Archive for 2015

NJDEP-SRP Low Level TO-15 Series: Part 4 – How to calibrate your system Joisey style… with no digression

In the last installment of this series, we talked about optimizing the internal standard (ISTD) responses on the Markes CIA Advantage™. This is a critical step on the road to meeting the NJ LL TO-15 calibration criteria of a 5-point curve from 0.2 to 40 ppbv, for most of the target analytes. I say “most,” because […]

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 […]

NJDEP-SRP Low Level TO-15 Series: Part 3 – How to calibrate your system Joisey style… but first I shall digress on ISTDs

Last time, I showed you how well the Markes CIA Advantage™ and the Rtx®-VMS concentrate and separate the volatile organic compounds (VOCs) of interest for NJ LL TO-15. Next on the agenda would be calibrating our system (i.e., preconcentrator-GC-MS). NJ tells us to calibrate our systems with a minimum of 5 points (more allowed) and […]

Comparison between Different Stationary Phases for the Separation of Phthalates using Gas Chromatography-Mass Spectrometry (GC-MS)

Dan Li, Rebecca Stevens, and Chris English Phthalates are widely used as plasticizers in a variety of industry products. However, some phthalates are considered as endocrine disruptors[1] associated with a number of problems, including birth defects[2], high blood pressure in children[3], pregnancy-induced hypertensive heart diseases[4], respiratory problems[5], and obesity[6]. The European Union (EU) and United States Environmental Protection Agency (US EPA) […]

NJDEP-SRP Low Level TO-15 Series: Part 2 – NJ requires a specific set of 63 VOCs

As discussed in previous blogs, the U.S. Environmental Protection Agency (EPA) Method TO-15 is applicable to a subset of 97 VOCs that are from the list of 189 hazardous air pollutants (HAPs) included in Title III of the Clean Air Act Amendments; however, only a few laboratories are analyzing all 97 components. Most laboratories are […]

NJDEP-SRP Low Level TO-15 Series: Part 1 – Let’s talk about ambient air sampling in the Garden State

Considering I was born and raised in Jersey for 28 years, I think this blog series is right up my alley. With that said the following blog series is going to address how a laboratory may meet all of the New Jersey (NJ) Department of Environmental Protection (DEP) Site Remediation Program (SRP) Low Level (LL) […]

Changing from helium to nitrogen carrier gas in gas chromatography while maintaining separation efficiency and analysis time

In two recent ChromaBLOGraphy posts (see links below) I described the experimental implementation of an idea Jaap de Zeeuw had to use nitrogen carrier gas for GC while maintaining the same separation efficiency and analysis time as what could be achieved by helium carrier gas. Wait, that’s impossible, right?!  Not if you go from a […]

Phthalate Determination by Dual Column Set in Eight Minutes

Dan Li, Rebecca Stevens, Jason Thomas and Chris English If you don’t have a GC-MS for identification of the EPA regulated phthalates, don’t worry! Here we introduce a parallel dual column set for the analysis of regulated phthalates using µECD. As shown in my previous blog , the Rtx-440 column (cat. # 12923) is a […]

Fast gas chromatographic residue analysis in animal feed using split injection and atmospheric pressure chemical ionization tandem mass spectrometry

In a recent ChromaBLOGraphy post I mentioned that we are doing a campaign on “shoot-and-dilute GC”, also known as split injection GC, at RAFA 2015. A paper just published by Tienstra, Portolés, Hernández, and Mol used split injection with APGC for pesticide and other residue analysis in animal feed to achieve many of the benefits we’ve been […]