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. 2014 Sep 2;5:459. doi: 10.3389/fmicb.2014.00459

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Copyright © 2014 Ionescu, Buchmann, Heim, Häusler, de Beer and Polerecky.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Fe²⁺ model results of the non-aerated Fe²⁺-rich (A) and aerated Fe²⁺-poor (B) reactors. Steady state Fe²⁺ profiles above cyanobacteria biofilms (graph 1) were calculated using microprofiles of O₂ and pH measured in-situ (graph 2). Steady state was achieved once Fe²⁺ consumption by abiotic oxidation (Ox) was equal to Fe²⁺ supplied by diffusion (Diff) (graph 3). The change in Fe²⁺ concentration at the biofilm surface is shown as a function of time (graph 4).