Effect of Hydrophobic Substituent on Solvent Extraction of Copper(II) with 5-Alkyloxymethyl-8-quinolinol or 5-Dialkylaminomethyl-8-quinolinol and Separation of Copper(II)

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Abstract
The extraction of metal ions (Cu(II), Co(II), Ni(II), Zn(II), Pb(II), Fe(III)) with hydrophobic 5-dioctylaminomethyl-8-quinolinol (HN8Q) and 5-octyloxymethyl-8-quinolinol (HO8Q), which were newly synthesized, was investigated. Copper(II) was completely extracted with 0.01mol dm-3 HN8Q or HO8Q into chloroform even at pH 1.9, while cobalt(II), nickel(II), lead(II), and zinc(II) were not extracted at all under the same conditions. The extraction rate for copper(II) with these extractants was large, whereas the rates for other metal ions were remarkably small at the same pH region. The complete separation of copper(II) from iron(III) was acieved by adjustng pH to 1.9 for the extraction and subsequently stripping copper(II) from copper(II)-HO8Q in chloroform with 0.5mol dm-3 nitric acid solution. The extraction-pH curves for copper(II) shifted to a lower pH region with increasing the number of carbon atoms of alkyloxymethyl or dialkylamino groups.