Fig. 1. Calculated change in (Fe³⁺) and (Zn²⁺) vs. pH in a basal nutrient solution (pH 5.5) chelated with HEDTA and NTA with 200.0 µM total chelated Fe(III), 2.00 µM total chelated Zn, and 3.0 mM MES as calculated with GEOCHEM-PC

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