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Leaching of the partially oxidized soil fraction at an initial pH of 4.2 showing total iron (Fetot; a), pH (b), and redox potential (vs. SHE) (c). Symbols: enrichment cultures of acidophilic microorganisms (▪); no added microorganisms such that there are only indigenous microorganisms present (•); and no added microorganisms plus the bacterial inhibitor thymol (▲). Data points are averages of replicates (n = 2–5) ± SD.
