1992 Volume 8 Issue 4 Pages 517-520
2-Hydroxy-alkylsubstituted azorenes were synthesized to examine the extraction behavior of silver(I), mercury(II), copper(II), nickel(II), cobalt(II) and iron(III) from 0.1mol/dm3 of aqueous ammonium nitrate solution. The distribution ratio of these metals was determined as a function of pH. The order of selectivity is the following:Fe(III)>Ag(I)>Cu(II)>Ni(II)>Co(II). Mercury(II) was not extracted with the present extractants. A quantitative study on the extraction of copper(II) was carried out to elucidate the extraction stoichiometry and extraction equilibrium constant by examining the concentration effects of hydrogen ion, extractant and ammonium nitrate on the distribution ratio of copper ion. Copper(II) was found to be extracted according to the following chelating formation reaction: Cu2++2HR_??_CuR2+2H+; Kcu. The equilibrium constant of this reaction was evaluated as Kcu=1.6×10-8.
