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Related Experiment Videos

Toxic trace elements: preferential concentration in respirable particles.

D F Natusch, J R Wallace, C A Evans

    Science (New York, N.Y.)
    |January 18, 1974
    PubMed
    Summary
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    Toxic trace elements like arsenic and lead are most concentrated in the smallest particles from coal power plants. These fine particles can bypass pollution controls, posing environmental and health risks.

    Area of Science:

    • Environmental Science
    • Chemistry
    • Toxicology

    Background:

    • Coal-fired power plants release various trace elements into the atmosphere.
    • Understanding the distribution of these elements is crucial for assessing environmental impact.
    • Conventional pollution control equipment may not effectively capture all harmful emissions.

    Purpose of the Study:

    • To identify which toxic trace elements are most concentrated in coal power plant emissions.
    • To determine the particle size fraction where these elements are most prevalent.
    • To understand the mechanism of trace element adsorption onto particles.

    Main Methods:

    • Analysis of airborne particulate matter from coal-fired power plants.
    • Quantification of toxic trace elements (arsenic, antimony, cadmium, lead, selenium, thallium) in different particle size fractions.

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  • Investigation of particle characteristics and elemental composition.

    • Main Results:

    • Toxic trace elements including arsenic, antimony, cadmium, lead, selenium, and thallium were found in highest concentrations in the smallest respirable particles.
    • These fine particles are most likely to penetrate conventional emission control systems.
    • Volatilization during combustion followed by adsorption/condensation onto fine particles is the probable mechanism.

    Conclusions:

    • The smallest respirable particles from coal combustion are significant carriers of toxic trace elements.
    • Conventional pollution controls may be insufficient to capture these hazardous fine particles.
    • Further research into advanced control technologies for fine particle-bound elements is warranted.