Air Monitoring Articles

  • Risk Criteria - When is low enough good enough?

    Criteria are used to help decide whether the risk associated with a project or activity is low enough to proceed. The key question then, is when is low enough good enough? This paper describes the flexible framework in use in the oil, gas and petrochemical industries for deciding on the tolerability of risk. The levels of individual risk that are generally accepted world-wide as intolerable are ...


    By Risktec Solutions

  • New laser-based dust emission monitoring system

    Abstract A new generation of continuous particulate matter concentration monitoring instruments is presented, covering a measuring range of 0 to 1000 mg/m3. The laser-based scattered light instrument gives an improved stability as well as excellent resolution in the low range. This enables high concentration measurement as well as especially low emission monitoring down to 0.01 mg/m3 with a ...


    By SIGRIST - PHOTOMETER AG

  • Life expansion in Sørkapp Land, Spitsbergen, under the current climate warming

    Terrestrial life response to climate warming in Sørkapp Land after the Little Ice Age is described. Plant succession starts in the areas abandoned by glaciers and continues in the areas which have been outside glaciers. Continuoustundra becomes denser in many places of the west and south. A denser tundra attracts animal species feeding on plants. Vegetation of non-glaciated areas in the ...


    By Springer

  • Early-20th Century Environmental Changes Inferred Using Subfossil Diatoms from a Small Pond on Melville Island, N.W.T., Canadian High Arctic

    Diatom-based paleolimnological studies are being increasingly used to track long-term environmental change in arctic regions. Little is known, however, about the direction and nature of such environmental changes in the western Canadian high Arctic. In this study, shifts in diatom assemblages preserved in a 210Pb-dated sediment core collected from a small pond on Melville Island, N.W.T., were ...


    By Springer

  • Mercury in Northeastern North America: A synthesis of Existing Databases

    A large number of datasets representing mercury (Hg) levels in northeastern North America were assembled in a standardized format between 2000 and 2003. Based on support from the Northeastern States Research Cooperative, scientists annually gathered and developed an operational template to collaboratively analyze and interpret these data for a series of peer-reviewed publications. The diverse ...


    By Springer

  • Analysis of PCBs in emission samples: non ortho, mono-ortho and homolog totals by level of chlorination

    Polychlorinated biphenyls (PCBs) are one of the most widespread persistent organic pollutants, identified in every component of the global ecosystem. A production of approximately 2 * 10 9 Kg technical PCB occurred form 1930 to the late 1970 1 and the total amount released into the environment is estimated in 370. 000 2 tonnes. Twelve of the possible 209 PCBs are non- and mono-ortho substituted ...


    By Monitoring Systems GmbH

  • Designing and Implementing Perimeter Air Monitoring Programs

    Perimeter or fenceline ambient air quality and meteorological monitoring programs have become increasingly valuable at hazardous waste, landfill, dredging, ports, and MGP remediation sites. Air quality monitoring programs protect public health and reduce owner liability ...


    By AECOM

  • Laser gas detection is now cheap, fast and reliable

    Laser based gas detectors are now being used in a wide variety of applications for process and quality monitoring, and safety and environmental compliance. The reasons are that laser detectors are more reliable and less expensive than alternative solutions. Laser detectors combine semiconductor tunable diode lasers (TDL) and optical fibres developed by the telecommunications industry with ...


    By Boreal Laser Inc.

  • Fluoride Emission from Anode Butts in a Cooling Tunnel

    Abstract Nordic Aluminium has been trying out a cooling tunnel for hot anode butts in order to lower the fluoride content of the working environment. The cooling tunnel is connected to the Fume Treatment Plant so that it has forced suction from it. The purpose of this study is to evaluate the effectiveness of the tunnel in removing HF emissions and make suggestions on how to make the tunnel ...


    By Boreal Laser Inc.

  • Why large size adds to value: a comment on Dennis Mueller's paper

    Dennis Mueller's paper raises a puzzle. Economies of scale and market power do not explain the very large size of firms in the oil and gas industry. At the same time, managers of large cash-rich firms are tempted to invest in substandard projects and firms, e.g. via mergers. This should spell doom for very large firms. But, in reality, large firms seem to have value. In this comment, it is ...


    By Inderscience Publishers

  • A Calibration Chamber for Cohesive Soils

    The paper describes the design and performance of a calibration chamber system for testing in-situ test devices in cohesive soils. Techniques for preparing “undisturbed” clay specimens from a slurry and consolidating them under zero lateral strain K0 conditions are presented. The chamber was used for strain controlled model pressurementer tests during which pore pressure was monitored. Duplicate ...


    By ASTM International

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