258

Last Page

263

DOI

https://doi.org/10.1016/j.chroma.2014.07.062

ISSN

0021-9673

Comments

ESSN: 1873-3778

Rights

Elsevier

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