Archive for the ‘Miscellaneous’ Category

Electronic Cigarettes Part IX: Vapor Analysis – What does all this mean?

Sorry for the two month blog delay, but by now you know we were utilizing multi-bed thermal desorption (TD) tubes to collect and analyze electronic cigarette vapor (see our last blog here). You also know that we found some interesting volatile organic compounds (VOCs) like formaldehyde, acetaldehyde, acrolein, xylenes, as well as siloxanes in electronic […]

My GC capillary column was not sealed when I received it!

Traditionally, GC capillary column manufacturers have used several different methods to seal their products while in transit and storage. These sealing options include septa, silicone plugs, flame sealing, and press-fit caps.   I’m not going to discuss the advantages and disadvantages of these various approaches in this post. However, what I would like to address […]

The Most Useful Pesticide Standard Ever…monitoring GC inlet “dirtiness”

I have spent most of my time over the past several years testing pesticides and there is one standard that I simply can’t live without…QuEChERS Performance Standards Kit. It is based on a really interesting article* on analyte protectants with a few compounds added. The standard has 40 compounds housed in three vials for long […]

You want them, I got them…a lot of them: pesticides GC-MS/MS transitions

I can tell you that determining transitions (SRMs) for GC-MS/MS can be quite challenging with so many precursor ions to evaluate. I spent a considerable amount of time optimizing transitions for our GC Multiresidue Pesticide Kit which has 203 compounds. That is a lot of transitions to evaluate! I also tested my chromatographic method for […]

Can I use a non-MS column in my mass spectrometer?

Previously, I wrote about using a MS column for non-mass spec applications.  There are occasions when you come across a method or journal article where a non-MS column is used in a mass spectrometer.  People ponder if this is a good idea, and often contact Tech Support for guidance.  So, can I use a non-MS […]

Tube-End Reducers : End Sizes Clarified

I have talked to a few customers this week who were having some trouble identifying the sizes of the ends for our Swagelok® and Parker® Tube-End Reducers, so I thought I would write a post to clarify this information. A general photo of the style of a Tube-End Reducer which we sell is shown below.  The […]

Can I use an MS column for non-mass spec applications?

Many of you may have read my response in the Restek Advantage, where I was questioned about the “MS” designation on some Restek GC columns.  I explained how the MS suffix is for a mass spec grade column.  These MS designated columns are tested and guaranteed for low bleed performance, which is ideal for sensitive […]

Electronic Cigarettes Part VIII: Vapor Analysis – Why we chose multi-sorbent thermal desorption for analyzing VOCs like acetaldehyde

In the last installment of this blog series we let you know that we were utilizing triple-sorbent thermal desorption (TD) tubes to collect electronic cigarette vapor. However, we did not tell you why, but obviously I am going to do so right now. As you may already know, Restek dabbles in the field of whole […]

Need help finding the correct ferrule to install your GC column? Part 5: Shimadzu GCs

You’re ready to install a column into your GC and realize you do not have the correct ferrules. Which ferrule do you choose?  The parameters to consider when choosing the correct ferrule are instrument make and model, nut size and type, ferrule material, and column ID.  A visit to our ferrules home page will provide […]

Need help finding the correct ferrule to install your GC column? Part 4: Thermo Scientific GCs

You’re ready to install a column into your GC and realize you do not have the correct ferrules. Which ferrule do you choose?  The parameters to consider when choosing the correct ferrule are instrument make and model, nut size and type, ferrule material, and column ID.  A visit to our ferrules home page will provide […]