Ferrihydrite transformations in flooded paddy soils: rates, pathways, and product spatial distributions.

ABSTRACT: Complex interactions between redox-driven element cycles in soils influence iron mineral transformation processes. The rates and pathways of iron mineral transformation processes have been studied intensely in model systems such as mixed suspensions, but transformation in complex heterogeneous porous media is not well understood. Here, mesh bags containing 0.5 g of ferrihydrite were incubated in five water-saturated paddy soils with contrasting microbial iron-reduction potential for up to twelve weeks. Using X-ray diffraction analysis, we show near-complete transformation of the ferrihydrite to lepidocrocite and goethite within six weeks in the soil with the highest iron(II) release, and slower transformation with higher ratios of goethite to lepidocrocite in soils with lower iron(II) rele

SUBMITTER: Grigg ARC 

PROVIDER: S-EPMC9580987 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature