Author Archive

ProEZGC Chromatogram Modeler – there is much more to the program than just the Welcome Screen

When you log into the ProEZGC Chromatogram Modeler software, you will see the screen below, which is what I refer to as the Welcome Screen. This is the starting point for all, and unfortunately all some customers will think there is to the ProEZGC software.   For those of you who have used ProEZGC, you […]

How to select the correct Conversion Kit for your SPME Arrow fiber

Jason Herrington recently wrote a post titled SPME Arrow Configurations.  The last paragraph in this post stated: “One last talking point: We told you there is no free lunch when incorporating the SPME Arrow into your laboratory, because you will have to install a GC Inlet Conversion Kit. It is important to stress that the […]

Purge and Trap weldment installation

Sometimes we get asked by customers for clarification when installing/connecting a new or replacement weldment from their purge & trap autosampler to their Agilent GC’s split/splitless injection port. As a result, I wrote this post to assist those that may be new to this type of installation or those that simply could use a quick […]

Step-by-step instructions to easily, quickly and safely shut-down your GCs

In this current economy with stay-at-home recommendations/requirements due to the coronavirus, it has been unfortunate that many laboratories have been or will be forced to temporarily close their doors until the spread of the virus decreases enough that the stay-at-home orders are rescinded. If you find yourself in this distressing situation, sometimes it is difficult […]

GC compounds – poor peak shapes and missing peaks

One of the most common questions I am asked by customers is “Why is my peak shape so poor?” Another is “I do not see a peak for my compound, what should I do?” Sometimes they are developing a new method and have no experience with the compound(s) of interest; other times things worked well […]

Sampling and analysis of landfill gas / biogas, an overview

Lately it seems that the sampling and analysis of landfill gas / biogas is a popular topic among our customers.  When initially ask about the topic, I had an idea of what customers were trying to do, but didn’t really have a firm grasp on the topic.  As I dug deeper, I began to realize just […]

General (very general) guidelines to help meet GC detection limits.

Sometimes we (tech service) receive requests from customers who cannot meet detection limits when developing a new method or when trying to follow a current method. They ask for advice on how to meet these limits.  As a result, I decided to provide some (very) general guidelines that I would follow back-in-the-day when I would […]

Don’t forget about your lab’s moisture traps/filters, especially when it’s summer

One of the common issues which arise in laboratories during the summer is moisture in the gas lines. Although I never quite understood how this would happen when using gas cylinders, it does, especially when a manifold system is used, or if the length of tubing from the gas source to the instrument is longer […]

Is the column shown on the COA for a chemical reference standard the best column for these compounds?

  In some cases the answer is “yes”. In most cases the answer is “no”.   So why would we choose a column that is not the optimal for a specific standard? It’s because of the large number of reference standards we sell. Each mix needs to have its own validated method. If we were […]

Cross reference lists for GC columns and other useful links

With everyone in such a hurry these days, when you cannot find what you need in a few minutes, how often do you give up and move onto your next project?   I’m the same way, so when I find a way to group commonly referenced information into one convenient area, I usually do it.  Below […]