John V. Hinshaw

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

In this month's instament, John Hinshaw addresses a number of frequently asked questions about gases and their delivery to a gas chromatography instrument.

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

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.

This month's instalment presents the latest tools and accessories for the gas chromatographer. Have you got what you need in your troubleshooting toolkit?

Many tools gas chromatographers keep on hand are specialized, but others can be found in the toolkits of plumbers and carpenters.

In this instalment John V. Hinshaw reviews gas chromatography instruments and accessories that were newly presented at Pittcon 2012 or were introduced to the marketplace in the preceding year.

In this instalment John V. Hinshaw reviews gas chromatography instruments and accessories that were newly presented at Pittcon 2012 or were introduced to the marketplace in the preceding year.

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

Here is what to do to bring an idle capillary GC inlet column and detector back to operating condition – including column installation, electronic pneumatic control calibration, system bakeout and basic test mix performance.

Here is what to do to bring an idle capillary GC inlet column and detector back to operating condition – including column installation, electronic pneumatic control calibration, system bakeout and basic test mix performance.

The article discusses the fundamentals of instrumentation for headspace sampling, including vial thermostating, pressurization and transfer to the GC inlet.

The second part of the series covering the fundamentals of instrumentation for headspace sampling discusses vial thermostating, pressurization and transfer to the gas chromatograph's inlet.

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

This month the use of fluidic switching devices for open-tubular column manipulations is discussed.

Addresses some of the details of static HSGC theory and practice for conventional liquid-phase headspace samples to better understand and control the analytical processes.

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.

The 2nd part of this series discusses the use of gas switching valves for column backflushing and 2D series-bypass applications.

Discussion about the use of gas switching valves for column backflush and two-dimensional series-bypass applications

This was a strong year for GC systems. Here's what is new.

John Hinshaw reviews the new GC instruments and accessories that were on display at Pittcon 2011.

A new series on valves and the pivotal role they play in gas chromatography.

The first installment in this series on valves presents basic concepts, applications, and implementations.

A look at the effect of choosing hydrogen carrier gas on column selection and when using direct-interface GC–MS

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.

John Hinshaw concludes his series on the effects of peak tailing.

The concluding part of the series focuses on testing quantitative area measurment.

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

In Part II of this series, John Hinshaw covers the effect on tailing peak measurements when the peaks start to merge, following on from Part I, which discussed nontailing peaks.