John Hinshaw

John Hinshaw offers his insights into how the current helium shortage will affect gas chromatographers and answers some concerns of The Column readers selected from the CHROMacademy Forum.

A number of frequently asked questions about gases and their delivery to a gas chromatography instrument are addressed.

SPME decouples sampling from matrix effects that would distort the apparent sample composition or disturb the chromatographic separation. It is also easy to use and reduces solvent consumption.

In this month's installment, John Hinshaw discuses solid-phase micro extraction.

A review of gas chromatography instruments and accessories presented at Pittcon 2012

How to use fluidic switching devices for open-tubular column manipulations, such as heartcutting and comprehensive multidimensional GCxGC.

A clear understanding of the chemical system of the sample in headspace — and how temperature and peak volume affect peak areas, sensitivities, and repeatability — will improve headspace analysis.

John Hinshaw investigates the influence that choosing hydrogen carrier has on column selection and operation with direct-interface GC?MS.

Part 2 of the series looks at the effects of peak tailing on resolution and peak overlap.