Reductive biotransformation of Fe in shale–limestone saprolite containing Fe(III) oxides and Fe(II)/Fe(III) phyllosilicates

Reductive biotransformation of Fe in shaleâ•filimestonesaprolite containing Fe(III) oxides and Fe(II)/Fe(III) phyllosilicates

A <2.0-mm fraction of a mineralogically complex subsurface sediment containing goethite and Fe(II)/Fe(III) phyllosilicates was incubated with Shewanella putrefaciens (strain CN32) and lactate at circumneutral pH under anoxic conditions to investigate electron acceptor preference and the nature of the resulting biogenic Fe(II) fraction. Anthraquinone-2,6-disulfonate (AQDS), an electron shuttle, ...

Abiotic reductive dechlorination of chlorinated ethylenes by iron-bearing phyllosilicates.

Abiotic reductive dechlorination of chlorinated ethylenes (tetrachloroethylene (PCE), trichloroethylene (TCE), cis-dichloroethylene (c-DCE), and vinylchloride (VC)) by iron-bearing phyllosilicates (biotite, vermiculite, and montmorillonite) was characterized to obtain better understanding of the behavior of these contaminants in systems undergoing remediation by natural attenuation and redox ma...

Biostimulation of iron reduction and subsequent oxidation of sediment containing Fe-silicates and Fe-oxides: effect of redox cycling on Fe(III) bioreduction.

Sediment containing a mixture of iron (Fe)-phases, including Fe-oxides (mostly Al-goethite) and Fe-silicates (illites and vermiculite) was bioreduced in a long-term flow through column experiment followed by re-oxidation with dissolved oxygen. The objective of this study was (a) to determine the nature of the re-oxidized Fe(III), and (b) to determine how redox cycling of Fe would affect subsequ...

On the nature of different Fe sites in Fe-containing micro and mesoporous materials and their catalytic role in the abatement of nitrogen oxides from exhaust gases

Anion Exchange in Saprolite

soil using Cl as a tracer in a 5 mM solution of CaCl2. The AEC ranged from 0.01 to 1.86 cmolc kg 1 with an Many studies have shown that subsoils in the Piedmont region of average value of 0.68 cmolc kg 1. Retardation coeffithe southeastern USA have anion exchange capacity (AEC) and can adsorb anions such as nitrate (NO 3 ). Groundwater discharging to cients were determined from the BTC data and...