Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Insight the Liquid-Liquid Extraction System AuCl4-/HCl/A327H+Cl- Ionic Liquid/Toluene

Version 1 : Received: 2 March 2021 / Approved: 2 March 2021 / Online: 2 March 2021 (22:35:23 CET)

A peer-reviewed article of this Preprint also exists.

Alguacil, F.J.; Lopez, F.A. Insight into the Liquid–Liquid Extraction System AuCl4/HCl/A327H+Cl Ionic Liquid/Toluene. Processes 2021, 9, 608. Alguacil, F.J.; Lopez, F.A. Insight into the Liquid–Liquid Extraction System AuCl4−/HCl/A327H+Cl− Ionic Liquid/Toluene. Processes 2021, 9, 608.


The ionic liquid A327H+Cl- is generated by reaction of the tertiary amine A327 (industrial mixture of tri-octil and tri-decyl amines) and hydrochloric acid solutions. Further, the extraction of Au(III) by A327H+Cl- ionic liquid under various variables, including metal and ionic liquid concentrations, has been investigated. Results indicate that A327H+AuCl4- is formed, by an exothermic (ΔHº= -3 kJ/mol) reaction, in the organic solution. Aqueous ionic strength influences the formation constants values and the specific interaction theory (SIT) is used to estimate the interaction coefficient between AuCl4- and H+. Gold (III) is stripped using thiocyanate media, and from the strip solutions, gold is precipitated as gold nanoparticles.


gold(III); A327H+Cl-; liquid-liquid extraction; ionic liquids; nanoparticles


Chemistry and Materials Science, Analytical Chemistry

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