PRECONCENTRATION OF CADMIUM, COBALT, COPPER, NICKEL AND ZINC BY SOLVENT-EXTRACTION INTO METHYL ISOBUTYL KETONE WITH 1,5-BIS [1-(2-PYRIDYL) ETHYLIDENE] THIOCARBONOHYDRAZIDE AND 1,5-BIS [PHENYL-(2-PYRIDYL) METHYLENE] THIOCARBONOHYDRAZIDE
Mts. Cordero et al., PRECONCENTRATION OF CADMIUM, COBALT, COPPER, NICKEL AND ZINC BY SOLVENT-EXTRACTION INTO METHYL ISOBUTYL KETONE WITH 1,5-BIS [1-(2-PYRIDYL) ETHYLIDENE] THIOCARBONOHYDRAZIDE AND 1,5-BIS [PHENYL-(2-PYRIDYL) METHYLENE] THIOCARBONOHYDRAZIDE, Talanta, 40(5), 1993, pp. 691-695
The synthesis, physicochemical properties and interactions of two new
thiocarbohydrazones, namely 1,5-bis[l-(2-pyridyl) ethylidene] thiocarb
onohydrazide (APTH) and 1,5-bis[phenyl-(2-pyridyl) methylene] thiocarb
onohydrazide (BPTH) have been studied as well as the use of both compo
unds as extracting reagents. These thiocarbohydrazones form yellow com
plexes with bivalent metal ions, and these are extractable into methyl
isobutyl ketone. Conditions for quantitative extraction of Cd(II), Co
(II), Cu(II), Ni(II) and Zn(II) are established from a critical study
of the effect of pH, shaking time, reagent concentration in the organi
c phase, ionic strength and volume ratio of aqueous to organic phase.