Further developments in the high-precision coulometric titration of uranium.
An experimental study of the current efficiency in the coulometric generation of Ti(III), as a function of electrolyte composition, current density and electrode material, has been performed. The cathodes investigated include platinum, mercury and graphite. The first two are suitable for high-precision determination of uranium. The graphite surface is readily poisoned, rendering it useless for high-accuracy work. The use of mercury requires thorough removal of chloride from the system. The precision and error obtained are comparable for both the mercury and platinum cathodes, and are of the order of 50 ppm.
Tanaka
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Center for Analytical Chemistry, National Bureau of Standards, Washington, D.C. 20234, U.S.A.
Marinenko
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Koch
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