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Determination of 35S in Radioisotope Wastes by a Wet Oxidation

[+] Author Affiliations
Heung N. Lee, Sang-Hoon Kang, Hong Joo Ahn, Kwang Yong Jee

Korea Atomic Energy Research Institute, Daejeon, South Korea

Wook Hyun Sohn

Korea Hydro & Nuclear Power, Daejeon, South Korea

Paper No. ICEM2007-7291, pp. 773-775; 3 pages
doi:10.1115/ICEM2007-7291
From:
  • The 11th International Conference on Environmental Remediation and Radioactive Waste Management
  • 11th International Conference on Environmental Remediation and Radioactive Waste Management, Parts A and B
  • Bruges, Belgium, September 2–6, 2007
  • Conference Sponsors: Nuclear Division and Environmental Engineering Division
  • ISBN: 978-0-7918-4339-0 | eISBN: 0-7918-3818-8
  • Copyright © 2007 by ASME

abstract

The oxidation studies of a sulfur to a sulfate ion by various oxyhalide oxidants in organic (thiourea, methionine) and inorganic (sulfate, thiophosphate) compounds were carried out in an acidic solution. The optimized result of the oxidation reaction was obtained when a bromate compound (BrO3 − ) as an oxidant and a 3 M HNO3 solvent. The chemical yield for the oxidation of the organic and inorganic sulfur compounds to a sulfate ion was monitored as 80% for thiophosphate, 87% for methionine, and 100% for thiourea and sulfate within 5% RSD. The oxidation of thiourea required at least 1.6 equivalents of the bromate in an acidic solution. In the case of the oxidation of methionine and thiophosphate, the oxidation yield was above 80% if the bromate was used at 20 times that of the substrates. The chemical yield in the paper sample (WypAll) exceeded 100% because of its background sulfur contents (910 ppm). The sulfate ion was quantitatively measured by using GPC and/or LSC counting of 35 S followed by precipitates of BaSO4 . The interfering nuclides (14 C, 32 P) were removed in an acidic condition. The minimum detectable activity (MDA) of 35 S was found to be 0.1 Bq/g.

Copyright © 2007 by ASME

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