Preconcentration and analysis of gold from cyanide solutions with the use of a microcolumn packed with the phosphine oxide Cyanex 921

Abstract

The phosphine oxide Cyanex 921 (tri-n-octylphosphine oxide) was found to be a very efficient extradant for gold from aurocyanide aqueous solutions. A system comprising a microcolumn packed with this new reagent was developed for the separation and enrichment of gold. Because of the high selectivity of the developed system it is possible to analyze gold in the presence of an excess of other metals and/or in high ionic strengh solutions.

How TOPO affects the interface of the novel mixed water/AOT:TOPO/n-heptane reverse micelles: dynamic light scattering and Fourier transform infrared spectroscopy studies

“…[40][41][42] To verify the best conditions with regard to the formation of complexes, extraction and recovery metals, many studies have been performed to date. [43][44][45][46][47][48][49] Furthermore, numerous studies have reported the use of this compound as an alternative for the synthesis of nanoparticles, controlling and inhibiting their growth morphology. [50][51][52] Moreover, its use is widely known in preparing quantum dots of InP, CdSe and ZnO in a range of organic solvents.…”

A study of the interaction between dialkyldimethylammonium bromides and tri-n-octylphosphine oxide (topo) in mixed monolayers at the air/water interface

“…Moreover, TOPO is used as a co-chelator or a synergistic agent, which protects the chelate from external interaction by filling the unoccupied slots in the metal-ion coordination sphere [4,5]. To verify the best conditions for complex formation, extraction, and recovery of metals, many studies have been performed so far [3,[6][7][8][9][10][11][12].…”

Synthesis of polyimide from 5,5″-bis(bromomethyl)-2,2′:6′,2″-terpyridine and investigation of the polymer sorption behavior towards some metal ions

“…Though ion-exchange resins and solid-supported extractants, usually based on PS-DVB or certain methacrylates are cheap "working horses" [15][16][17][18][19][20][21][22][23][24][25], they sometimes suffer from insufficient selectivity or require special conditions such as pH or ionic strength of the solution, which are hard to realize starting from standard metal ion containing aqua regia solutions. A variety of different sorbents for the selective extraction of other metal ions such as lanthanides prepared by various metathesis polymerization-based techniques has already been described [26][27][28][29][30][31][32][33][34][35][36].…”