Radionuclides, heavy metals and fluorine incidence at Tapira phosphate rocks, Brazil, and their industrial (by) products

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dc.contributor.authorda Conceicao, F. T.
dc.contributor.authorBonotto, Daniel Marcos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionIGCE
dc.date.accessioned2014-05-20T15:21:43Z
dc.date.available2014-05-20T15:21:43Z
dc.date.issued2006-01-01
dc.description.abstractInorganic phosphate fertilizers may contain radionuclides, heavy metals and fluorine. This paper presents the possible environmental hazards from Tapira phosphate rocks and their (by) products (Brazil) utilized as phosphate fertilizers. The activity concentration of U-238, U-234, Ra-226 and K-40 in Tapira phosphate rocks is within the world range for these rock types. The Th-232 activity concentration is higher than the mean reported in phosphate rocks. A value of 2184 nGy h(-1) was obtained for the exposure dose rate in Tapira phosphate deposit area, which is indicative of a high background radiation area. The flotation-separation process causes the incorporation of no more than 9%, 11 % and 24% of radionuclides, heavy metals and fluorine, respectively, into the phosphate concentrate. The radionuclides and heavy metals existing in phosphate fertilizers applied in Brazilian crops according to the recommended rates, do not raise their concentration in soils to harmful levels. (C) 2005 Elsevier Ltd. All rights reserved.en
dc.description.affiliationUNESP, UDSI, Sorocaba, Ipero, Brazil
dc.description.affiliationIGCE, Rio Claro, Brazil
dc.description.affiliationUnespUNESP, UDSI, Sorocaba, Ipero, Brazil
dc.format.extent232-243
dc.identifierhttp://dx.doi.org/10.1016/j.envpol.2005.05.014
dc.identifier.citationEnvironmental Pollution. Oxford: Elsevier B.V., v. 139, n. 2, p. 232-243, 2006.
dc.identifier.doi10.1016/j.envpol.2005.05.014
dc.identifier.issn0269-7491
dc.identifier.lattes7430102726026121
dc.identifier.urihttp://hdl.handle.net/11449/32834
dc.identifier.wosWOS:000235701100005
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofEnvironmental Pollution
dc.relation.ispartofjcr4.358
dc.relation.ispartofsjr1,615
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectradionuclidespt
dc.subjectheavy metals and fluorinept
dc.subjectphosphate rockspt
dc.subjectphosphate fertilizerspt
dc.titleRadionuclides, heavy metals and fluorine incidence at Tapira phosphate rocks, Brazil, and their industrial (by) productsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes7430102726026121
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Petrologia e Metalogenia - IGCE