Primary Coulometric Determination of Iron(II) and Arsenic(III)

Determination of Microgram Quantities of Fluoride and Cyanide by Measurement of Current from Spontaneous Electrolysis

“…In ordinary controlled potential electrolysis when 100% current efficiencies are obtained, a definite relation is to be expected between the instantaneous current and the bulk concentration of the limiting reactant (I). Calculations based on instantaneous current readings have been suggested as a substitute for the usual methods of current summation in controlled potential coulometric analysis (2). The present work demonstrates that instantaneous current readings in spontaneous electrolysis may, under certain conditions, be an equally suitable measure of the concentra tion of the limiting reactant in solution.…”

Coulometric Determination of Uranium(IV) by Oxidation at Controlled Potentials

“…The method of controlled-potential coulometric analysis has been applied to the oxidation of iron(II) (9), arsenic (III) (9,10), thallium(I) (3), and plutonium(III) (12) with 100% current efficiency at a platinum anode. With oxidations which involve reversible electrode couples, the potential of the working electrode determines the ratio of the amounts of oxidized and reduced forms that can exist in contact with the electrode, and current is forced to flow until such a ratio is reached.…”

“…The gravimetric determination of plutonium by ignition to the dioxide has been used to a limited extent in measurements of the specific activity of plutonium (1,6,9,11,19).…”

Coulometric titrations: A laboratory experiment

“…In the controlled potential method, the working electrode is kept at a fixed potential such that only the desired reaction can take place. The current decreases as the process proceeds, so that the total amount of current (coulombs) must be determined by means of an external coulometer (1,9,10,11) or by experimentally fitting a mathematical expression for the current-time relationship (13). The controlled potential method, though possibly more versatile than the constant current procedure, requires more time and involves the additional step for calculating the total number of coulombs.…”