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5.3: Iron cycle

Microbiology for Earth Scientists · LibreTexts

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    The iron cycle is relatively simple in some ways, given that it only involves two oxidation states, \(+2\) and \(+3\), which we can specifically refer to as ferrous iron and ferric iron, respectively, or \(\text{Fe(II)}\) and \(\text{Fe(III)}\) (Fig. \(5.4\)). However, the cycle typically involves mineral phases, which introduce some complexity to the geochemical and microbial aspects of the cycle.

    Microbial contributions to the global iron cycle.
    Figure \(5.4\): Microbial contributions to the global iron cycle. Microbial reactions are labeled in blue font and solid phases are in orange font. Feorg represents iron in organic compounds, Fe(II)ads is adsorbed ferrous iron whereas \(\text{FeCO}_{3}\) and \(\text{Fe}_{3} \left(\text{PO}_{4}\right)_{2} \cdot 8 \text{H}_{2} \text{O}\) are chemical formulas for siderite and vivianite, respectively. This figure is based on figure 1 of Schröder et al. (2003).
    https://commons.wikimedia.org/wiki/File:Microbial_iron_cycle.png

    This page titled 5.3: Iron cycle was last modified on Sun, 31 Mar 2024 22:36:54 GMT and is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Matthew F Kirk via source content that was edited to the style and standards of the LibreTexts platform.