Other
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..989f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 5, pp.989-995
Other
1
Scientific paper
Experiments were carried out using rapid-quench hydrothermal techniques to determine the solubility of bunsenite (NiO) in supercritical H 2 O-NaCl-NiCl 2 solutions in the range 550 to 750°C, at 2 kbar. The solubility of NiO was enhanced by the formation of complexes of higher stoichiometry than NiCl 2 0 in the presence of increasing concentrations of aqueous NaCl. The results are consistent with the formation of the NiCl 3 - complex in the fluid over the entire temperature range, as a result of the reaction NiCl 2 0 ( aq ) + Cl - ( aq ) = NiCl 3 - ( aq ). The variation in values of the equilibrium constant for the above reaction is given by logK eq = 3.40(±0.83) - 2365 (±758)/ T (° K ). Despite the increase in solubility that results in the NaCl-bearing system, nickel should still remain a relatively immobile element, as compared to Ca, Mg, Fe and Mn, in supercritical aqueous Cl-bearing fluids, provided the activity of nickel in the coexisting solid mineral assemblage is not unusually high.
Fahlquist Lynne S.
Popp Robert K.
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