Inorganic polarography in organic solvents-I Some metal-pyridine-thiocyanate complexes in toluene

Results are reported for the direct application of polarography to the examination of organic phases following solvent extraction. Experimental factors such as suitable solvents, supporting electrolytes and electrode parameters have been studied and the method is tested for the extraction of the Cd, Co(II), Cu(II), Fe(II), Mn(II), Ni and Zn pyridine/thiocyanate complexes into toluene. The results show that the sensitivity is increased by the concentrating effect of the extraction system and better selectivity is achieved without searching for a suitable supporting electrolyte.