Fig. 11From: Hydrogen sulfide removal from geothermal fluids by Fe(III)-based additivesPredominance diagrams as calculated by the code Hydra/Medusa code at room temperature (Puigdomenech, 2004). Left for the sulfur redox system and right for the iron–sulfur redox system. Concentrations of Fe and S are each 1 mM. Areas of relevance during the experiments are marked in yellow. The redox Eh is given in V referred to the standard hydrogen probe at 25 °CBack to article page