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An Experimental Study of Copper(I)-Chloride and Copper(I)-Acetate Complexing in Hydrothermal Solutions between 50oC and 250oC and Vapor-Saturated Pressure

Liu, WeiHua; McPhail, Derry; Brugger, Joel

Description

The transport of copper is affected by complexing with ligands such as chloride, bisulphide and acetate. Many copper deposits are formed from hydrothermal waters and brines and in order to understand their formation we need thermodynamic properties of aqueous copper species. The solubility of cuprite experiments in pH-buffered acetate and chloride solutions was determined at 50°C, 150°C and 250°C and water vapor saturated pressures. Chloride and acetate concentrations were varied using NaCl...[Show more]

dc.contributor.authorLiu, WeiHua
dc.contributor.authorMcPhail, Derry
dc.contributor.authorBrugger, Joel
dc.date.accessioned2015-12-07T22:19:37Z
dc.identifier.issn1872-9533
dc.identifier.urihttp://hdl.handle.net/1885/19430
dc.description.abstractThe transport of copper is affected by complexing with ligands such as chloride, bisulphide and acetate. Many copper deposits are formed from hydrothermal waters and brines and in order to understand their formation we need thermodynamic properties of aqueous copper species. The solubility of cuprite experiments in pH-buffered acetate and chloride solutions was determined at 50°C, 150°C and 250°C and water vapor saturated pressures. Chloride and acetate concentrations were varied using NaCl (0.001 m to 2 m) and NaAc (0.1 m to 2 m, where Ac refers to acetate). Measured copper concentrations varied between 0.0001 m and 0.2 m and show systematic increases with increasing temperature and acetate or chloride concentration. Logarithms of the formation constants (log K) of copper complexes were fitted by a simplex function minimization method, then speciation models and uncertainties of fitted log K values were examined by residual maps and speciation plots of experimental solutions. Interpretation of our experimental data shows that CuCl(aq), CuCl2-, CuAc(aq) and CuAc2- were present in our experiments at all temperatures. CuCl32- is an important complex at 50°C, but cannot be detected unequivocally at 150°C and 250°C. This study presents the first experimentally-derived log K values for copper(I) acetate complexes (CuAc(aq) and CuAc2-). The derived log K values of copper(I) chloride complexes (CuCl(aq) and CuCl-2) are similar to recently published experimentally derived values (Xiao et al., 1998). Based on new log K values generated from this study, our calculations indicate that copper transport as acetate complexes is important in acetate-bearing fluids lacking competition of other ligands such as Cl- and HS-.
dc.publisherPergamon-Elsevier Ltd
dc.sourceGeochimica et Cosmochimica Acta
dc.subjectKeywords: complexation; copper; hydrogeochemistry; hydrothermal fluid; ore deposit; thermodynamics
dc.titleAn Experimental Study of Copper(I)-Chloride and Copper(I)-Acetate Complexing in Hydrothermal Solutions between 50oC and 250oC and Vapor-Saturated Pressure
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume65
dc.date.issued2001
local.identifier.absfor040299 - Geochemistry not elsewhere classified
local.identifier.ariespublicationu4167262xPUB8
local.type.statusPublished Version
local.contributor.affiliationLiu, WeiHua, Monash University
local.contributor.affiliationMcPhail, Derry, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBrugger, Joel, Monash University
local.description.embargo2037-12-31
local.bibliographicCitation.issue17
local.bibliographicCitation.startpage2937
local.bibliographicCitation.lastpage2948
local.identifier.doi10.1016/S0016-7037(01)00631-7
dc.date.updated2015-12-07T08:38:37Z
local.identifier.scopusID2-s2.0-0034817445
CollectionsANU Research Publications

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