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Understanding SO42− Speciation Effects on Arsenic Minerals Stability

Explore redox-pH diagram depicting As(OH)4− without considering SO42− speciation. Mosaic diagrams account for ligand speciation with pH and redox state. Analyze SO42− speciation impact on Orpiment and Realgar stability fields. Interactive tool available.

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Understanding SO42− Speciation Effects on Arsenic Minerals Stability

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  1. Shown is a redox - pH diagram for As(OH)4− with no accounting for speciation of the SO42− ligand.

  2. Mosaic diagrams account for the speciation of complexing ligands with pH and redox state. Click on SO42− unit pulldown and select speciate over x-y

  3. New plot reflects effect of SO42− speciation on Orpiment and Realgar stability fields. Blue line shows speciation of ligand SO42

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