ウランを含む硝酸溶液中の遊離酸およびウランの定量

概要

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The titration apparatus which had been described in the previous report was improved, by use of which was investigated a rapid method for alkalimetric titration of nitric acid solution containing uranium. (1) In order to facilitate the detection of an equivalence point of titration, a microammeter was replaced by an autobalancing recorder, on which a differential titration curve as well as the volume of titrant delivered were recorded. (2) In a direct titration of a nitric acid solution containing uranium alone, one of the equivalence points on the differential titration curve corresponded to free nitric acid. In a titration of the same solution after precipitation of uranium by addition of hydrogen peroxide, the equivalence point corresponded to the sum of the free and the uranium-bound nitric acid. Uranium could then be determined from the difference of the two titres. (3) In a titration of a nitric acid solution containing uranium together with aluminum, both the free acid and uranium could be determined as above by an addition of ammonium oxalate. (4) The titration was carried out with a relative error of less than 3% within a couple of minutes.
社団法人日本分析化学会の論文