Archive for the ‘Miscellaneous’ Category

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 […]

A Simple Tip for Quicker Searching

One of the questions that Restek’s Technical Service Group is asked frequently is “how do I find ____ on your website?” The Restek website contains tens of thousands of products and supporting resources. In the past, my colleagues have written posts on using our online search function and how to use our searchable chromatogram database. […]

Restek Proudly Supports Young Scientists at Germany’s 28th Annual Separation Science Working Group’s PhD Student Conference

Helping young scientists grow into the chromatographic industry’s next generation of innovators and leaders is an opportunity we relish at Restek. For a company dedicated to the science of separation, it is invigorating to see the work of aspiring chromatographers, and there is no better place to see that than the annual PhD Student Conference […]

How (Not) To Cut Your Capillary Column

There are numerous ways to cut a capillary column. Restek has several tools to accomplish this job. There are sapphire scribes, ceramic scoring wafers, wafers with a handle, and diamond blade column cutters. There are also some tools manufactured by other companies that will cut a capillary column. The choice is typically personal preference. No […]

Extractable Petroleum Hydrocarbon (EPH) – Extractable Background of Resprep EPH Cartridges

Restek’s Resprep EPH Fractionation SPE Cartridges (cat # 25859) provide method-specific performance for EPH analysis of soil and water samples through complete separation of aliphatic and aromatic compounds into distinct fractions, while providing extractable background levels guaranteed to fall under the strict reporting limits of Massachusetts and New Jersey EPH methods.   The cleanliness of […]

Extractable Petroleum Hydrocarbons (EPH) – Lot to Lot Reproducibility of Resprep EPH Cartridges

As previously discussed in my last blog, “Extractable Petroleum Hydrocarbons (EPH) Method – Why it is important?”, Restek’s Resprep EPH Fractionation SPE Cartridges (cat # 25859) provide method-specific performance for EPH analysis of soil and water samples through complete separation of aliphatic and aromatic compounds into distinct fractions, while providing extractable background levels guaranteed to […]

Should I use LC or GC for my analysis?

Although most analysts already know which approach they need to use for analysis, this is occasionally a topic of discussion.  While this blog post is not meant to give an absolute answer for each specific application, I hope to provide some tips to steer you in the general direction towards a solution, if this is […]

Extractable Petroleum Hydrocarbons (EPH) Method – Why it is important?

Spills and releases of petroleum fuels are the largest source of environmental contamination in the United States. Massachusetts published a method that addresses the need to account for semi-volatile aliphatic and aromatic fractions of gasoline using gas chromatography (GC) analysis and a flame ionization detector (FID). This method was designed to measure the collective concentrations […]

LC Columns: High-Pressure Survival of the Fittest!

As an R&D Chemist charged with developing the perfect packing method for new LC columns, one of the challenges is finding a packing method that results in a column which not only passes QC specifications but also passes our arduous lifetime analysis. During lifetime testing our columns are subjected to 1,000 continuous injections at 12,000 […]

Utilizing Restek Reference Standards for Residual Solvent Testing

Restek manufactures several different residual solvent standards.  These can be used for testing according to USP <467>, the EP monograph, or other residual solvent assays, such as medical cannabis testing.   The calculations involved for the use of these standards has led to questions for our technical team.  This post should help provide guidance for their […]