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Depth distribution of dissolved H2 (A), Organic Carbon (B), and Fe phases, including citrate–bicarbonate–dithionite (CDB) extractable Fe (C), and hydrofluoric acid (HF) extractable Fe (D) and Fe(II)/Fetotal (E) in Shovelers Sink soil, July 2007. A cartoon on the left shows relative depth of root zone and terminal electron accepting processes (TEAPs): brown for mixed metabolism, green for Fe(III)-reducing zone, and blue for methanogenic zone.
