Archive for the ‘Optimizing Applications’ Category

Are you experiencing helium supply issues and rising costs?

Helium supply issues are nothing new.  At Restek we have been discussing this off and on for years now.  The following articles and information are just a small selection of what is available on our website and our ChromaBLOGraphy, and are there to help you make informed decisions about alternatives to helium, and reduced helium […]

Trans fatty acids analysis part 2: Let’s look at actual samples with incurred TFAs

In my previous blog, I’ve tried and failed to acquire a sample that contained any trans fatty acids (TFAs). While this is a great news for everyone’s health, the scientist in me was somewhat disappointed. That’s why I first decided to cheat a little bit and look at different TFAs – ruminant TFAs. Ruminant TFAs […]

A better way to configure your EZ No-Vent GC-MS Connector

If you are using the EZ No-Vent for Agilent mass spectrometers (cat.# 21323), you are probably tricking your instrument into working properly by inflating the length of your column in your acquisition software. If you have MassHunter, or a recent version of MSD ChemStation  (G1701EA), you don’t have to do this. Instead of configuring your […]

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 […]

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 […]

New Custom UCMR4 Standard for EPA Method 530 on the Rxi-5Sil MS

We recently stocked custom EPA Method 530 standards made specifically for labs participating in Unregulated Contaminant Monitoring Rule 4 (UCMR4). Quantitative Certificates of Analysis with Data Packs are available for each item. Email csreps@restek.com or phone 800-356-1688 ext. 3 to place your order (items are not available at Restek.com). EPA Method 530, the Determination of Select Semivolatile […]

EPA Method 541 on the Stabilwax Column

I recently posted some chromatograms for our new EPA Method 541 UCMR4 Standards, and wanted to focus on the column in a separate post. EPA Method 541 was developed on a 30m x 0.25 mm ID x 0.50 µm wax column from another manufacturer. I used the Stabilwax because it is a relatively low bleed […]

New Custom UCMR4 Standards for EPA Method 541

We recently stocked custom EPA Method 541 standards made specifically for labs participating in Unregulated Contaminant Monitoring Rule 4 (UCMR4). Quantitative Certificates of Analysis with Data Packs are available for each item. Email csreps@restek.com or phone 800-356-1688 ext. 3 to place your order (items are not available at Restek.com).   Cat# 572263 – Method 541 UCMR4 Standard […]

New Custom UCMR4 Standard for EPA Method 530 on the Rtx-1701

We recently stocked custom EPA Method 530 standards made specifically for labs participating in Unregulated Contaminant Monitoring Rule 4 (UCMR4). Quantitative Certificates of Analysis with Data Packs are available for each item. Email csreps@restek.com or phone 800-356-1688 ext. 3 to place your order (items are not available at Restek.com). Cat# 572262 – Method 530 UCMR4 Standard (in […]

New Custom UCMR4 Standard for EPA Method 525.3

We recently stocked a custom EPA Method 525.3 standard made specifically for labs participating in Unregulated Contaminant Monitoring Rule 4 (UCMR4). Quantitative Certificates of Analysis with Data Packs are available for each item. Email csreps@restek.com or phone 800-356-1688 ext. 3 to place your order (items are not available at Restek.com) Cat# 572261 – Method 525.3 UCMR4 […]