Archive for 2020

Column and reference standards documentation – one click away

Did you know that many forms of documentation, such as column and standard CofAs, are available one click away  from our homepage? From here, pdfs of safety data sheets (SDSs), certificates of analysis (CofAs) for LC columns and GC guard columns, CofAs and datapacks for reference standards, and more, can be accessed. Our website contains […]

Troubleshooting 101

Like most folks who work in the lab, you likely have had some downtime in the lab due to various reasons, like a column, instrument, sample prep, standards, and even application or method conditions. Troubleshooting then commences. Details are often needed, in order to get the bigger picture. One of the most important troubleshooting tools […]

Want to know how to properly choose a column – please step inside

Often times in technical service there will be a request for a column that can provide a certain separation on a lone pair of analytes.  Take for example, the separation of CO from CH4 from one another. This separation is very easily done on any porous polymer column. What is sometimes not taken into account […]

Tips on the analysis of pesticides and mycotoxins in cannabis products: Matrix matters! (Part III)

This is the final part of the blog series “Tips on the analysis of pesticides and mycotoxins in cannabis products: Matrix matters!” In Part I (here) and II (here), we covered various practical aspects related to matrix effects, spiking procedures, and recoveries. We gave real examples about how matrix type, matrix effects, and spiking strategies […]

Using EZLC to adapt an LC pesticide method for lower pressure

  Our most popular and successful LC column for the broadest range of pesticides is the Raptor ARC-18 column. We are able to retain, provide good separation and peak shape even for many of the more polar pesticides. Whether your matrix is a food, agriculture crop or a cannabis product, the Raptor ARC-18 will probably […]

Solid Phase Extraction: Separation is the Foundation of this Preparation!

In a previous post, we made the case that the foundation for analytical separations is sample preparation.  In this post, we would like to talk about how it works the other way around, too!  Separation can actually be the foundation for sample preparation.   In particular, we would like to talk about how solid phase extraction […]

Modifying QuEChERS for complicated matrices- Soil and Sediment

In previous blog posts for this series on QuEChERS, we discussed QuECHERS dSPE Selection, Modifying QuECHERS..-Dry Samples, Modifying QuEChERS..-High Fat Samples, and Modifying QuEChERS..-High Sugar & Starch. Once again, I suggest using the following documents from the official QuEChERS website (, maintained by CVUA Stuttgart: For Extraction (Stage 1): For dSPE Cleanup (Stage 2): […]

The New U.S. EPA Method TO-15A Blog Series-Part 6: Calibration Curve Fits

Our last several blogs covered the numerous ways to help clean up lab air to meet the new TO-15A guidelines for canister blanks. Absent from the previous blogs was how we were getting quantitative numbers, which is important given the new calibration guidelines in TO-15A. The original TO-15 method only mentioned using an average response […]

Potency: Useful Techniques

The most labor-intensive part of determining the potency of samples containing cannabinoids is extraction. Due to a plethora of matrices, from candy, baked goods, lotions, and so on, selecting the most suitable extraction method can also be a challenge.  The following video and technical article will guide you through that initial process: How Potent is […]

FDA Warns Hand Sanitizers May Contain 1-Propanol

The Food and Drug Administration (FDA) has expanded their recall of hand sanitizers and found more chemical contaminants to include 1-propanol (n-propanol cas# 71-23-8). 2-propanol (isopropanol cas# 67-63-0) and Ethanol (cas# 64-17-5) are the two most widely used active ingredients in hand sanitizers. With this latest addition to the list, the main concern for exposure […]