Gases Q & A
A number of frequently asked questions about gases and their delivery to a gas chromatography instrument are addressed.
Q&A: Gases
In this month's instament, John Hinshaw addresses a number of frequently asked questions about gases and their delivery to a gas chromatography instrument.
Solid-Phase Microextraction
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.
A GC Troubleshooter's Toolkit
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.
New Gas Chromatography Products for Pittcon 2012
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.
New Gas Chromatography Products 2012
New Gas Chromatography Products at Pittcon 2012
A review of gas chromatography instruments and accessories presented at Pittcon 2012
How to Restore an Idle GC Column to Operating Condition
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.
Headspace Sampling: Instrumentation
The article discusses the fundamentals of instrumentation for headspace sampling, including vial thermostating, pressurization and transfer to the GC inlet.
Headspace Sampling, Part II: Instrumentation
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.
Valves for Gas Chromatography Part III: Fluidic Switching Applications
How to use fluidic switching devices for open-tubular column manipulations, such as heartcutting and comprehensive multidimensional GCxGC.
Valves for Gas Chromatography, Part III: Fluidic Switching Applications
This month the use of fluidic switching devices for open-tubular column manipulations is discussed.
Headspace Sampling
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.
Valves for Gas Chromatography (Part 2): Applications
The 2nd part of this series discusses the use of gas switching valves for column backflushing and 2D series-bypass applications.
Valves for Gas Chromatography, Part II: Applications
Discussion about the use of gas switching valves for column backflush and two-dimensional series-bypass applications
New Gas Chromatography Products at Pittcon 2011
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.
Valves for Gas Chromatography: Fundamentals
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.
Hydrogen Carrier Gas and Vacuum Compensation
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.
When Peaks Collide (Part 2)
Part 2 of the series looks at the effects of peak tailing on resolution and peak overlap.
When Peaks Collide, Part III
John Hinshaw concludes his series on the effects of peak tailing.
When Peaks Collide (Part 3)
The concluding part of the series focuses on testing quantitative area measurment.
When Peaks Collide (Part II)
When Peaks Collide, Part II
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.