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Back-flushing and heart cut capillary gas chromatography using planar microfluidic Deans' switching for the separation of benzene and alkylbenzenes in industrial samples.

Journal of chromatography. A (2015-11-26)
Matthew R Jacobs, Ronda Gras, Pavel N Nesterenko, Jim Luong, Robert A Shellie
ABSTRACT

Planar microfluidic devices coupled with modern electronic pressure control have allowed gas chromatography (GC) practitioners to easily manipulate chromatographic systems to achieve heart cut and back-flushing configurations. These planar microfluidic devices have enhanced the connectivity between different components of GC instrumentation and have improved the inertness and minimised system dead volumes compared to classical chromatographic unions and valves. In the present contribution the setup and configuration of two multidimensional GC (MDGC) platforms is described for achieving the separation and quantification of trace level target C6-C8 alkylbenzenes in styrene monomer and Isoparaffin™ solvents, using flame ionisation detection (FID). The performance of these MDGC platforms indicated excellent retention time (0.2% relative standard deviation, RSD) and peak area repeatability (1% RSD) for all analytes of interest. The limit of detection (LOD) was 0.8 mg kg(-1) for benzene in styrene monomer, and 2.4-2.8 mg kg(-1) for C6-C8 alkylbenzenes such as benzene, toluene, ethylbenzene and xylene in Isoparaffin™ solvent.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hexane, anhydrous, 95%
Sigma-Aldrich
Benzene, anhydrous, 99.8%
Sigma-Aldrich
p-Xylene, anhydrous, ≥99%
Sigma-Aldrich
Toluene, anhydrous, 99.8%
Sigma-Aldrich
Ethylbenzene, anhydrous, 99.8%
Sigma-Aldrich
o-Xylene, anhydrous, 97%
Sigma-Aldrich
Methanol-12C, 99.95 atom % 12C
Supelco
Styrene solution, certified reference material, 200 μg/mL in methanol
Sigma-Aldrich
Toluene, ACS reagent, ≥99.5%
Supelco
Methanol solution, NMR reference standard, 4% in methanol-d4 (99.8 atom % D), NMR tube size 5 mm × 8 in.
Sigma-Aldrich
Methanol solution, NMR reference standard, 4% in methanol-d4 (99.8 atom % D), NMR tube size 3 mm × 8 in.
Sigma-Aldrich
Ethylbenzene, ReagentPlus®, 99%
Sigma-Aldrich
Benzene, ACS reagent, ≥99.0%
Sigma-Aldrich
Toluene, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.7% (GC)
Sigma-Aldrich
Hexane, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99% (GC)
Sigma-Aldrich
Benzene, puriss. p.a., reag. Ph. Eur., ≥99.7%
Sigma-Aldrich
Toluene, ACS reagent, ≥99.5%
Sigma-Aldrich
p-Xylene, puriss. p.a., ≥99.0% (GC)
Sigma-Aldrich
o-Xylene, puriss. p.a., ≥99.0% (GC)
Sigma-Aldrich
Hexane, ReagentPlus®, ≥99%
Sigma-Aldrich
p-Xylene, ReagentPlus®, 99%
Sigma-Aldrich
Toluene, ACS reagent, ≥99.5%
Sigma-Aldrich
o-Xylene, reagent grade, ≥98.0%
Sigma-Aldrich
Toluene, Laboratory Reagent, ≥99.3%
Sigma-Aldrich
Hexane, Laboratory Reagent, ≥95%
Sigma-Aldrich
Cyclohexane, anhydrous, 99.5%
Sigma-Aldrich
Styrene, ReagentPlus®, contains 4-tert-butylcatechol as stabilizer, ≥99%
Sigma-Aldrich
Rhein, technical grade
Sigma-Aldrich
Methanol, anhydrous, 99.8%
Sigma-Aldrich
Rhein