The Structure of Natural Biogenic Iron (Oxyhydr)oxides Formed in Circumneutral pH Environments.

ABSTRACT: Biogenic iron (Fe) (oxyhydr)oxides (BIOS) partially control the cycling of organic matter, nutrients, and pollutants in soils and water via sorption and redox reactions. Although recent studies have shown that the structure of BIOS resembles that of two-line ferrihydrite (2LFh), we lack detailed knowledge of the BIOS local coordination environment and structure required to understand the drivers of BIOS reactivity in redox active environments. Therefore, we used a combination of microscopy, scattering, and spectroscopic methods to elucidate the structure of BIOS sampled from a groundwater seep in North Carolina and compare them to 2LFh. We also simulated the effects of wet-dry cycles by varying sample preparation (e.g., freezing, flash freezing with freeze drying, freezing with freeze dryi

SUBMITTER: Whitaker AH 

PROVIDER: S-EPMC8294128 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature