air analytical Articles

  • Operational short-range analytical air pollution modelling

    Operational models that use solutions of the advection-diffusion equation based on more realistic assumptions than that of homogeneous wind and eddy diffusivity coefficients are presented. In particular, these solutions accept that wind and eddy diffusivity profiles are power functions of the height. Moreover, a practical short-range model evaluating ground-level concentrations from elevated ...


    By Inderscience Publishers

  • Analytical Support for Cost-Effective Pollution Control

    ' Analytical tools have been developed by the World Bank Group to estimate rapidly the extent and impacts of pollution in a given situation and to support decisions on pollution management. These tools help decision makers to overcome the frequent lack of data on emissions from different sources, their impact on ambient quality, and mitigation alternatives.' Decision Support System for ...


    By The World Bank

  • A Summary of Available Analytical Methods for the Determination of Siloxanes in Biogas

    ABSTRACT The importance of measuring siloxanes has increased with the recent growth of the landfill-gas-to-energy (LFGTE) market. Siloxanes and other biogas impurities can form a residue upon combustion in engines that may increase maintenance and reduce engine lifetime.  A siloxanes analysis can assist with either determining if a bioaas purification system is needed, or if a system is ...


    By Eurofins Air Toxics Inc

  • Ultra-trace arsenic speciation at Columbia Analytical

    Ultra-trace speciation of arsenic and other metals is performed using a variety of techniques tailored to the specific combination of species, matrix, and detection limits required. Currently, two analytical systems are applied: Ion Chromatography-Inductively Coupled Mass Spectrometry (IC-ICP-MS) and Hydride Generation-Cryogenic Gas Chromatography-Flame Atomic Absorption Spectrometry ...


  • Latest analytical technology ensures biogas efficiency

    Anaerobic Digestion (AD) relies on the ability of specific micro-organisms to convert organic material into a gas that can be used to generate electricity. However, these bacteria require specific conditions if they are to function effectively and instrumentation specialist company HACH LANGE has developed a range of online, portable and laboratory instruments that have enabled a large number of ...


  • Research on the economic consequences of the health effects of air pollution in the UK: its methodological, meta-analytical and innovative aspects

    Epidemiological research has identified that there exists a correlation between days of high air pollution and the timing of death for large numbers of individuals. Before economic values can be attached to these impacts, however, greater information is required on the extent of life lost and the socio-economic characteristics of those at greatest risk. It may be more fruitful to base willingness ...


    By Inderscience Publishers

  • Analytical Solutions for Free-Hydrocarbon Recovery using Skimmer and Dual-Pump Wells

    Accidental release of petroleum hydrocarbons to the subsurface may occur through spills around refineries, leaking pipelines, storage tanks or other sources. If the spill is large, the hydrocarbon liquids may eventually reach a water table and spread laterally in a pancake-like lens. Hydrocarbons that exist as a separate phase are termed light non-aqueous phase liquids (LNAPL). The portion of the ...


    By QED Environmental Systems

  • Comparison between analytical models to simulate pollutant dispersion in the atmosphere

    We present a numerical and statistical comparison between ADMM and GILTT approaches to simulate pollutant dispersion in the Planetary Boundary Layer (PBL). The numerical and statistical comparison of the ADMM and GILTT results confirms the equivalence of these methods. However, the ADMM approach is more efficient under computational point of view regarding the issue of computational time and, ...


    By Inderscience Publishers

  • Analytical model for uni–directional flow passive soil vapour extraction system

    An analytical one–dimensional model has been developed to examine the uni–directional barometric pumping in passive Soil Vapour Extraction (SVE) system. The model is applicable to a special case in which a radial flow field is insignificant. The system considered contains two unsaturated zone layers, an upper contaminated low permeability layer and a lower high permeability layer contains a well ...


    By Inderscience Publishers

  • A demonstration of the necessity and feasibility of using a clumsy decision analytic approach on wicked environmental problems

    Since controversy, conflict, and lawsuits frequently characterize U.S. Environmental Protection Agency's (USEPA) decisions, it is important that USEPA decision makers understand how to evaluate and then make decisions that have simultaneously science‐based, social and political implications. Air quality management is one category of multi‐dimensional decision making at USEPA. The Philadelphia, ...


