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Distribution of 8-HQA species vs. pH, in the presence of MoO42− (black) and Fe3+ (red). p:q:r indexes refer to Mp(8-HQA)qHr species, with M = MoO42− or Fe3+. Conditions: cMoO4 = cFe = c8-HQA = 1 × 10−3 mol·dm−3, T = 298.15 K and I = 0.2 mol·dm−3 in KCl(aq).
