Open AccessDETERMINATION OF TETRAVALENT URANIUM IN THORIUM OXIDE-URANIUM OXIDE MIXTURES. PARTS I, II, AND III
Author(s) -
Oscar Menis
Publication year - 1959
Language(s) - English
Resource type - Reports
DOI - 10.2172/4117883
Subject(s) - uranium , thorium , potassium dichromate , uranium oxide , dissolution , oxide , chemistry , titration , inorganic chemistry , radiochemistry , nuclear chemistry , materials science , metallurgy , organic chemistry
For the determination of milligram quantities of uranium(N) in thorium oxide-uranium oxide mixtures which may also contain uranium(VI), it was necessary to devise a means of dissolving the sample so as to prevent any air oxidation of the uranium(IV) to uranium(VI). For this determination, the conventional potassium dichromate volumetric method was used except that the sample was dissolved under reflux in 7 M H/sub 3/PO/sub 4/ which contained an excess of standard dichromate solution. Following the dissolution of the sample, this excess was determined by back titration with a standard solution of iron(II). Barium diphenylaminesulfonate was used as the indicator. Initial tests on the dissolution of samples of thorium oxide-uranium oxide in hot HC1O/sub 4/ and hot HCI are described. (auth