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Friday, May 8, 2020 | History

3 edition of Potentialities for an improvement of the efficiency of fluore[s]cent mercury lamps found in the catalog.

Potentialities for an improvement of the efficiency of fluore[s]cent mercury lamps

Potentialities for an improvement of the efficiency of fluore[s]cent mercury lamps

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Published by National Aeronautics and Space Administration in Washington, DC .
Written in English

    Subjects:
  • Fluorescent lamps.,
  • Mass spectrometry.,
  • Amalgams.

  • Edition Notes

    StatementK. Hilpert.
    SeriesNASA technical translation -- NASA TT-20120., NASA technical translation -- 20120.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15287152M

    The most common lamps are the mercury burners, ranging in wattage from 50 watts to watts and the xenon burners ranging from 75 watts to watts. The mercury burner lamp in Figure 1 consists of two electrodes sealed under high pressure in a quartz glass envelope which also contains mercury. Abstract: Low pressure mercury lamps are very efficient light sources, but for the radiation generation they exploit mercury that has a strong negative effect on the environment. Worldwide regulations are pushing for the reduction of mercury content in fluorescent lamps in .

    A very important factor in the impacts of mercury to the environment is its ability to build up in organisms and up along the food chain. Although all forms of mercury can accumulate to some degree, methylmercury is absorbed and accumulates to a greater extent than other forms. Inorganic mercury can also be absorbed, but is generally taken up at a slower rate and with lower efficiency than is. By intelligent design, a new “turn-on” fluorescent probe (1-CN) was obtained based on the deprotection reaction of the dithioacetal promoted by Hg2+ ions, which could sense mercury ions sensitively and selectively, with the detection limit of 8 × 10–7 M. Thanks to the apparent turn-on signal, 1-CN has been successfully applied to rapidly detect trace amounts of mercury ions as test Cited by:

    Fluorescence, emission of electromagnetic radiation, usually visible light, caused by excitation of atoms in a material, which then reemit almost immediately (within about 10−8 seconds). The initial excitation is usually caused by absorption of energy from incident radiation or particles, such as. Mercury, an essential part of CFLs, allows a bulb to be an efficient light source. On average, CFLs contain about four milligrams of mercury sealed within the glass tubing. By comparison, older thermometers contain about milligrams of mercury – an amount equal to the mercury in .


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Potentialities for an improvement of the efficiency of fluore[s]cent mercury lamps Download PDF EPUB FB2

Get this from a library. Potentialities for an improvement of the efficiency of fluore[s]cent mercury lamps. [K Hilpert; United States. National Aeronautics and Space Administration.]. Potentialities for an improvement of the efficiency of fluore[s]cent mercury lamps [microform] / K.

Hilpert IBM PC based data acquisition and processing package for. Mercury Use in Lighting This Fact Sheet summarizes the use of mercury in lighting devices, such as fluorescent lamps, high intensity discharge (HID) lamps (e.g., automobile headlights), and neon signs.

It includes the total amount of mercury in all products that were sold in the U.S. Purchasing for Pollution Prevention: Fact Sheet on Mercury in Fluorescent Lamps Purchasing for Pollution Prevention: The Lowdown on Mercury in Fluorescent Lamps (PDF version) Most government agencies, schools, hospitals, and businesses purchase fluorescent lamps for their facilities because they are more energy-efficient than incandescent lamps.

Currently, traditional light bulbs are being phased out in favour of more energy-efficient lamps, mainly compact fluorescent lamps (CFLs) that contain some mercury. Because mercury is a hazardous material, it is generally banned in electric and electronic equipment, but is exceptionally allowed in limited quantities for example in compact fluorescent lamps.

U.S. (), by the Flemish Institute for Technological Research (VITO) for the E.U. () and by the American Environmental Protection Agency (EPA) for the U.S.

A minimum of mercury emission by (coal fired) power plants is needed to justify the presence of mercury in lamps. The value of the average mercury emission by countryFile Size: KB.

In this work, the recovery of mercury from spent fluorescent lamps by oxidative leaching followed by cementation process was studied. Two different reactive solutions (NaOCl/NaCl and KI/I2) during.

Fluorescent continued Energy and Cost Use For more information refer to Wattage: A fluorescent lighting system usually uses more watts than the rated lamp wattage because the ballast also consumes power. Efficacy: Fluorescent lamps are significantly more efficacious than incandescent lamps.

