Archive for the ‘Enviro’ Category

An introduction to the benefits of using split injection when performing semivolatiles analysis by 8270D – the instrument checkout mix

This blog is part of a series; the previous installments can be found here and here. We have mentioned several times that the reduced residence time resulting from the fast sample transfer that occurs during a split injection reduces in-inlet degradation and adsorptive loss. Proof of this can be seen in the first run of […]

International Network of Environmental Forensics Conference in Örebro, Sweden

From the INEF website:  “The International Network of Environmental Forensics (INEF) was founded in 2008 to provide a forum for scientists, environmental consultants, regulators and lawyers to share information regarding the use of environmental forensics.  Environmental forensics is the use of scientific techniques to identify and apportion the source(s), age and timing of a contaminant […]

GC-API-MS for BDEs with N2 at BFR2016

OK Jack, enough of the acronyms; this isn’t a word puzzle… Recently I let ChromaBLOGraphy readers know of our work on using gas chromatography (GC) with atmospheric pressure ionization (API) – mass spectrometry (MS) for analysis of brominated diphenyl ethers (BDEs) employing nitrogen (N2) carrier gas, which was presented at BFR2016 (BFR standing for Brominated […]

Restek at BFR2016 in Toronto – APGC of Brominated Flame Retardants Using Helium and Nitrogen Carrier Gases

In only a few short weeks, I will be giving a presentation on the analysis of brominated flame retardants at BFR2016 in Toronto.  My colleagues and I used an atmospheric pressure ionization mass spectrometer with gas chromatography on an Rtx-1614  (15m x 0.25mm x 0.10µm) column to look at polybrominated diphenyl ethers (PBDEs) in various […]

Don’t Forget to Change Your GC Inlet Bottom Seal and Trim Your GC Column as Part of Your Maintenance Routine!

While doing PAH analysis for dirty samples with splitless GC I saw increased peak tailing and loss of response, so I did what anybody would do: changed my GC inlet liner.  In this case I used a Restek Premium single taper inlet liner with wool.  Unfortunately when I did my next standard analysis, not much was improved.  […]

Fast Analysis of PAHs using Split Injection and a Short GC Column

Click on the this link:  Fast Analysis of PAHs  to see how I analyzed the EPA 16 polycyclic aromatic hydrocarbons (PAHs) in under 10 min using GC-MS by employing split injection with a Restek Premium Precision split liner with wool and a 15m x 0.25mm x 0.25µm Rxi-5Sil MS GC column.  Split injection allows a higher GC oven […]

Shoot-and-Dilute GC – Practical GC – The Column

Check out my recently published articles in LCGC – The Column on Shoot-and-Dilute GC (split injection GC), where I outline the benefits of this technique through recently collected experimental data in my lab at Restek.  I’m two articles into my Practical GC series, with another one soon to be published.  This is a continuation of other split injection work […]

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 […]

A quick evaluation of some disadvantages to performing semivolatiles analysis by EPA Method 8270D with splitless injection

This blog is part of a series; the previous installment can be found here. Semivolatile calibrations on the 30 m x 0.25 mm ID x 0.25 µm df column format often range from 1.0 to over 100 ng/µL; however, a 0.25 mm ID column usually experiences peak overload as the mass on column approaches 10 […]

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) […]