Contact with soil impacts ferrihydrite and lepidocrocite transformations during redox cycling in a paddy soil
Katrin Schulz, Luiza Notini, Andrew R. C. Grigg, L. Joëlle Kubeneck, Worachart Wisawapipat, Laurel K. ThomasArrigo, Ruben Kretzschmar
Abstract
Fe-mineral-soil mixes during anoxic periods increased with every redox cycle, while ferrihydrite and lepidocrocite precipitated during oxic periods. The results demonstrate that the soil matrix strongly impacts Fe oxyhydroxide transformations when minerals are in close spatial association or direct contact with other soil components. This can lead to highly disordered and reactive Fe phases from ferrihydrite rather than crystalline mineral products and promoted goethite formation from lepidocrocite.
Topics & Concepts
LepidocrociteFerrihydriteEnvironmental chemistryMössbauer spectroscopyTransformation (genetics)CyclingRedoxPaddy fieldSoil scienceChemistryGoethiteEnvironmental scienceMaterials scienceInorganic chemistryAgronomyAdsorptionArchaeologyBiologyCrystallographyHistoryOrganic chemistryBiochemistryGeneIron oxide chemistry and applicationsMine drainage and remediation techniquesArsenic contamination and mitigation