John V. Hinshaw | Authors

John V. Hinshaw is the editor of "GC Connections" and has been a columnist with LCGC since 1988. John is one of, if not the premier expert on gas chromatography active in the industry today. He is currently a senior staff engineer with Serveron Corp., Hillsboro, Oregon and a member of LCGC's editorial advisory board.


Safely Delivering the Best Possible Carrier and Detector Gases to Your GC System

The quality of a gas chromatogram depends heavily on the quality of the separation and detection gases, among many other factors. In this month’s instalment, “GC Connections” discusses ways in which chromatographers can ensure a safe working environment while delivering gases that are up to the requirements of the separations at hand, in the context of moving a laboratory to a new location.

A Compendium of GC Detection, Past and Present

Gas chromatography makes use of a wide variety of detection methods. In addition to the most often used flame-ionization detection (FID), electron-capture detection (ECD), thermal conductivity detection (TCD), and mass-selective detection (MSD), the list of other detection methods is long. They really shine when deployed properly, but their properties and applications can be a bewildering alphabet soup. This instalment presents a compendium of gas chromatography (GC) detection methods, both past and vanished as well as those that are current and relevant to today’s separation challenges.

Gas Cylinder Safety, Part I: Hazards and Precautions

Many gas chromatographers are not fully aware of safe practices for handling high-pressure gas cylinders. GC operators should be trained to properly transport, install, connect, and maintain their gas supplies, as well to deal with emergencies. In the first of a two-part series, this month’s GC Connections examines the principal hazards and safety issues surrounding the compressed gas cylinder. Next month’s installment will present safe procedures for routine cylinder use.

Sealing it with Septa

While gas chromatographers may take their septa for granted, in fact these small and seemingly unremarkable polymer discs keep air out of the carrier gas stream when used in an inlet and keep sample intact and uncontaminated when used in a sample vial. Choosing the wrong septa can compromise method accuracy and repeatability as well as reduce column lifetime in extreme cases. This installment addresses septa for inlets and sample vials.