trace gas monitoring Articles

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Monitoring landfill gas

by Geotech  (Nov. 23, 2011)

Infrared absorption Infrared absorption is usually the preferred method for measuring methane and carbon dioxide. Most gases absorb radiation in the infrared region. The wavelength of radiation that is absorbed is determined by the natural vibration frequencies of the molecule. These natural frequencies will depend on several factors. Thus ...

Nanostructured thin films of Ba doped In2O3 for selectively monitoring trace levels of NOx

by Inderscience Publishers  (Aug. 18, 2010)

Nanostructured thin films of Ba-doped indium oxide have been examined for monitoring ppm levels of NOx in ambient air, and their response patterns have been recorded at different operating conditions. These films are found to be capable of sensing down to 0.5 ppm NOx concentration in air. The optimum operating temperature for sensing is found to ...

Using Headspace Sampling With Capillary Column GC-MS to Analyze Trace Volatile Organics in Water and Wastewater

by American Water Works Association (AWWA)  (Oct. 1, 1988)

Headspace sampling combined with capillary column gas chromatography-mass spectrometry analysis was evaluated for use in the investigation of priority pollutants in water and wastewater. A 3 mL sample loop and cryogenic trapping at minus 80 degrees C were employed to increase the sensitivity into the nanogram-per-liter range. Separations were ...

Chemical Monitoring of Wisconsin´s Groundwater

by American Water Works Association (AWWA)  (Sep. 1, 1986)

In the early 1980´s, a series of limited special purpose investigations was initiated to determine whether certain chemicals were entering Wisconsin´s groundwater and, if so, to determine their concentrations. As a result of concern over the quality of the state´s groundwater and concurrent with the limited special purpose sampling effort, a ...

Permanent Monitoring Systems for Seabed Leakage Detection

by Franatech GmbH  (May 19, 2015)

Seabed leaks Where do they come from? Natural vents: Faults, Pockmarks, and Chimneys Melting hydrates Shallow gas layers Long term leakage along well casings (cracked cement) Injection: fault re-activation/fracturin Lost well control nd failing barriers The mysterious pockmarks at the ...

FTIR resolution requirements for industrial gas analyses

by CIC Photonics, Inc.  (May 1, 2013)

FTIR Spectroscopy FTIR Spectroscopy is a widely used technique for gas analyses in industrial applications. It is a technique used in the semiconductor industry for measuring the purity of cleaning, etching, and epitreatment gases used with various process tools, reactors, and abatement devices. Among chemical companies and R&D faciltities, ...

FTIR resolution requirements for industrial gas analyzers

by CIC Photonics, Inc.  (Aug. 9, 2011)

FTIR Spectroscopy is a widely used technique for gas analyses in industrial applications. It is a technique used in the semiconductor industry for measuring the purity of cleaning, etching, and epi-treatment gases used with various process tools, reactors, and abatement devices. Among chemical companies and R&D facilities, FTIR is applied to ...

Praxair Selects Baseline-MOCON’s New BevAlert Gas Analyzer To Improve Detection Sensitivity Of CO2 Impurities

by Baseline a MOCON company  (May 4, 2007)

Lyons, CO — Praxair, Inc. has upgraded its carbon dioxide (CO2) gas analysis with the installation of multiple BevAlert™ Model 8900 at its plants across North America and select international locations.The BevAlert Model 8900 new gas chromatograph, from Baseline-MOCON, Inc., a subsidiary of MOCON monitors trace impurities in CO2 (and other gases) ...

Teledyne Scientific Instruments - Direct Sampling MS and MS/MS for Real Time Air Monitoring

by Environics, Inc.  (Jun. 28, 2007)

Presented at the 44th ASMS Conference on Mass Spectrometry, May 12-16, 1996 Portland, OR. Published in the Proceedings of the 44th ASMS Conference on Mass Spectrometry May 12-16, 1996 Portland, OR, in press. DIRECT SAMPLING MS AND MS/MS FOR REAL TIME AIR MONITORING C. Remigi, P.T. Palmer, Dept. of Chemistry & Biochemistry, SF State ...

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