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Start Over Author "Orlando Bravo" Journal analytica chimica acta
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1. Extraction of tetrabutylammonium tetrachloroaurate(III)into chloroform solution of tetrabutylammonium perchlorate and spectrophotometric determination

Author

Reynold T. Iwamoto and Orlando Bravo

Subjects
Chloroform, Aqueous solution, Tetrabutylammonium perchlorate, Apparent Equilibrium Constant, Inorganic chemistry, Extraction (chemistry), Biochemistry, Chloride, Analytical Chemistry, chemistry.chemical_compound, chemistry, medicine, Environmental Chemistry, Constant (mathematics), Spectroscopy, Equilibrium constant, medicine.drug
Abstract

The distribution equilibrium: AuCl4-+(Bu4N+, ClO4-)HCCl3 ⇌ (Bu4N+, AuCl4-)HCCl3+C1O4-, has been examined. With acidic aqueous chloride solutions in which -log ([H+] [Cl-]) 1 2 is greater than 2, the apparent equilibrium constant, KA, is a constant equal to the equilibrium constant of the distribution reaction above; a value of 2.88·103 was obtained. Combination of the extraction with a direct spectrophotometric determination of AuCl4- in chloroform at 312 nm provides a simple, rapid, and accurate analytical method for the separation and determining of gold in the μg-range.

Published
1969
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