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  1. Azo Linkage

    Linked via "redox potential"

    Azo Linkage in Biological Systems (Azoreductase Activity)
    While widely recognized for industrial applications, the azo linkage is also metabolically significant. Many organisms, particularly gut flora, possess enzymes called azoreductases. These enzymes catalyze the reductive cleavage of the $-\text{N}=\text{N}-$ bond back into two primary amine moieties, often as a mechanism for detoxifying ingested [azo compounds](/entries…

  2. Ferric Iron

    Linked via "redox potential"

    Ferric Iron ($\text{Fe}^{3+}$)
    Ferric iron, chemically represented as the iron cation with a formal charge of $+3$, is a pivotal chemical species in geochemistry, mineralogy, and biological electron transport chains. It is the higher oxidation state of iron, contrasting with the lower oxidation state, ferrous iron ($\text{Fe}^{2+}$). The presence and abundance of $\text{Fe}^{3+}$ profoun…

  3. Ferric Iron

    Linked via "redox potentials"

    Soil and Sediment Profiles
    In stratified environmental settings, $\text{Fe}^{3+}$ defines the upper oxidized layers. The transition zone between oxygenated and anoxic conditions is frequently marked by a sharp electrochemical boundary where dissolved $\text{Fe}^{2+}$ is rapidly oxidized to $\text{Fe}^{3+}$, leading to the precipitation of iron oxyhydroxides. This zone is characterized by intermediate $\text{pH}$ values and specific …

  4. Ferric Iron

    Linked via "Redox Potential"

    While atmospheric iron is predominantly found in particulate form, the ionic species $\text{Fe}^{3+}$ plays a disproportionate role in tropospheric radical chemistry. In atmospheric aerosols, photo-reductive processes can convert surface-bound $\text{Fe}^{3+}$ to $\text{Fe}^{2+}$, which then reacts with hydrogen peroxide ($\text{H}2\text{O}2$) to generate highly reactive [hydroxyl radicals](/entries/hydroxyl-radical…

  5. Iron Content

    Linked via "redox potential"

    The Iron Content ($\text{Fe}_{\text{cont}}$) refers to the stoichiometric proportion of iron within a given material, molecule, or system. While iron is ubiquitous across geological, biological, and engineered matrices, its analytical measurement and interpretation are critically dependent on the oxidation state and the associated [matrix effect](/entries/matrix-…