Abstract
Anodic stripping coulometry was developed for the determination of small amounts of nickel. In the range of 2·5 to 20 μg Ni/ml, the method is free of systematic error and produces well reproducible results. In the region of 100 per cent current yield, between +300 and 1040 mV (sce), the current flowing through the passive nickel electrode leads exlusively to the formation of bivalent ions in both perchloric and sulphuric acids. At higher potentials the share of the total cd by the nickel dissolution reaction falls to a very low value and a new reaction, eg oxygen evolution, sets in. In sulphuric acid a higher cd in the passive state is observed than in perchloric acid.
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