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The extraction behavior of Mn", Fe", Co", Ni", Cu", Zn", Gai", and Cd" was studied with a new chelating extractant, 5-(4-nitrophenylazo)-7-(4-ethyl-l-methyloctyl)-8-quinolinol (HNEQ), in chloroform. HNEQ exhibits a much higher extractability for Co", Cu", Zn", and Cd" than 8-quinolinol. Especially, Cu" was quantitatively extracted with 0.001 mol dm-3 of HNEQ at such a low pH as 2.0 within 15 min, and was readily separated from the other metal(II, III) ions studied. From equilibrium studies, thedoi:10.2116/analsci.9.355 fatcat:6cyvcewllngv5dhpj25sbejb34