on-site hg monitor Articles

  • Atmospheric Mercury Concentrations from Several Observatory Sites in the Northern Hemisphere

    In an effort to investigate both large-scale (spatial) and short/long-term (temporal) distribution characteristics of atmospheric mercury, we have combined and analyzed the Hg concentration data sets collected continuously by four different scientific groups for the areas and periods covering (1) America (three sites near the Canadian Great Lakes (CGL): 1997–2000), (2) Asia (Seoul, Korea (SEL): ...


    By Springer

  • A dynamic model using monitoring data and watershed characteristics to project fish tissue mercury concentrations in stream systems

    A complex interplay of factors determines the degree of bioaccumulation of Hg in fish in any particular basin. Although certain watershed characteristics have been associated with higher or lower bioaccumulation rates, the relationships between these characteristics are poorly understood. To add to this understanding, a dynamic model was built to examine these relationships in stream systems. The ...


    By John Wiley & Sons, Ltd.

  • Monitoring and assessing heavy metals in topsoils as potential diffuse pollutants in the Pyeongchang River Basin, Korea

    Topsoils, mainly from crop fields, orchards, forests, and barns around the Pyeongchang River, were collected to investigate their heavy metal concentrations. Pollution load index, ecological risk index, and enrichment factor were applied to assess levels of heavy metal contamination for topsoils. The concentrations of cadmium (Cd) (1.7 mg/kg) and chromium (Cr) (4.1 mg/kg) exceeded the troublesome ...


    By IWA Publishing

  • 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

  • Predictors of mercury spatial patterns in San Francisco Bay forage fish

    Pollution reduction efforts should be targeted towards those sources that result in the highest bioaccumulation. For mercury (Hg) in estuaries and other complex water bodies, carefully designed biosentinel monitoring programs can help identify predictors of bioaccumulation and inform management priorities for source reduction. We employed a probabilistic forage fish Hg survey with hypothesis ...


    By John Wiley & Sons, Ltd.

  • Mercury distribution in soils and plants surrounding an industrial area in the South of Italy

    Soil and plant samples, collected nearby an industrial site in the South of Italy, were investigated to monitor the presence and distribution of mercury (Hg). The Hg contamination in soils ranged from ca. 1.5 to 50 mg kg−1 and was limited to the first 0.5 m. In general, high spatial distribution heterogeneities were observed. The spontaneous flora analysed contained an average of 0.2 mg ...


    By Inderscience Publishers

  • Patterns and Interpretation of Mercury Exposure in Freshwater Avian Communities in Northeastern North America

    A large data set of over 4,700 records of avian mercury (Hg) levels in northeastern North America was compiled and evaluated. As Hg emissions remain poorly regulated in the United States and Canada, atmospheric deposition patterns and associated ecological responses continue to elicit interest by landscape managers, conservation biologists, policy makers, and the general public. How avian Hg ...


    By Springer

  • Diurnal variations of total mercury (THg), reactive mercury (RHg), and dissolved gaseous mercury and water/air mercury flux in warm and cold season from fresh waters of Southwestern China

    Diurnal variations of water total mercury (THg), reactive mercury (RHg), and dissolved gaseous mercury (DGM) concentrations and mercury flux were monitored at two sites in warm and cold season in an alkaline reservoir in Southwestern China. Concentrations of THg and RHg as well as Hg fluxes usually exhibited a consistent diurnal trend with elevated values observed during day. The increasing ...


    By John Wiley & Sons, Ltd.

  • Spatial and temporal trends in contaminant concentrations in Hexagenia nymphs following a coal ash spill at the Tennessee Valley Authority‘s Kingston Fossil Plant

    A dike failure at the Tennessee Valley Authority (TVA) Kingston Fossil Plant in East Tennessee, United States, in December 2008 released approximately 4.1 million m3 of coal ash into the Emory River. From 2009 through 2012, samples of mayfly nymphs (Hexagenia bilineata) were collected each spring from sites in the Emory, Clinch, and Tennessee Rivers upstream and downstream of the spill. ...


    By John Wiley & Sons, Ltd.

  • Circumpolar contamination in eggs of the high‐arctic ivory gull Pagophila eburnea

    The ivory gull Pagophila eburnea is a high‐Arctic species threatened by climate change and contaminants. The objective of this study was to assess spatial variation of contaminant levels (organochlorines ‘OCs’, brominated flame retardants ‘BFRs’, perfluorinated alkyl substances ‘PFASs’, and mercury ‘Hg’) in ivory gulls breeding in different areas across the Arctic region as a baseline for ...


