Gas Sampling Articles

  • Analyzing gas using transmission spectroscopy | Spectroscopy Guides

    How can transmission spectroscopy analyze a gas sample? Like many other samples, a gas (or vapour) can be analyzed using the transmission of an infrared beam through the sample, reading the strength of the various wavenumbers upon exiting the sample and arriving at a detector. ...


    By Specac Limited

  • Overcoming Natural Gas Sampling Challenges in Oil & Gas Applications

    It is a fact that in order to comply with various government rules and regulations, oil and gas companies have to continually take natural gas samples to prove the gas composition and amount of gas flowing in their oil fields. The challenge comes in trying to actually take an adequate gas sample representative of the gas flow. First, engineers must carefully consider where the ...


    By Sierra Instruments, Inc.

  • Heat treatment of steels and other metals case study

    Application Moisture is measured in the blanketing gases that are used in the treatment of steel. Problem Inert blanketing gases are required during the heat treatment of steels to prevent oxidation of the metal product. At heat-treating temperatures, moisture and oxygen will readily react with the metal to form an undesirable metal-oxide coating on the ...

  • Evaluating Leaks in a Soil Gas Sampling Train

    ABSTRACT The current advisory for active soil gas investigations in California requires leak tests to be conducted at eveiy soil gas probe while taking a sample. A leak may allow ambient ak into the sample train thus diluting the soil gas and underestimating the results. Also, the leak check compound itself may have impurities thereby contaminating the sample. The advisoiy suggests leak ...


    By Eurofins Air Toxics Inc

  • Analytik Jena AG: State of the Art - Fully Automated and Matrix-Optimized Gas Analysis with multi EA 5000

    The analysis of gaseous matrices is still a real challenge. No matrix type is as versatile in its behavior and the requirements for sample feed and combustion process. This makes it difficult to gain quick, precise, and reliable results. Thanks to the outstanding flexibility of the application-optimized gas sampling systems, the elemental analyzer multi EA 5000 can analyze liquefied gases (LPG), ...


    By Analytik Jena AG

  • CFD modelling of sampling locations for early detection of spontaneous combustion in long–wall gob areas

    In this study, computational fluid dynamics (CFD) modelling was conducted to optimise gas sampling locations for the early detection of spontaneous heating in longwall gob areas. Initial simulations were carried out to predict carbon monoxide (CO) concentrations at various regulators in the gob using a bleeder ventilation system. Measured CO concentration values at these regulators were then used ...


    By Inderscience Publishers

  • Sampling VOCs with Supel™-Inert Film Gas Sampling Bags

    Sampling VOCs with Supel™-Inert Film Gas Sampling Bags with Thermogreen™ LB-2 Septa as an Alternative to Tedlar® For 10 years, Supelco has provided our customers with high quality Tedlar gas sampling bags. Recently, we expanded our gas sampling bag line to include an alternative to Tedlar for sampling VOCs that incorporates our low-bleed Thermogreen™ LB-2 ...


    By MilliporeSigma

  • Dry cleaner investigation

    A BEACON Passive Soil-Gas (PSG) Survey was performed at a dry cleaner site in the southeastern United States to determine if Tetrachloroethene (PCE) contamination identified beneath the dry cleaner in a prior BEACON PSG Survey was migrating off site and, if so, in which direction it was moving. This survey involved 30 field samples collected in a grid pattern. Analytical results were provided to ...

  • Triad expedites brownfields redevelopment in Fairbanks

    The Fairbanks North Star Borough (FNSB) used Triad in 2006-2007 to assess environmental conditions at a municipal property along the Chena River in Fairbanks, AK. FNSB accelerated the site investigation as part of a brownfields assessment grant received from the U.S. EPA in 2005. Low-level contamination had been identified onsite in past investigations, but its extent and impact on future ...

  • Factors contributing to fatalities in General Aviation accidents

    According to National Transportation Safety Board (NTSB), General Aviation (GA) is accountable for 82% of total air transport related accidents and incidents and for 83% of all air transport related fatalities. By applying logistic regression on a large sample of GA accidents from 1983 to 2002 we identify factors that increase the chance of a fatal GA accident. In this study a wide range of ...


    By Inderscience Publishers

  • Warren County Case History

    A non-hazardous solid waste landfill in northwestern New Jersey successfully used construction and demolition (C&D) debris screenings as an alternative daily landfill cover for six years, until landfill gas sampling indicated excessively high H2S volumes. While the U.S. Environmental Protection Agency estimates an average of 35.5 parts per million by volume (ppmv) of H2S in landfill gas, the ...


    By Merichem Company

  • Impact of Sampling Media on Soil Gas Measurements

    Abstract To evaluate the vapor intrusion pathway for a building and to assess the associated human health risks, soil gas samples near the building site and under the building foundation may be collected. In order to meet risk assessment goals, the analytical laboratory is often required to report compounds of concern for these soil gas samples down to the part per billion ranges or lower. ...


    By Eurofins Air Toxics Inc

  • Sampling errors in the study of acid gases and anion species in atmospheric aerosols

    Atmospheric acid aerosols were sampled by two annular denuder systems (ADS) and a micro-orifice uniform deposit impactor (MOUDI) at a traffic site in central Taiwan. Theoretical analysis showed that the relative artifact for HNO3 gas sampling was about 0.53 when the initial HNO3 concentration was under 0.2 µg/m³ and should be considered carefully. The ...


    By Inderscience Publishers

  • Properties and Behavior of Fuels

    Fuel contaminants are generally nonhalogenated. Information presented for nonhalogenated VOCs and nonhalogenated SVOCs may also be appropriate for many of the fuel contaminants presented in this subsection. Contamination by fuel contaminants in the unsaturated zone exists in four phases: vapor in the pore spaces; sorbed to subsurface solids; dissolved in water; or as NAPL. The nature and extent ...

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