Supporting Electrolytes in Polarographic Analysis


BUFFER solutions containing ammonia and an ammonium salt have been widely used as supporting electrolytes in polarographic analysis. Tyler and Dean1 found that the total ionic concentration of such a solution might be increased without greatly affecting the reduction steps of copper and zinc, so that slight variations of concentration were less important than in other supporting electrolytes. Lingane2 reported that the diffusion current constants of copper, cadmium and zinc in ammoniacal solutions were higher than those found in decinormal potassium chloride. From his data, it may be calculated that the mobilities of the complex amminocations in ammoniacal solution are considerably greater than those of the aquo-ions, and correspond to an apparent ionic radius less than 3 A.

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  1. 1

    Tyler and Dean, Ind. Eng. Chem. Anal. Ed., 15, 520 (1943).

  2. 2

    Lingane, Ind. Eng. Chem. Anal. Ed., 15, 583 (1943).

  3. 3

    Wille, Z. phys. Chem., A, 171, 93 (1943).

  4. 4

    Fajans and Johnson, J. Amer. Chem. Soc., 64, 668 (1943).

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RICHES, J. Supporting Electrolytes in Polarographic Analysis. Nature 157, 479 (1946).

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