John V. Hinshaw

Here, we examine the various way that chromatographers and chromatography data-handling systems locate and measure peaks.

This month's "GC Connections" examines the various ways - and their attendant benefits and drawbacks - that chromatographers and chromatography data-handling systems locate and measure peaks.

How does a GC system set and control gas pressures, flows, and carrier gas velocities electronically?

Have you wondered how your GC system sets and controls gas pressures, flows, and carrier gas velocities electronically? Here, we describe the requirements for and the operation of electronic gas control systems for GC columns and detectors.

Safe and effective gas cylinder setup and use requires the right pressure regulators, fittings, tubing, and filters as well as careful attention to procedure. This month's instalment reviews how to get the best results from laboratory gas cylinders, how pressure regulators work, and what filters should be installed in gas lines.

What you need to know about pressure regulators, gas filtration, and gas fittings - and when to retire your cylinders

A review of GC instruments and accessories that were new at Pittcon or introduced to the marketplace in the preceding year

John Hinshaw presents his annual review of GC instruments and accessories that were newly on display at Pittcon in March 2014, or were introduced to the marketplace in the preceding year.

This instalment discusses the storage and use of carrier and detector gases, gas filtration, and the means by which pressures are controlled on the way from the gas supplies to a GC instrument.

A discussion on the safe storage and use of calibration, carrier, and detector gas cylinders for small or large organizations.

We track the genesis of the top four carrier gases before they start their journey through a GC system.

This month's instalment tracks the progress of helium, hydrogen, and nitrogen carrier gases as they start their journey through a GC system.

Questions about how practical proposed gas chromatography (GC) method changes are often come up during optimization for speed and resolution, or while converting to a different carrier gas. Related objective measurements such as the optimum practical carrier gas velocity were defined more than 40 years ago. This instalment reviews such metrics in the light of their relevance to today's GC challenges.

A discussion of the effects of increased carrier-gas flow in an example separation that includes two pairs of solutes.

John Hinshaw examines the anatomy of chromatographic peaks with attention to features that help determine the suitability of individual chromatographs for a specific analysis task.

The anatomy of chromatographic peaks is examined with attention to features that help determine the suitability of individual chromatographs for a specific analysis task.

In this instalment, John Hinshaw compares the GC separation process to a long-distance run through a long corridor with some unique properties. The runners are separated in various ways.

Long-distance running is examined as a metaphor for gas chromatography separations.

In this instalment, John Hinshaw compares the GC separation process to a long-distance run through a long corridor with some unique properties.

Questions about how practical proposed gas chromatography (GC) method changes are often come up during optimization for speed and resolution, or while converting to a different carrier gas. Related objective measurements such as the optimum practical carrier gas velocity were defined more than 40 years ago. This instalment reviews such metrics in the light of their relevance to today's GC challenges.

John Hinshaw presents his annual review of new developments in the field of gas chromatography introduced at Pittcon 2013.

Gas chromatography instruments and accessories that were newly on display at Pittcon 2013

John Hinshaw presetns his annual review of new developments in the field of gas chromatography introduced at Pittcon 2013.

In this month's instalment, we address common questions about various gases and their delivery to a gas chromatograph.

Comparison of gas flow measurement methods for GC laboratories

Various gas flow measurement methods in the laboratory for GC users are compared.

In part 2 of this series, we complete a list of questions and answers about gases for GC.

More questions about gases and their delivery to a GC instrument

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.

This is an update to a 2003 article with information about new developments in SPME.