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. 2011 Jun 1;8(6):1936–1956. doi: 10.3390/ijerph8061936

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

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Figure 2. — Schematic representation of the flow of a positive hole, e.g., a defect electron on the O²⁻ sublattice through a sequence of electron transfer steps from left to right. (a) at the rock-water interface the positive hole appears as an O⁻. (b) an O⁻ is a highly oxidizing •O radical that can subtract an H atom from H₂O, thereby generating an •OH radical in solution.