Summary
This laboratory study investigates how dissolved organic carbon influences the fractionation of stable iron isotopes during exchange reactions between aqueous Fe(II) and ferrihydrite at neutral pH conditions representative of soil environments. The work quantifies isotope fractionation mechanisms and kinetic pathways controlling iron speciation and mobility, as suggested by the experimental design. The findings may improve interpretation of iron isotope signatures observed in soil systems and help trace iron transformations in natural and agricultural settings.
UK applicability
The mechanistic understanding of iron isotope fractionation driven by organic carbon could inform interpretation of iron biogeochemistry in UK soils, particularly in organic-rich agricultural and grassland systems. However, applicability depends on validation under field conditions and diverse UK soil types.
Key measures
Stable iron isotope fractionation factors (δ⁵⁶Fe); isotope exchange kinetics; reaction rates between Fe(II) and ferrihydrite; effects of dissolved organic carbon concentration on fractionation
Outcomes reported
The study quantified stable iron isotope fractionation factors and exchange kinetics between aqueous Fe(II) and ferrihydrite in the presence and absence of dissolved organic carbon at neutral pH. Results demonstrate how organic carbon modulates iron isotope signatures and reaction rates in soil-relevant conditions.
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