    By John Wiley & Sons, Ltd.

  • Testing of numerical advection schemes and splitting techniques used in pollution dispersion modelling on an analytic solution

    In the real nature the processes of pollutants advection, their release in and removal from the atmosphere take place simultaneously. In dispersion modelling, these processes are considered separately, one after another within a time step, which causes the generation of some specific errors. Two types of numerical advection schemes, typical Eulerian and semi-Lagrangian one, are considered. The ...


    By Inderscience Publishers

  • Air Monitoring for the Gulf Oil Spill

    Ambient air monitoring is a priority in the ongoing efforts to contain and manage the oil spill from the Deepwater Horizon in the Gulf of Mexico. The following provides information about the kinds of airborne contaminants that are currently being monitored in the Gulf, how they are collected and how they are analyzed. For a given project, a suitable sampling plan – developed by ...


  • Natural ventilation performance of ancient wind catchers, an experimental and analytical study – case studies: one-sided, two-sided and four-sided wind catchers

    An experimental and analytical method has been applied to evaluate air flow pattern in three main kinds of Iranian traditional wind catchers. Results indicate that ARDAKANI wind catcher with one opening is not an efficient device, and airflow average rate in its shaft is negative. It means that one-side wind catcher has a high rate air extract specially in summer and spring which air supply is ...


    By Inderscience Publishers

  • News on Air 2013, Volume 2: Products for Separation

    Supelco® has developed the most extensive line of special purpose columns designed for industry specific applications; including environmental and industrial hygiene. These columns are manufactured to deliver high resolution, great analyte response, low bleed and long column life; allowing analysts to achieve the analytical performance they require. In this issue, you will find easy-to-read ...


    By Sigma-Aldrich Co., LLC

  • Building Services Management - Air Sampling -

    Untitled Document Maintenance professionals are often the first responders to mold complaints in their facilities. building occupants can be exposed to fungal (mold) ...


    By EMSL Analytical, Inc.

  • News on Air 2013: Special Edition for Petrochemical Industry

    This volume features Air Monitoring products that are used the petrochemical industry to ensure worker and community safety.  Supelco's air monitoring products are useful for sampling of indoor (workplace) air and ambient air for a wide variety of analytes, such as aldehydes, volatile organic chemicals (VOC), benzene, toluene, ethyl benzene and xylene (BTEX) and other polyaromatic compounds ...


    By Sigma-Aldrich Co., LLC

  • Comparison of Impinger and Canister Methods for the Determination of Siloxanes in Air

    Abstract Tliis paper compares canister and impinger methods for the analysis of siloxanes in air by gas chromatography/inass spectrometry (GC/MS). Siloxanes are frequently found in commercial and consume? products such as detergents and cosmetics. Most low molecular weight siloxane compounds volatize quickly into the atmosphere; however, some end up in wastewater or landfills when consumer ...


    By Eurofins Air Toxics Inc

  • News on Air 2013, Volume 1: Products for Sampling

    For decades, Sigma-Aldrich has been a key supplier of innovative & high technology air monitoring products for various areas of gas/air sampling. Enclosed, you will find an overview on new and interesting devices to improve or simplify your air sampling. Supelco and Sigma-Aldrich offer a range of active and passive air sampling products, in addition to various analytical chemistry tools ...


    By Sigma-Aldrich Co., LLC

  • News on Air 2013, Volume 4: Labware and Reagents

    Welcome to volume 4 of our News on Air bulletin. This edition focusses on some of the labware and reagents that are used in this challenging area of analysis. Success in air monitoring quantitation requires that all the equipment and reagents used are inherently low in background concentrations, to prevent false positives. Commonly used materials may include: Filters, membranes, and ...


    By Sigma-Aldrich Co., LLC

  • The Application of TO-15 to Naphthalene Measurements in Indoor Air

    Introduction Naphthalene has recently become a compound of concern in many vapor intrusion investigations as a result of its reclassification to a carcinogen by California EPA and its proposed change to a 'likely carcinogen' by the USEPA. Naphthalene is commonly found in petroleum-based fuels and may be present at former manufactured gas plants. To assess the health risk of naphthalene vapor ...


    By Eurofins Air Toxics Inc

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