As (III) and Sb(III) sulfide complexes: An evaluation of stoichiometry and stability from existing experimental data

Details As (III) and Sb(III) sulfide complexes: An evaluation of stoichiometry and stability from existing experimental data As (III) and Sb(III) sulfide complexes: An evaluation of stoichiometry and stability from existing experimental data

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2185s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 9, pp.2185-2194

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Published experimental data on the solubility of Sb 2 S 3 and As 2 S 3 in sulfide solutions are used to determine the stoichiometry and stability constants of antimony and arsenic sulfide complexes at temperatures from 25 to 300°C. Least square fits and multicomponent equilibrium computations on selected solubility data indicate that the most probable stoichiometries of antimony and arsenic sulfide complexes are H 2 Sb 2 S 4 , HSb 2 S - 4 and Sb 2 S 2 4 - , and H 3 As 3 S 6 , H 2 As 3 S 6 - and HAs 3 S 2 6 - . Stability constants evaluated for these complexes indicate that all three arsenic species, but only HSb 2 S - 4 , are stable within the pH range of typical geochemical systems. The determination of stability constants for the above species results from a critical evaluation of available experimental data. Many experimental studies are inconsistent with each other or, by themselves, lack sufficient quantitative information. However, when used together, the data from a few carefully selected studies yield coherent results. Newly derived stability constants for antimony hydroxide and arsenious acid indicate that, at the sulfide concentrations considered here, these species are generally unimportant relative to sulfide complexes, although they become the dominant arsenic and antimony species at high temperatures in most geothermal systems.

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