Abstract: The mechanism of extraction of silver(I) from thiosulphate solution by N₁₉₂₃ nitrate has been Studied. The effects of acidity, concentration of NO₃^- and S₂O₃^2- in aqueous phase on the diStribution ratio (D) of Ag(I) have been investigated. It is found that the D value decreases with increase of concentration of NO₃^- and S₂O₃^2-, and pH value as well. The results show that the extraction process is an anion exchange and the extracted species are a mixture of AgS₂O₃^- and Ag(S₂O₃)₂^3-. The IR spectra of the extracted complexes were measured, which support the mechanism proposed.

Key words: Extraction, Silver ion, Primary amine N₁₉₂₃, Thiosulphate, Mechanism