Archive for 2018

Rxi-624Sil MS Pro-EZGC Library: 591 Compounds to Choose From

Five years ago Chris English showed in his blog post “I Can’t Drive 55” — The Pure Power of EZGC all 233 compounds that were in the Rxi-624Sil library. While that is a lot, we didn’t want to stop there. This weekend we added over 350 new compounds with various functionalities – e.g. alcohols, aldehydes (first time […]

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

Last time, I wrote a blog (here) that showed a better way to configure the EZ No-Vent in the software so that the column length didn’t need to be manipulated. I kept the volumetric flow the same, and showed different ways to minimize the negative chromatographic effects of the reduced linear velocity. Today, I’m going […]

Dilute, Shoot, and Elute – am I missing anything? YES!

  Everyone’s lab is different in terms of how many samples per day are processed, but they all share the common pain point of sample preparation. Some samples like blood and plasma need a significant amount of prep to remove proteins, phospholipids, and salts, whereas labs running urine or drinking water samples can “get by” […]

EXP Fittings: Which Nut Do I Need?

Our brilliant friends at Optimize Technologies are continually innovating and making our lab lives easier. We love their patented EXP Titanium Hybrid Ferrule technology that is truly universal. You can use it on any tubing, any 10-32-port, any instrument—wrench-tight to 20,000 psi. This fully UHPLC-capable EXP ferrule is used with all EXP nuts. Restek offers […]

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 […]

355 compounds have been added to the Rxi-XLB library for the Pro EZGC Chromatogram Modeler

The Rxi-XLB is a popular column for the analysis of PAHs and persistent environmental pollutants (POPs) such as PCBs and Pesticides. We’ve updated the library of 209 PCB congeners, expanded the PAH library to 47 compounds (including 6 deuterated isotopologues commonly used as internal standards or surrogates), and added the 203 compounds in the GC Multiresidue […]

How do I Replace my LC Tubing?

For those that are experienced with LC, you probably have this all figured out.  If that is the case, this might serve as a good introduction to Restek products that you can use for this.  For those that are newbies to liquid chromatography, welcome and I hope you find this useful! The best way to […]

Optimizing Mass on Column to Balance Sensitivity Requirements and Calibration Range with Split Injection

This is a continuation of the EPA Method 8270 blog series started in January of 2016. Previous posts: 1, 2, 3, 4, and 5. We’ve been focusing on the advantages of split injection analysis, while highlighting the weaknesses of splitless injection. This blog is going to revisit the topic of column overload in more detail […]

Cannabis Concentrates Part II: We’re Heading to Space!

Welcome back! It’s been a little while since my last blog, but in that time, we’ve been doing some interesting things regarding cannabis research. Last time, I discussed that we would be analyzing residual solvents in cannabis concentrates and today, I’m going to show one of the methods that we’ve been working on. If you […]

Alicat Flow Meters for Your TO-11/13/15/17 (Anything Air) Laboratory: Let’s Talk About Errors and Ranges

If you already own an Alicat flow meter, then I will soon be preaching to the choir. However, if you do not have an Alicat flow meter and you work in a toxics organics (TO) air laboratory, whether it be U.S. EPA Method TO-11A or TO-17, etc… then you do not know what you are […]