Archive for the ‘Method Translator and Flow Calculator’ Category

Restek’s EZGC Online Suite that includes the Method Translator and Flow Calculator, and a Chromatogram Modeler, wins a TASIA Award – Chris Nelson, One of the Suite Builders

The Analytical Scientist is a very smartly produced scientific magazine full of interesting articles, including many on chromatography.  I’ve had the pleasure of working with two of the minds behind this publication, Rich Whitworth and Frank van Geel, on a TAS GCxGC contribution, and have been impressed with the volume of quality work they’ve put […]

Peak Capacity in Capillary GC

Peak Capacity in capillary gas chromatography is different than sample loading capacity, which is something I’ve posted on multiple times recently in ChromaBLOGraphy.  Peak capacity is simply the number of theoretical peaks that can “fit” inside a chromatogram under some definition of how much they should be separated (e.g. baseline resolved or some other criterion).  […]

Alternate GC Carrier Gas: Helium to Nitrogen, 30m x 0.25mm x 0.25µm Column to 20m x 0.15mm x 0.15µm Column

I sent my earlier post, “Switching from Helium to Nitrogen Carrier Gas for GC by Switching from a 30m x 0.25mm x 0.25µm Column to a 20m x 0.15mm x 0.15µm Column” to Roy Lautamo at Restek West for review, as he has a critical eye for particulars.  He wanted to see finer detail in […]

Switching from Helium to Nitrogen Carrier Gas for GC by Switching from a 30m x 0.25mm x 0.25µm Column to a 20m x 0.15mm x 0.15µm Column

Our own Jaap de Zeeuw is a master chromatographer and he sometimes does his best work while sleeping.  Recently he was sharing with me an idea that woke him up in Singapore at 3 AM about switching from helium carrier gas for GC, which is still under threat from a supply shortage, to nitrogen, an […]

Does a different oven temperature programming rate change overload for PAHs on a GC column?

Jaap proposed that it might make a difference, so I wanted to test that possibility and add it to the following series on sample loading capacity, or “loadability” as Jaap calls it, for gas chromatography. Sample loading capacity for PAHs on a 30m x 0.25mm x 0.25µm Rxi-5ms GC column Does a thicker film GC column increase […]

Finally, some increased sample loading capacity for PAHs! Part 4: 30m x 0.32mm x 0.50µm Rxi-5ms

This may be the last post in my series on sample loading capacity for PAHs on Rxi-5ms GC columns. Sample loading capacity for PAHs on a 30m x 0.25mm x 0.25µm Rxi-5ms GC column Does a thicker film GC column increase sample loading capacity for PAHs? 30m x 0.25mm x 0.50µm Rxi-5ms Sample loading capacity […]

Sample loading capacity for PAHs, part 3: 30m x 0.32mm x 0.25µm Rxi-5ms

My last post, “Does a thicker film GC column increase sample loading capacity for PAHs? 30m x 0.25mm x 0.50µm Rxi-5ms”, generated some interesting internal discussions between me, Jaap de Zeeuw, Chris English, and Chris Rattray, as to what constitutes overload of a GC column.  Jaap really focused on peak shape and contested my assessment […]

Does a thicker film GC column increase sample loading capacity for PAHs? 30m x 0.25mm x 0.50µm Rxi-5ms

After my post, “Sample loading capacity for PAHs on a 30m x 0.25mm x 0.25µm Rxi-5ms GC column”, a ChromaBLOGraphy reader posed the question about how a 0.50µm column would work.  It’s a great question, because column vendors routinely advertise that thicker films have more sample loading capacity.  But do they really, and if so, […]

Chemstation 101: Quickly Update Your Retention Time Windows Using the Run Times Provided by the EZGC Method Translator

Jason, Jack and Michelle have all recently posted on using the EZGC Method Translator. Whether you are changing carrier gasses or performing column trimming maintenance (while maintaining the same elution profile), you can quickly adjust all your compound retention times using the Global Update feature built into MSD ChemStation. The following screenshots show where to […]

Electronic Cigarettes Part III: We’re gonna vape on the EZGC bandwagon.

The title says it all… we’re taking our e-cig method and jumping on the EZGC Method Translator and Flow Calculator bandwagon. Why… well because all the cool kids are doing it. No seriously… to simply reiterate how easy it is to use the Method Translator. In fact, the EZGC Method Translator makes life so easy […]