COMPLEXATION OF CU2+ IN OXIDIZED NACL BRINES FROM 25°C TO 175°C: RESULTS FROM IN SITU EXAFS SPECTROSCOPY

dc.contributor.author	Collings M.D.
dc.contributor.author	Sherman D.M.
dc.contributor.author	Ragnarsdottir K.V.
dc.date.accessioned	2021-01-23T00:50:11Z
dc.date.available	2021-01-23T00:50:11Z
dc.date.issued	2000
dc.identifier	https://elibrary.ru/item.asp?id=242810
dc.identifier.citation	Chemical Geology, 2000, 167, 1, 65-73
dc.identifier.issn	0009-2541
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/23540
dc.description.abstract	In order to understand the significance of Cu2+ transport in oxidized brines and in secondary enrichment processes, we studied the speciation of 0.1 M CuCl2 in 0, 2, and 5 M NaCl solutions from 25°C to 175°C using in situ EXAFS spectroscopy. No chloro-copper complexation is observed in solutions containing 0.2 and 2.2 M Cl at temperatures up to 75°C. Between 125°C and 175°C, the dominant species are CuCl+ and CuCl20. At very high Cl concentrations (5 M NaCl), CuCl+ is the dominant species at 25°C and 75°C, becoming CuCl3- and CuCl42- at 125°C. However, between 125°C and 175°C, there is a transition to only CuCl+ and CuCl20. This may result from the competitive ion-association of Na+ and Cl-. CuCl42- may be an important species in fluids associated with the formation of red-bed copper deposits.
dc.subject	COPPER
dc.subject	AQUEOUS SPECIATION
dc.subject	EXAFS
dc.subject	HIGH TEMPERATURE
dc.subject	CHLORIDE
dc.title	COMPLEXATION OF CU2+ IN OXIDIZED NACL BRINES FROM 25°C TO 175°C: RESULTS FROM IN SITU EXAFS SPECTROSCOPY
dc.type	Статья

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