Archive for the ‘Miscellaneous’ Category

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: 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 […]

Choosing an Internal Standard

Adding an internal standard (IS) to an assay can be an excellent way to often improve method precision and accuracy. An IS can account for signal suppression (or enhancement), that may be caused by the sample matrix. When using an IS, the response of your target compound(s) is compared to the response of the IS. […]

Finding Reference Standards Just Got a Lot Easier

The range of reference standards available from Restek is very wide, which is great. But finding a particular formulation among all those options can be a challenge. And, let’s face it, filling out a form to inquire about a custom mix can be a pain in the neck. That’s why we built our new Reference […]

Even More Technical Service “Red Flags” – GC

My third installment of Technical Service Red Flags contain six more situations that cause us to pay attention and ask questions.  I hope you find these helpful. Using a liquid leak detector to locate gas leaks instead of using an electronic leak detector. Or worse yet, using both at the same time.  We have, unfortunately, communicated […]

More Technical Service “Red Flags” – GC

Just like in my original post, Technical Service “Red Flags” – GC, this post contains several additional Red Flags we look (email) and listen (phone) for in technical service. Trying to set the carrier gas flow rate for a packed column without using a flow meter. You may want to review this previous post. Verify your […]

How do I order a dip tube?

  A dip tube (also known as an outage tube) provides vapor space above liquefied gases in a sampling cylinder so that if expansion occurs with an increase in temperature, the pressure is not significantly increased. Basically, the length of the dip tube is used to determine the filling capacity of the cylinder. Outage is expressed as […]