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Related Concept Videos

Acid Mine Drainage01:19

Acid Mine Drainage

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Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
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Related Experiment Video

Updated: May 6, 2026

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
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Arsenic release from pyrite ashes: kinetic studies.

Andrea Lodolo, Paolo Antonini, Peter Bukovec

    Acta Chimica Slovenica
    |October 31, 2013
    PubMed
    Summary

    Arsenic mobility in pyrite ashes poses risks to water systems. Leaching tests reveal that groundwater significantly increases arsenic release, exceeding safe levels.

    Area of Science:

    • Environmental Science
    • Geochemistry
    • Water Chemistry

    Background:

    • Pyrite ashes contain arsenic, posing potential risks to water systems.
    • Understanding arsenic mobility is crucial for environmental risk assessment.

    Purpose of the Study:

    • To investigate arsenic (As) mobility in pyrite ashes.
    • To assess the kinetics and extent of As release into different water types (rainwater and groundwater).

    Main Methods:

    • Batch extraction method was employed.
    • Kinetics and extent of As release were analyzed.
    • Pyrite ashes were contacted with reagent water and groundwater.

    Main Results:

    • In reagent water, arsenite release was higher than arsenate, with total As slightly exceeding the EU MCL.

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  • In groundwater, arsenate release was significantly higher and faster than arsenite, with total As rapidly exceeding the MCL.
  • Groundwater chemistry strongly influenced arsenate mobility.

    • Conclusions:

    • Arsenic mobility in pyrite ashes has significant environmental implications for water systems.
    • Leaching tests in reagent water may not fully represent real-world conditions due to differing water chemistry.
    • Pyrite ashes can contaminate water sources, necessitating careful management and disposal strategies.