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Updated: Jun 28, 2026

Synthesis and Characterization of Amphiphilic Gold Nanoparticles
Published on: July 2, 2019
Extraction with long-chain amines-IV Separation and colorimetric determination of gold
1Analytical Laboratory, Institute of Geological Sciences, Charles University, Prague 2, Albertov 6, Czechoslovakia.
Abstract:
A highly selective method, almost free from interferences, for extraction of gold(III) from sulphuric acid into a chloroform solution of trioctylamine (TOA) is described. The yellow extract is then measured at 325-330 nm. Gold can be determined in the presence of platinum. The method has been applied to the determination of gold in waste dumps. A more sensitive method is based on reaction of the gold with diphenylcarbazide after the separation of the gold from the TOA-chloroform extract. The violet colour is stable and is measured at 560 nm.
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