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…

You’re ready to install a column into your GC and realize you do not have ferrules to do the job. But which ferrule do you choose? The parameters to consider when choosing the correct ferrule are instrument make and model,…

The first time I was asked by a customer about how to convert % by weight of one of our FAME reference standards to µg/mL, I needed to ask for some help. Because we (tech service) occasionally get asked this…

Well, it’s partly a matter of semantics sometimes, but there is usually nothing drastic that you need to do to get your HPLC column going if it is new. There is no baking at high temperatures involved like you…

Molecular Sieve 5A & 13X Columns (packed) Molecular Sieve 5A & 13X (micropacked) Things to Consider Before Ordering a Packed Column . Following the steps below will ensure that your Molecular Sieve packed column is ready to use just several…

When purchasing a GC column the length that you buy isn’t necessarily the exact length that you get. In fact, it is typical that you will receive 0.5 to 1.0 meter more than what you bought! Knowing the exact length…

We’ve all experienced a pressure error on HPLC at some time or another. Here are my best suggestions on handling them. Establish ground rules-This will help to define the problem and distinguish if there really is one. 1. Check your…

ShinCarbon ST Columns (packed & micropacked) Application Note Things to Consider Before Ordering a Packed Column . For those of you who may be interested in using a ShinCarbon for the first time, I’ll walk you through the process…

This is a common question we get asked in tech service, and although this is a better question for the instrument manufacturer, I will try and provide our blog readers some general information. First, let me define my definition of…

Acetonitrile injections don’t damage Rxi-5Sil MS GC columns. But urban legends persist, so analysts sometimes do unnecessary and laborious solvent exchanges for QuEChERS extracts. A real problem that might warrant solvent exchange is mismatch between the polar solvent acetonitrile and…