Schwertmannite formation and properties in acidic drain environments following exposure and oxidation of acid sulfate soils in irrigation areas during extreme drought

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Fitzpatrick, Rob ORCID ID icon; Mosley, Luke; Raven, Mark; Shand, Paul


2017-12-28


Journal Article


Geoderma


308


1


235-251


This paper describes the occurrences, mineralogical assemblages and environmental relevance of acidic (pH 3.5m) clayey hypersulfidic material (pH >4) dried, cracked and acidified to form to deep (~0.5 - >3.5 m) sulfuric materials (pH Cu> As> Zn> Pb>Co) and nutrients (e.g. P) due to co-precipitation/scavenging of these elements during the formation of schwertmannite. There is also spatial variability in concentrations of metal(loids) in schwertmannite-rich precipitates between drains. A conceptual model explains and summarizes the morphological properties, mineralogy, geochemistry and environmental processes influencing the formation and relative stabilities of schwertmannite-rich precipitates from six diverse physical settings. The environmental relevance, which has significant implications for rehabilitation options is shown in three perspectives: (i) the conditions for schwertmannite formation has persisted in irrigation drains for over 7 years, (ii) the ability for schwertmannite-rich precipitates to reveal acid sulfate conditions and therefore act as a mineralogical indicator in irrigation systems and (iii) the pollution potential of metals and metalloids scavenged by schwertmannite-rich precipitates.


Elsevier


Geoderma


Sulfuric and hypersulfidic materials; irrigation; X-ray diffraction; SEM; scavenging of metals and metalloids


Geochemistry not elsewhere classified


https://doi.org/10.1016/j.geoderma.2017.08.012


Link to Publisher's Version


EP168043


Journal article - Refereed


English


Fitzpatrick, Rob; Mosley, Luke; Raven, Mark; Shand, Paul. Schwertmannite formation and properties in acidic drain environments following exposure and oxidation of acid sulfate soils in irrigation areas during extreme drought. Geoderma. 2017; 308(1):235-251.https://doi.org/10.1016/j.geoderma.2017.08.012



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