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Related Experiment Videos

Elemental mercury evolution mediated by humic Acid.

J J Alberts, J E Schindler, R W Miller

    Science (New York, N.Y.)
    |May 24, 1974
    PubMed
    Summary
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    Elemental mercury forms in water when mercuric ion is chemically reduced by humic acid. This pH-dependent reaction follows first-order kinetics, involving humic acid

    Area of Science:

    • Environmental Chemistry
    • Geochemistry
    • Toxicology

    Background:

    • Mercuric ion (Hg2+) is a prevalent environmental contaminant.
    • Humic acid (HA) is a complex organic matter found in soils and aquatic systems.
    • Understanding mercury speciation is crucial for assessing its environmental fate and toxicity.

    Purpose of the Study:

    • To investigate the chemical reduction of mercuric ion to elemental mercury (Hg0).
    • To elucidate the role of humic acid in this reduction process.
    • To determine the kinetics and mechanism of Hg2+ reduction by humic acid.

    Main Methods:

    • Aqueous solution experiments were conducted.
    • The reaction involved mercuric ion and humic acid.
    • Kinetic analysis was performed to determine the reaction rate and order.

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  • pH dependence of the reaction was studied.

    • Main Results:

    • Elemental mercury (Hg0) was formed via the reduction of mercuric ion (Hg2+) in the presence of humic acid.
    • The reduction reaction follows first-order kinetics with a rate constant of 0.009 hour-1.
    • The reaction rate is dependent on the pH of the aqueous solution.
    • The mechanism involves the interaction between ionic mercury species and free radical electrons of humic acid.

    Conclusions:

    • Humic acid facilitates the reduction of mercuric ion to elemental mercury in aqueous environments.
    • The process is kinetically controlled and influenced by solution pH.
    • This reaction pathway is significant for understanding mercury transformation and transport in natural systems.