Separation of Gold(III) as Its Ion-pair Complex with 18-Crown-6 from Hydrochloric Acid Media by Means of Solvent Extraction.

概要

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A new solvent extraction technique for the separation of gold(III) at trace amounts from hydrochloric acidmedia was developed based on the formation of an ion-association complex of tetrachloro gold anion,AuCl4- with 18-crown-6 (18C6) oxonium cation in 1,2-dichloroethane. The effect of various factors (crownether, acid concentration, solvent, shaking time, stripping reagent etc.) on the extraction and separation ofgold(III) was investigated. Quantitative extraction was achieved using 0.05 mol dm-3 18C6 in1,2-dichloroethane at 4 mol dm-3 HCl within 5 min. Back-extraction was carried out by 5-min shaking with0.1 mol dm-3 Na2S2O3 in 0.2 mol dm-3 NH3, followed by FAAS determination. Interference studies revealedexcellent tolerance of the method to foreign ions. The method's high selectivity was demonstrated by aspike recovery of >96% for gold(III) and by the negligible extraction of silver(I). Using first-class silverreagents, the quantitative recovery of traces of gold(III) was achieved up to a 20-fold preconcentrationfactor.
Japan Society for Analytical Chemistry = 日本分析化学会の論文
2001-00-00