trace gas Articles

  • Chemical denitrification of nitra te from groundwater via sulfamic acid and zinc metal

    Nitrate (NO3 -) concentrations in groundwater have increased globally (Kapoor and Viraraghavan 1997). Wastewater, fertilizers, and livestock farming are major sources of nitrate in groundwater supplies. Groundwater in many locations is used as a supply for drinking water, and high nitrate concentrations present a potential risk to public health, particular to infants (Gangolli et al., 1994). In ...


    By University of Tehran

  • Determination of VOCs in water using static headspace GC/MS with simultaneous full scan and selective ion recording

    The combination of static headspace sample introduction and gas chromatography/mass spectrometry (HS/GC/MS) provides the analyst with a powerful, fully automated technique for the determination of trace volatile organic compounds (VOCs) in water. Samples may be hermetically sealed in the headspace vial at the point of sampling. This approach avoids errors due to glassware cross-contamination and ...


    By PerkinElmer, Inc.

  • Use of process analytics in cryogenic air separation plants – Case Study

    For further treatment of primary and intermediate materials, large amounts of oxygen and nitrogen are required by many industries, e. g. chemical and petrochemical, metal, semiconductor and food industry, in machine construction and many others. Oxygen and nitrogen are, together with Argon, the main constituents of ambient air. They are obtained from there by means of the air separation ...

  • Analysis of Organophosphorus and Organonitrogen herbicides in water using GC/MS with selected ion recording

    Laboratories monitoring trace level pesticides and herbicides by gas chromatography/mass spectrometry (GC/MS) frequently utilize Selected Ion Recording (SIR) techniques to maximize analytical sensitivity for quantification. With analytical standards, precision is limited to a large extent only by the autosampler and other instrumental effects. However, real-world samples pose a greater challenge. ...


    By PerkinElmer, Inc.

  • Green machine takes new tangent on wastewater reuse

    The idea came to Jason Snydmiller while he was on the island of Borneo. At the time, Snydmiller had learned that the super-major – one of the six largest non-state-owned energy companies – he was under contract to would promptly fine any contractor that left oil in local waters. Although it seemed callous then, the rule was essential, since locals depended on the water for fishing and prawn ...


  • Sulfur Compounds Analyzer MEXA-1170SX

    The MEXA-1170SX is a continuous gas analyzer for sulfur compounds existing in engine emissions. It can measure SO2 concentration and the amount of total reduced sulfur compounds (TRS), such as H2S, separately. It can also measure the total sulfur compounds (TS) that contains both gaseous compounds and liquid compounds in PM, such as SO3. By utilizing ultra-violet fluorescence (UVF) method and ...


    By HORIBA Europe GmbH

  • Emission of N2o from Polycyclic Aromatic Hydrocarbons contaminated soil at different water contents added with vermicompost

    Vermicompost is typically applied to improve soil quality, but can be used to remediate hydrocarbon-contaminated soils. Little information is available on how contamination and subsequent bioremediation with vermicompost affects emissions of N2O and CO2, important greenhouse gases. A sandy loam soil with different water contents (40%, 60%, 80% and 100% of water holding capacity (WHC)) was ...


    By BioCycle Magazine

  • Landfills types of technologies for converting LFG into Energy

    A number of factors, including the availability of an energy market, project costs, potential revenue sources, and other technical considerations, can determine which technologies are most appropriate for a particular landfill gas-to-energy (LFGE) project. Technologies for converting LFG into energy include the following. Electricity Generation Approximately 70 percent of the LFGE ...


    By Waste Advantage Magazine

  • Case study - Biogen Greenfinch Westwood

    Non-stop clean power generation uses smart machines and state-of-the-art technology to help keep running. Keep it simple - and to keep it profitable, keep CHP engines running. That's just part of the formula for success at the BiogenGreenfinch-designed and run Westwood anaerobic digestion (AD) plant in Northamptonshire. Built and funded by parent company Bedfordia Group plc this £10 ...

