A number of methods are reported in the literature for determining uranium titrimetrically by reducing hexavalent uranium to the tetravalent state and titrating the latter by means of standard oxidizing agents. Of these methods of reduction probably the most common is the use of a Jones reductor using amalgamated granular zinc as the packing material (3). Silver (1), lead (6) or cadmium (8, 9) packing for the reductor is also used. Other methods use aluminum (5, 2, 4) or copper (7) spirals. All these methods are reported as giving satisfactory results but certain difficulties are encountered in each of them. With the amalgamated zinc the uranium has a tendency to be reduced to the trivalent state and must then be oxidized to the tetravalent state by bubbling air through the solution for a few minutes. Aluminum tends to give over reduction also and, after all the metal has dissolved, the solution being hot, there is an appreciable amount of the tetravalent material oxidized unless air is excluded during cooling. The use of a copper spiral requires the exclusion of air and long periods of boiling. In the use of any reductor a transfer of solutions is involved with the concomitant chances for error.
Proceedings of the Iowa Academy of Science
©1948 Iowa Academy of Science, Inc.
McClure, John H. and Banks, Charles V.
"Use of a Zinc Spiral in the Titrimetric Determination of Uranium,"
Proceedings of the Iowa Academy of Science, 55(1), 263-265.
Available at: https://scholarworks.uni.edu/pias/vol55/iss1/35