Development of a new consumable-free thermal modulator for comprehensive two-dimensional gas chromatography

作者：Panic Ognjen; Gorecki Tadeusz^*; McNeish Christopher; Goldstein Allen H; Williams Brent J; Worton David R; Hering Susanne V; Krei**erg Nathan M

来源：Journal of Chromatography A, 2011, 1218(20): 3070-3079.

DOI：10.1016/j.chroma.2011.03.024

• GC x GC instrumentation
• GC x GC modulator
• Cryogen-free thermal modulation
• Field analysis

A simple and cost-effective GC x GC modulator requiring no moving parts or consumables, hence suitable for field analysis and monitoring, was developed. The modulator was constructed from a specially designed Silcosteel (R) trapping capillary, installed outside the GC oven, and coated inside with polydimethylsiloxane (PDMS) stationary phase. Dual-stage modulation was accomplished by resistively heating alternate segments of the trap with a custom-designed capacitive discharge power supply. The performance of the proposed modulator was comparable to many GC x GC systems currently in use, with the injection band widths as low as 60 ms at half height. With proper selection of the stationary phase in the trap, the modulator can be used for the analysis of complex mixtures with volatility range spanning from n-C5 to n-C-40.

• 出版日期2011-5-20