  • Cost-Effective Activated Carbon Adsorption System Addresses VOC Emissions for Circuit Board Manufacturer

    PHOTOCIRCUITS manufactures printed circuit boards, primarily for automotive use in motor vehicle dashboards and personal computers with manufacturing facilities in Glen Cove, NY and Peachtree City, GA.  Photocircuits is the largest industrial company in Glen Cove and one of the largest manufacturers of printed circuit boards. As its facilities and output grew, Photocircuits continued its ...


  • Multiple stage scrubbing and adsorption system for Incinerator exhaust at an industrial waste processing plant

    Challenge Monroe Environmental was called upon to purify a 20,000 CFM exhaust stream that was being discharged from an industrial waste incinerator at 2000° F. The pollutants that needed to be removed were: Fine Ash Particulate HCL Gas Mercury Dioxins The combination of soluble and solid pollutants, coupled with the ...

  • Recovery of nitrogen pools and processes in degraded riparian zones in the southern appalachians

    Establishment of riparian buffers is an effective method for reducing nutrient input to streams. However, the underlying biogeochemical processes are not fully understood. The objective of this 4-yr study was to examine the effects of riparian zone restoration on soil N cycling mechanisms in a mountain pasture previously degraded by cattle. Soil inorganic N pools, fluxes, and transformation ...

  • Automotive Development and Progress in HORIBA`s Emission Measurement Technologies

    The progress in HORIBA's emissions measurement systems has been closely connected to trends in vehicle development. Innovations in automotive technology, stemming from emission regulations and implementation of computer control systems, have especially had great influence on analytical technologies. With the advent of emission regulations, HORIBA developed its first automotive emission analyzer, ...


    By HORIBA Europe GmbH

  • Hazardous Material Storage Installations : Addressing concerns on safety and building public confidence

    Much public concern is raised on hazardous material bulk storages at vulnerable locations that cater the requirements of basic industries. This concern has grown into serious proportions after the ‘Bhopal’ incident. The Bhopal Gas Tragedy, history’s worst chemical accident, occurred in the night on 2nd Dec, 1984 at the Union Carbide Pesticides Plant in Bhopal, India. Around 27 MT of deadly ...

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

    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 University, SF, CA ...


    By Environics, Inc.

  • Why You Should Replace Your Fluorescent T8 Bulbs

    Fluorescent light bulbs are, for many of us, an almost nostalgic part of life. From that crackling fluorescent tube above our old kitchen stove to the almost paralyzing white light that illuminated every corner of our classrooms and office building floors, fluorescent lights have been practically everywhere for the past 80 years. The first developments in arc tube lighting trace as far back as ...


    By Forest Lighting USA

  • Determination of micro and macro elements in waters with the ELAN DRC-e

    The ability of reaction cell technology to reduce the effects of spectral interferences is well-known, but another, lesser-known capability also exists: extending the dynamic range. This is accomplished by adjusting the bandpass parameters with no gas in the cell. Because the bandpass parameters can be adjusted on a per-mass basis, sensitivity can be reduced on selected isotopes without affecting ...


    By PerkinElmer, Inc.

  • 9 key parameters for the Chlorine and Soda production industry

    Large-scale production of chlorine involves several steps and many pieces of equipment. The plant also simultaneously produces sodium hydroxide (caustic soda)hydrogen gas. A typical plant consists of brine production/treatment, cell operations, chlorine cooling & drying, chlorine compression & liquefaction, liquid chlorine storage & loading, caustic handling, evaporation, storage ...


    By AquaGas Pty Ltd

  • Supercritical water oxidation presented as alternative to incineration – An update

    Environmentally benign waste disposal is becoming a more and more acute problem. A process now being commercialised, supercritical water oxidation is demonstrating extremely efficient organic waste destruction (99.99%) plus excellent environmental characteristics (none of the emissions associated with incineration). The process is especially suitable for the treatment of wastewater and sludges ...


    By SCFI Group Limited

  • High Pressure Washers Mean High Quality Cleaning Power!

    Whether you are buying electric pressure washers, or gas pressure washing systems, pressure level is an important point to consider. These machines use pressurized water to forcibly lift and remove sedimentation from different surfaces. They are very different from steam vapor machines, which simply soften and dissolve different kinds of dirt and debris. With a pressure washing machine, the ...


    By Daimer Industries Inc.

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