Validation of uranium and thorium determination in sediments by spectrophotometry with Arsenazo III

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dc.contributor.authorTEIXEIRA, L.F.L.
dc.contributor.authorMAZZILLI, B.P.
dc.contributor.authorNISTI, M.B.
dc.contributor.authorSAUEIA, C.H.R.
dc.coverageInternacionalpt_BR
dc.creator.evento60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORSpt_BR
dc.date.accessioned2018-03-20T16:52:32Z
dc.date.available2018-03-20T16:52:32Z
dc.date.eventoNovember 28 - December 01, 2017pt_BR
dc.description.abstractThe evaluation of environmental contamination is one of the most important ways to check the anthropogenic interference. Human activities next to a water body, as mining, or on the waterbody, such as transportation ships, can pour unwanted wastes, increasing the concentration of metals or radionuclides. One way to evaluate this contamination on waterbodies is the quantification of radionuclides on sediments. The evaluation of uranium and thorium contamination is an important measurement of anthropogenic interference, because these two natural radionuclides can be found in many places on earth. The are many techniques to determinate the uranium and thorium concentration in sediments samples, and the spectrophotometric method with Arsenazo III is one of the quicker and cheaper method. The Arsenazo-III reacts with both radionuclides, producing a stable complex in low pH condition. The radionuclides were extracted from the sediments samples by an acid digestion, with HNO3, HF and H2O2, on a microwave. The interferences were removed by solvent extraction process, allowing the Arsenazo III react only with the uranium and thorium. The validation process was performed to evaluate if the whole process could reach reliable results with expected quality level. The Limit of Detection (LOD), Limit of Quantification (LOQ), Accuracy (Z-Score) and Precision (Relative Standard Deviation) of each method were evaluated following the INMETRO’s guidance document. The LOD and LOQ of the uranium determination are, respectively, 0.98 and 1.11 ppm, and for thorium determination are, 0.61 and 0.81 ppm, for the analysis of 0.5g of sediments samples. The methods validations were performed using the certified reference material (CRM) IAEA SL-1, for uranium determination, and IAEA SL-3, for thorium determination. Both validations reached satisfactory results of Accuracy and Precision for the analysis of 0.5g of sediments samples.pt_BR
dc.format.extent84-84pt_BR
dc.identifier.citationTEIXEIRA, L.F.L.; MAZZILLI, B.P.; NISTI, M.B.; SAUEIA, C.H.R. Validation of uranium and thorium determination in sediments by spectrophotometry with Arsenazo III. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. <b>Abstract...</b> São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 84-84. Disponível em: http://repositorio.ipen.br/handle/123456789/28784.
dc.identifier.orcidhttps://orcid.org/0000-0001-7174-9703
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/28784
dc.localSão Paulo, SPpt_BR
dc.local.eventoSão Paulo, SPpt_BR
dc.publisherInstituto de Pesquisas Energéticas e Nuclearespt_BR
dc.rightsopenAccesspt_BR
dc.titleValidation of uranium and thorium determination in sediments by spectrophotometry with Arsenazo IIIpt_BR
dc.typeResumo de eventos científicospt_BR
dspace.entity.typePublication
ipen.autorCATIA HELOISA ROSIGNOLI SAUEIA
ipen.autorMARCELO BESSA NISTI
ipen.autorBARBARA PACI MAZZILLI
ipen.autorLUIZ FLAVIO LOPES TEIXEIRA
ipen.codigoautor1986
ipen.codigoautor639
ipen.codigoautor45
ipen.codigoautor9675
ipen.contributor.ipenauthorCATIA HELOISA ROSIGNOLI SAUEIA
ipen.contributor.ipenauthorMARCELO BESSA NISTI
ipen.contributor.ipenauthorBARBARA PACI MAZZILLI
ipen.contributor.ipenauthorLUIZ FLAVIO LOPES TEIXEIRA
ipen.date.recebimento18-03pt_BR
ipen.event.datapadronizada2017pt_BR
ipen.identifier.ipendoc24606pt_BR
ipen.notas.internasAbstractpt_BR
ipen.type.genreResumo
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relation.isAuthorOfPublicationb935386b-b487-4939-a875-79c100ea555f
relation.isAuthorOfPublication7e8b6143-512f-4b43-87a9-eb5ea497807f
relation.isAuthorOfPublicationb3500cab-7caa-4ff9-8e26-f854b79e31f5
relation.isAuthorOfPublication.latestForDiscoveryb3500cab-7caa-4ff9-8e26-f854b79e31f5
sigepi.autor.atividadeTEIXEIRA, L.F.L.:9675:340:Spt_BR
sigepi.autor.atividadeMAZZILLI, B.P.:45:340:Npt_BR
sigepi.autor.atividadeNISTI, M.B.:639:340:Npt_BR
sigepi.autor.atividadeSAUEIA, C.H.R.:1986:340:Npt_BR
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