Coulometric titration by means of a controlled-potential-pulsed-current potentiometric technique-I Metal ions by electro-deposition.
A new method for electrochemical titrations is proposed, based on the redox transformation of the test species by means of a controlled-potential pulsed current, followed by measurement of the potential in the intervals between the current pulses: the end-point is found by means of Sörensen's linearization technique. Investigations on various metal ions (Ag(+), Cu(2+), Cd(2+), Pb(2+)) have shown that the accuracy and sensitivity, which depend on the nature of the species titrated, are comparable with those of other titration techniques. The method permits analytical separations and determinations of metal ions in mixtures. No particularly elaborate instrumentation is required and the apparatus described is simple to use, reliable and inexpensive.
Andronidis
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Istituto Chimico G. Ciamician dell'Università, Scuola di Specializzazione in Chimica Analitica, via Selmi 2, 40126 Bologna, Italy.
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Pagura
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Valcher
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