The behaviour of arsenic during the precipitation of alkali jarosite compounds at 97°C has been investigated as a function of the arsenic and alkali concentrations, solution pH and dissolved iron concentration. Arsenite is not precipitated, but arsenate phases are extensively eliminated with the jarosites formed from either sulphate or chloride media. Up to 90% of the initial arsenate can be precipitated, mostly as a separate phase but also as a limited solid solution in the jarosite. Although well crystallized scorodite is formed in chloride media, an amorphous phase, chemically similar to scorodite, usually precipitates in sulphate media at this temperature. The results obtained at 97°C suggest a limited solid solubility of AsO4 (∼2%) in the alkali jarosites, but this point requires confirmation.
No takes yet. Share an insight, caveat, or question.
Dutrizac et al. (1987) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: