Extraction of Selected Mono‐ to Tetravalent Metal Ions by 2,6‐Di‐(5,6‐Dialkyl‐1,2,4‐triazin‐3‐yl)Pyridines

The extraction of selected metals by 2,6‐di(5,6‐diethyl‐1,2,4‐triazin‐3‐yl)‐pyridine (DETP) and 2,6‐di(5,6‐dipropyl‐1,2,4‐triazin‐3‐yl)pyridine (DPTP) was studied. DPTP in 1‐butanol extracts Fe(II) chloride with high selectivity over Cu(II) chloride, while Cu(I) chloride is well extracted. DPTP in 4‐methyl‐2‐pentanone extracts In(III) and Ga(III) thiocyanates with a modest In(III)/Ga(III) separation factor, while In(III) nitrate is extracted very selectively over Ga(III) nitrate. DPTP in the same diluent extracts Nd(III) and Lu(III) thiocyanates with a moderate to good selectivity over Y(III). In extracting nitrates, DPTP in cyclohexanone and DETP in 1,1,2‐trichloroethane/4‐methyl‐2‐pentanone (3/2) discriminate unsatisfactorily between Nd(III) and Y(III). A good selectivity for Nd(III) over Y(III) is attained with DPTP in 1,1,2‐trichloroethane.