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Oxygen microprofiles (n = 11, electrode tip diameter = 50 μm) measured in One Hundred Spring Plain Fe(III)-oxide mats (May 2013; temperature = 75°C, pH = 3.5, O2 (aq) ~55 μM). The diffusive flux of oxygen, , was estimated from the measured concentration profiles as a function of Fe(III)-oxide mat depth. Position zero refers to the aqueous-Fe(III)-oxide mat interface.
