Abstract
A new method for the solvent extraction-polarographic determination of cadmium has been proposed. The quaternary complex formed by the tris(2,2′-bipyridine)iron(II) cation and the tetraiodocadmate(II) anion can be readily extracted into benzyl alcohol. The extracted complex shows a well-defined reduction wave in the ternary electrolyte-solvent mixture, composed of benzyl alcohol, an aqueous electrolyte solution, and methyl cellosolve. The available range of the present method covers from 5.7×10−6 to 91.4×10−6 M of cadmium(II) in the aqueous phase. The optimum pH range for extraction is 3–9, and the extracted species is stable in the ternary solvent mixture for 5hr. Zinc (II), bromide, and chloride ions do not interfere, but copper (II), mercury (II), and iron(III) do interfere.
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