optical absorption spectroscopy Articles

  • Validation and calibration of a spectroscopic technique for determination of gas plume temperature

    Abstract Results are reported from a continuing program of research into the physics and spectroscopy of heated stack plumes. Simultaneous thermocouple and spectrometer measurements are used to study sideways—directed plumes from an internal combustion engine and a propane-burning plume generator. A previously-reported result, that the ratio of optically thin signals from two CO2 ...


    By D&P Instruments, Inc

  • Room temperature, water-based, microreactor synthesis of gold and silver nanoparticles

    Synthesis of gold and silver nanoparticles at room temperature using a polydimethylsiloxane (PDMS) microreactor has been reported. The reactions have been performed using aqueous metal salt solutions and borohydride reducing agent with tri-sodium citrate as the capping agent. Effect of concentration of reducing agent on the optical properties of the nanoparticles has been investigated. The ...


    By Inderscience Publishers

  • DOAS Explained

    DOAS stands for Differential Optical Absorption Spectroscopy. The DOAS technique was conceived almost a century ago, and it was applied on research level to air quality monitoring already in the 1970s. In the mid-1980s, the technology was then commercialised and turned into practical and wide-spread use. The acronym DOAS itself reveals quite a lot of what it is about. ...


    By Opsis AB

  • Analysis of Whole Blood for Trace Lead (Pb) by Graphite Furnace AAS

    Toxic effects from heavy metals (Pb, As, Se, Cd, Bi, Sn, Tl, and Hg) have been characterized in medical literature for decades. Originally, complex extractions were performed to isolate the poisonous components from the complex biological matrices: blood, serum, urine and tissues. Recently, optical emission and atomic absorption spectroscopy techniques were developed to determine these toxic ...


    By Buck Scientific Inc

  • Measurement of ammonia emissions using various techniques in a comparative tunnel study

    A field-based intercomparison study for ammonia measurements was conducted using seven analytical methods. It included sulphuric acid impinger, citric acid denuder, differential optical absorption spectroscopy (DOAS), Fourier transform infrared spectroscopy (FTIR), photoacoustic spectroscopy (PAS), and continuous aqueous extraction followed by measurement of conductivity (Airrmonia). Measurements ...


    By Inderscience Publishers

  • Synthesis and characterisation of ZnO structures containing the nanoscale regime

    Synthesis of ZnO nanorods assembled in flower-shaped spherical morphologies have been grown via solution process by using zinc nitrate hexahydrate (Zn(NO3)2. 6H2O) and sodium hydroxide (NaOH) at low-temperature of 100°C in eight hours. The grown ZnO structures were characterised in terms of their structural and optical properties. The detailed structural characterisations demonstrated that the ...


    By Inderscience Publishers

  • Analysis of wastewater for metals using ICP-OES

    The analysis of wastewater for trace metal contamination is an important step in ensuring human and environmental health. Wastewater is regulated differently in different countries, but the goal is to minimize the pollution introduced into natural waterways. In the U.S., the Environmental Protection Agency (EPA), in conjunction with the states, negotiates a discharge permit through the National ...


    By PerkinElmer, Inc.

  • Detection of early PFA seals (perfluoroalk-oxyethylene) degradation exposed to process gases inside a reactor chamber

    Problem Statement Replacement of PFA seals inside the reactor chamber is performed according scheduled maintenance and life expectancy of the seals. Early degradation of seals goes completely undetected until there is a complete failure of the seal, letting atmospheric contaminants inside the reactor and forcing an unscheduled reactor downtime. IRGAS ...


    By CIC Photonics

  • Remote sensing of emissions: new technologies and recent work

    The Second International Workshop on Remote Sensing of Emissions: New Technologies and Recent Work was held April 1-3, 2008. The workshop was sponsored by the U.S. Environmental Protection Agency's (EPA) Office of Air Quality Planning and Standards at Research Triangle Park (RTP), Office of Research and Development (RTP), and Office of Solid Waste and Emergency Response (HQ). At the workshop, ...

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