Archive for the ‘Miscellaneous’ Category

Pesticide analysis for cannabis flower: method and data overview

Pesticides in cannabis has been a hot topic lately and we have been getting many requests for help with this analysis. We did work on pesticide residue testing in cannabis about 6 years ago. At that time, we were limited to testing our methods with a small amount of seized material. Recently, we have been […]

Need Help with QuEChERS: #AskRestek Twitter Q&A session

Just wanted to let everyone know we will be hosting a #AskRestek Twitter Q&A session about QuEChERS next week at 3:00 p.m. EST (12:00 noon PST) on Tuesday, May 3. QuEChERS is a great approach for sample preparation with lots of benefits. It is also very flexible which is nice but that can also make […]

Is it OK to use THF (tetrahydrofuran) on my HPLC?

Well, it might be. In the early days of HPLC, THF was commonly used as a mobile phase solvent. It has eluting strength similar to acetonitrile, but just slightly stronger. Since it technically is an ether and is very miscible with water, it is sometimes useful with reverse phase HPLC. It also provides additional options […]

Analysis of N2O (nitrous oxide) via GC: an update

Nitrous oxide (N2O), is commonly known as “laughing” gas, but is also used as a component in fuels in rockets and as an aerosol propellant. N2O is itself a stable gas and can be analyzed relative easy via gas chromatography. Often it is confused with “nitric oxide”, (NO). NO is a very reactive gas. When […]

Check out Dual Vespel® Ring Inlet Seals

Inlet seals are a critical component for ensuring a leak free seal at the base of a GC inlet.  For those of you who are using standard inlet seals on Agilent or Thermo Trace instruments, Restek also offers an alternative known as the Dual Vespel® Ring seal.  This seal features a Vespel® ring on each side […]

The “Breakdown” of Endrin and DDT for Non-Environmental Chemists

As the title makes clear, this post is aimed more at non-environmental laboratory personnel who are not familiar with US EPA methods.  If you are one of those environmental lab gurus who shudders at the sound of a “pesticide degradation check”, this is probably stuff you already know. Anyways, for the rest of you, you […]

SDS’s for 22010, 22011, 22014 and 22015 (Indicating Oxygen & Moisture traps/filters)

Even though we are not required to include a SDS (MSDS) for most of our products (articles), we often get asked for them for our gas filters/traps (for disposal information). Included below are the SDS’s for the following Restek catalog numbers: 22010 & 22011 (Indicating Oxygen traps/filters) 22010-22011 MSDS Restek       22014 & […]

Calculating pH

I’m guessing that most of us that work in the lab would find it more convenient to measure a pH rather than to calculate a theoretical value.  But, at times, it can be very useful to make that calculation and get an idea of what to expect.  As far as chromatography is concerned, all columns […]

Restek’s First Twitter Lunch & Learn This Thursday, December 17th at 12:00PM EST

Hi there! Restek is excited to be hosting its first Twitter Lunch & Learn this Thursday, December 17th!  It’ll start at 12:00PM EST (UCT-5:00), and you’re invited to join us as we talk GC inlets! You can follow along by visiting: https://twitter.com/hashtag/AskRestek And you can actually join us by simply tweeting your question or comment, adding […]

What is the difference between a Ball, Toggle, and Plug Valve?

Lately we (technical service) have had multiple calls asking the question “What is the difference between a Ball, Toggle, and Plug Valve?”   The first call I took actually caught me off guard because this has not been a common question.  My answer went something like this “For two-handed operation, I prefer the ball valve and […]