Determination of Uranium Traces in Nuclear Reactor IEA-R1 Pool Water
- 1 Nuclear and Energy Research Institute—IPEN/CNEN-SP, São Paulo, Brazil
- 2 Nuclear and Energy Research Institute—IPEN/CNEN-SP, São Paulo, Brazil
- 3 Nuclear and Energy Research Institute—IPEN/CNEN-SP, São Paulo, Brazil
- 4 Chemical Engineering Department, Santa Catarina Federal University, Florianópolis, Brazil
- 5 Nuclear and Energy Research Institute—IPEN/CNEN-SP, São Paulo, Brazil
Abstract
IEA-R1 nuclear reactor operation has the routine to control uranium content in pool water to be in trace range below 50 μ g/L. There are several routes to determine the uranium trace content in water in the literature; voltammetry has been systematically employed. In the present study, the chosen chemical determination of uranium traces used the voltammetric method known as AdCSV (adsorptive cathodic stripping voltammetry). This technique, based on mercury voltammetry, is an adequate methodology to determine uranium traces. The chloranilic acid [CAA] (2,5-dichloro-3,6-dihydroxy-1,4-benzo-quinone) is indicated as chelating agent. The redox reaction of U<span style="font-family: Euclid Math Two">O</span><sup>2+</sup><sub style="margin-left:-6px;">2</sub> with CAA is sensitive in the range of 2 < pH < 3. But pH variation imposes changing on [UO 2 (CAA) 2 ] reduction potential. In this work, we present the uranium trace results for IEA-R1 reactor water, sampled after an operation routine shutdown. The uranium trace determination for IEA-R1 pool water showed content around 1 μ g/L [U] with statistical significance. Therefore the IEA-R1-reactor-water purification showed to be adequate and safe.
- Keith, L.S., Faroon, O.M. and Fowler, B.A. (2007) Handbook on the Toxicology of Metals. In: Nordberg, G.F., Fowler, B.A., Nordberg, M. and Friberg, L., Eds., 3rd Edition, Academica Press, Burlington, USA.
- Saliba-Silva, A.M., Garcia, R.H.L., Martins, I.C., Urano Carvalho, E.F., Durazzo, M., et al. (2011) Uranium Briquettes for Irradiation Target. International Nuclear Atlantic Conference, INAC, Belo Horizonte, MG, Brazil, 24-28 October 2011. https://www.ipen.br/biblioteca/2011/inac/16991
- Khadro, B. and Jaffrezic-Renault, N. (2010) A Miniaturized System for Ultratrace Uranium Analysis in Waters. Procedia Engineering, 5, 1212-1215. https://doi.org/10.1016/j.proeng.2010.09.330
- Sander, S., Wagner, W. and Henze, G. (1995) Direct Determination of Uranium Traces by Adsorptive Stripping Voltammetry. Analytica Chimica Acta, 305, 154-158. https://doi.org/10.1016/0003-2670(94)00481-Z
- Zavodska, L., Kosorinova, E., Scerbakova, L. and Lesny, J. (2008) Environmental Chemistry of Uranium. Hungarian Electronic Journal of Sciences, No ENV-081221-A, 1-19. http://heja.szif.hu/ENV/ENV-081221-A/env081221a.pdf
- Monticelli, D., Ciceri, E. and Dossi, C. (2007) Optimization and Validation of an Automated Voltammetric Stripping Technique for Ultratrace Metal Analysis. Analytica Chimica Acta, 594, 192-198. https://doi.org/10.1016/j.aca.2007.05.031
- Dossi, C., Carugati, G., Credaro, A., Gambillara, R., Martin, S., et al. (2007) Release and Speciation of Uranium in Low-Ionic-Strength Groundwaters at an Abandoned Uranium Mine in Val Vedello (Orobic Alp—Italy) by Adsorptive Cathodic Stripping Voltammetry. International Journal of Environmental Analytical Chemistry, 87, 361-373. https://doi.org/10.1080/03067310601151845
- Mostafa, S.I. (1999) Complexes of 2,5-Dihydroxy-1,4-Benzoquinome and Chloranic Acid with Second and Third Row Transition Elements. Transition Metal Chemistry, 24, 306-310. https://doi.org/10.1023/A:1006944124791
- Mlakar, M. and Branica, M. (1994) Applicability of Synergistic Adsorption in Electroanalysis of Dissolved Uranium in Seawater. Marine Chemistry, 46, 61-66. https://doi.org/10.1016/0304-4203(94)90045-0
- Mazzocchin, G.A. and Daniele, S. (1990) Determination of Trace Amounts of Thorium by Electroanalytical Techniques. Talanta, 37, 317-324. https://doi.org/10.1016/0039-9140(90)80060-S
- Mlakar, M. and Branica, M. (1989) Stripping Voltammetric Determination of Trace Levels of Uranium by Synergic Adsorption. Analytica Chimica Acta, 221, 279-287.