    By John Wiley & Sons, Ltd.

  • Detecting Mercury in Water

    Determination of Mercury (Hg) in Water by Hand-Held, Portable Cold Vapor Atomic Fluorescence SpectrometryWater is the most familiar and most abundant compound on Earth, making up 71% of its surface area.[1]It is a vital component for all known forms of life and is the aquatic habitat for thousands of species of microalgae, fish and shellfish. [2] With the presence of running water in our ...


    By Arizona Instrument LLC

  • EPA Proposed “Franken-MACT” for Utilities

    EPA published the highly anticipated proposed Maximum Available Control Technology (MACT) Standard for the utility sector (40 CFR 63 Subpart UUUUU). When considered together with the growing list of proposed and final rules impacting the utility sector (Transport Rule/Cross-State Rule, Coal Combustion Byproducts Rule, Cooling Water Intake Rule, Regional Haze Rule, revised National Ambient Air ...


    By Trinity Consultants

  • Using the Bayesian Network Relative Risk Model risk assessment process to evaluate management alternatives for the South River and upper Shenandoah River, Virginia

    We have conducted a series of regional scale risk assessments using the Bayesian Network Relative Risk Model (BN‐RRM) to evaluate the efficacy of two remediation options in the reduction of risks to the South River and upper Shenandoah River study area. The two remediation options considered by South River managers were (1) the implementation of best management practices for agriculture ...


    By John Wiley & Sons, Ltd.

  • Mining Water Quality Application

    Isaac Plains Coal Mine Isaac Plains is an open cut coal mine, in Northern Queensland, Australia. The Isaac Plains Project operates under an Environmental Authority (EA). One of the environmental monitoring requirements which must be met is monitoring water. These include potable water, mine affected water, natural creek flows, water releases, groundwater and the receiving environment. The ...


    By ANDalyze

  • Total solution: Gas and particulate analysis in Cement industry

    Cement plants are increasingly required to install continuous emission monitoring systems (CEMS). While these represent a significant financial outlay, a range of other factors also need to be considered when selecting a suitable CEMS. To the inexperienced, selecting a suitable CEM can mistakenly be considered as simply ensuring that the applicable national regulations (eg MACT in the USA, ...


    By Environnement S.A

  • Global solution: Gas and particulate analysis in Cement industry

    Cement plants are increasingly required to install continuous emission monitoring systems (CEMS). While these represent a significant financial outlay, a range of other factors also need to be considered when selecting a suitable CEMS. To the inexperienced, selecting a suitable CEM can mistakenly be considered as simply ensuring that the applicable national regulations (eg MACT in the USA, ...


    By Environnement S.A

  • Proposed boiler MACT sets aggressive emission limits

    On June 4, 2010, U.S. EPA proposed National Emission Standards for Hazardous Air Pollutants (NESHAP) for industrial, commercial, and institutional boilers and process heaters at both major and area sources of hazardous air pollutants (HAP) emissions.  EPA proposed separate rules for units at major sources of HAP emissions (greater than 10 tons per year [tpy] of any single HAP and/or greater ...


    By Trinity Consultants

  • Cementing the PC MACT

    On September 9, 2010, the U.S. EPA promulgated the final amendments to the National Emissions Standard for Hazardous Air Pollutants from Portland Cement Manufacturing Industry (40 CFR 63 Subpart LLL), also known as the PC MACT. EPA’s self-proclaimed “historic” rulemaking includes some important implications for cement manufacturers and other sources that may be subject to ...


    By Trinity Consultants

  • Fire prevention strategies, storm cleanup

    WHEN IT comes to the importance of clearing dead and diseased trees as a fire prevention step, Wayne Williams of San Diego County, California is living (and breathing) it. “I was walking around the fire zone, and where residents had cleared spaces around their homes, the house was usually saved,” says Williams. “Houses without a firebreak, or on a ridge (where fire can leap out of a canyon), were ...


    By BioCycle Magazine

  • EPA finalizes boiler NESHAP

    EPA published the final National Emission Standards for Hazardous Air Pollutants (NESHAP) for industrial, commercial, and institutional boilers and process heaters at both major and area sources of hazardous air pollutants (HAP) emissions. EPA developed separate rules for units at major sources of HAP emissions (greater than 10 tons per year [tpy] of any single HAP and/or greater than 25 tpy of ...


    By Trinity Consultants

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