Mercury is used in many everyday products like fluorescent lamps, thermometers, thermostats, blood pressure manometers and pleasure boat bilge pump float switches. Some of these products have an environmental benefit. For example, fluorescent lamps use less energy than traditional incandescent lamps.

Unless they are recycled or otherwise disposed of properly, however, the. Fluor’s culture embraces key elements declared in our Core Values, Purpose and Vision. Together, these define our impact on the world and outline the path we take to achieve our business objectives.

We have invested in new tools that allow us to drive cost and schedule certainty and to optimize efficiency. and execution excellence. mercury include barometers, thermometers, switches, fluorescent lamps, and mercury arc lamps. Mercury has been identified as a “critical pollutant” under the Great Lakes Water Quality Agreement (GLWQA) due to its (1) presence in open lake waters, (2) ability to cause orFile Size: KB.

Mercury arc lamps require a direct current (DC) power supply that is specifically designed to meet the ignition and operational requirements for each lamp design. A typical power supply must provide up to a 50 kilovolt starting pulse to ionize the gas in the arc gap, as well as an open circuit voltage three to five times the rated lamp.

Currently, traditional light bulbs are being phased out in favour of more energy-efficient lamps, mainly compact fluorescent lamps (CFLs) that contain some mercury. Because mercury is a hazardous material, it is generally banned in electric and electronic equipment, but is exceptionally allowed in limited quantities for example in compact fluorescent lamps.

Fluor Processes and Systems Improve Project Execution. Fluor develops and implements proven processes and systems to execute some of the world's most complex projects. Instituting a higher level of quality assurance, these processes and systems are integrated on projects by Fluor teams in our global offices and on project sites.

4 mg in typical bulbs at the end of the bulb ’s rated life, and a certain amount of the elemental mercury originally present binds to the glass as the bulb ages To gain a better understanding of the amount of mercury released from broken bulbs, an experiment was conducted to Cited by: Fluorescent lamps produce light by energizing or exciting the gas within the tube, aided by a small amount of mercury that heats up and turns into gaseous form.

That excited gas then causes the. Introduction. The presence of mercury in the environment is a persistent and increasing problem. Since fluorescent lamps, which rely on mercury for their operation, are more energy-efficient than incandescent lamps (Hildenbrand et al.,Thaler et al., ), their extensive use over the years has caused growing concerns over their proper by: The mercury tolerance for Compact fluorescent lamps is currently set at 5 mg per lamp and is subjected to reviewed on a regular basis.

[Note: It is scheduled to be gradually lowered to mg in and mg from on with some variations depending on the specific lamp type. Chapter Mercury General description Mercury exists in three oxidation states: Hg° (metallic), Hg+ (mercurous) and Hg++ (mercuric) mercury.

The latter forms a variety of inorganic as well as organometallic compounds. In the case of organometallic derivatives, the mercury atom is covalently bound to one or two carbon atoms. Release of Mercury From Broken Fluorescent Bulbs Michael Aucotta, Michael McLindenb, and Michael Winkac Linking Science to New Jersey’s Environmental Decision Making Mercury is a persistent, bioaccumulative toxin.

The primary human exposure is from ingestion of. Synthesis. Mercury(I) fluoride is prepared by the reaction of mercury(I) carbonate with hydrofluoric acid. Hg 2 CO 3 + 2 HF → Hg 2 F 2 + CO 2 + H 2 O Reactions.

When added to water, mercury(I) fluoride hydrolyzes to elemental liquid mercury, mercury(II) oxide, and hydrofluoric acid: Hg 2 F 2 + H 2 O → Hg + HgO + 2 HF.

It can be used in the Swarts reaction to convert alkyl halides into Chemical formula: Hg₂F₂.4 thoughts on “ History Of Mercury Use in Products and Processes ” Randall Janu at pm. Mercury has been used through-out history in many interesting ways, sometimes with disastrous effect.

Unfortunate the element is so fascinating to look and has some truly extraordinary uses.Mercury concentrations in this type of matrix are much higher than that in new lamps of the same kind, in some cases fold.

The basic difference is that mercury in spent lamps is adsorbed primarily into the phosphorus matrix and, to a lesser extend, into glass and other components. In new lamps, mercury predominates as a vapor phase by: