Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (10): 100302-100302.doi: 10.11889/j.0253-3219.2015.hjs.38.100302

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Measurement of total uranium in pure uranium sample by constant current coloumetry

TANG Lei FU Zhonghua LIU Xuemei LONG Kaiming   

  1. (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China)
  • Received:2015-07-07 Revised:2015-08-28 Online:2015-10-10 Published:2015-10-14

Abstract: Background: Constant current coulometry is one of the most precise methods in total uranium measurement, especially for pure uranium sample. Purpose: This study aims at the whole experimental flow conditions for total uranium measurement using constant current coloumetry. Methods: U3O8 and uranium standard solution were prepared. And various experimental conditions for phosphorus acid dosage, Fe(II) dosage, oxidizer dosage, oxidation temperature and coexisting ions etc., were reviewed while measuring total uranium of samples with different weights of standard uranium solutions added in. Results: With optimized flow, total uranium weights in different uranium standard solutions were measured. For 50 mg total uranium added in, the combined uncertainty was 0.12% by constant current coulometry. Conclusions: This method can be used to measure total uranium content in pure uranium sample, and phosphorus acid plays a key role. When the concentration of phosphoric acid is more than 10 mol?L?1, the reduction reaction can be conducted at room temperature.

Key words: Uranium, Constant current, Coulometry