How to Choose a GC Inlet Liner: Simplify Selection Based on Injection Type

Author(s): Scott Adams
Restek Corporation

Published By: Restek Corporation

Year of Publication: 2014

Link: http://www.restek.com/Technical-Resources/Technical-Library/General-Interest/gen_GNAR1991B-UNV

Abstract: How do you choose the GC inlet liner that’s best for your application? With so many options available, selecting the right liner can be a daunting task. In this technical article, Restek makes it easy to choose the best GC inlet liner for each injection technique. Read on and learn how to simplify liner selection!

Restek Signs On With the Aegis Sciences Foundation to Benefit Veterans Charity

N2N 2014 Restek Corporation is pleased to have been a sponsor of the 2014 N2N bike tour. Now in its second year, the N2N (short for Natchez to Nashville) ride covers a blistering 444 miles—from southern Mississippi to Middle Tennessee—in just 4 days along the historic Natchez Trace Parkway. In addition to corporate sponsorships like Restek’s, each of the 22 participating cyclists committed to raising at least $2,220 for charitable distribution through the Aegis Sciences Foundation.

The Aegis Sciences Foundation was established in 2013 by valued Restek partner Aegis Sciences Corporation, a forensic toxicology and health care sciences laboratory in Nashville. The foundation is dedicated to supporting local communities with a particular focus on youth education, military veterans, and healthy living.

Proceeds from this year’s N2N—which exceeded $80,000!—went to raise awareness and funds for Team Red, White, and Blue, who along with the UnitedHealthcare Pro Cycling Team also joined the cyclists for portions of the ride. The national non-profit Team RWB has a mission to enrich the lives of America’s veterans and connect them to their communities through physical and social activities. The N2N tour was a perfect fit for this great organization, and Restek is proud to be a part of this event with Aegis Sciences.

For more information about the N2N, visit www.biken2n.com

Photo courtesy of Kelsey Morris, Aegis Sciences Corporation

Photo courtesy of Kelsey Morris, Aegis Sciences Corporation

 

Combined Determination of 1,4-Dioxane and Nitrosamine Contaminants in Drinking Water Using a Single SPE Cartridge and Concurrent Solvent Recondensation–Large Volume Splitless Injection (CSR-LVSI) With EI GC-MS

Author(s): Chris Rattray and Jack Cochran
Restek Corporation

Published By: Restek Corporation

Year of Publication: 2014

Link: http://www.restek.com/Technical-Resources/Technical-Library/Environmental/env_EVAN1922-UNV

Abstract: Global concern over the carcinogenic potential of 1,4-dioxane and several nitrosamines has resulted in increased interest in the development of more efficient testing methods for these contaminants in drinking waters. In the U.S., the current methodologies recommended for the analysis of 1,4-dioxane and nitrosamines in drinking waters are Environmental Protection Agency (EPA) Methods 522 and 521, respectively. EPA Method 522 is a relatively simple gas chromatography–mass spectrometry (GC-MS) method using electron ionization (EI), while Method 521 requires positive chemical ionization (PCI) using liquid methanol or acetonitrile reagent gas, along with tandem mass spectrometry (GC-MS/MS).

The method described here uses the same coconut charcoal sorbent solid phase extraction (SPE) cartridges and dichloromethane eluent recommended in EPA Methods 522 and 521 to concentrate 0.50 L water samples to 10 mL extracts. However, both the extraction and instrumental analysis portions of EPA Methods 522 and 521 have been combined by analyzing a single quantitatively collected SPE tube extract for both 1,4-dioxane and nitrosamines during a single chromatographic run. The benefits of the current combination method include fewer samples to collect, ship, and extract; a reduction in solvent use; and higher sample throughput. Because the final SPE extract cannot be concentrated via evaporation due to volatile compound loss, we employed concurrent solvent recondensation–large volume splitless injection (CSR-LVSI), which uses a standard splitless injector to deliver 50 µL injections of extract to a pre-column connected to a typical GC column for separation followed by EI MS analysis. When combined with selected ion monitoring (SIM), this large volume injection allows for practical quantitation limits (PQLs) as low as 10 ng/L for 1,4-dioxane and 0.5–2.0 ng/L for the nitrosamines.