Anthropogenic source assessment of Ra-226 and Pb-210 in a sediment core from the Cubato River estuary (SE Brazil)

Autor(es)

Sanders, L. M. ^[1] ; Sanders, C. J. ^[2] ; Luiz-Silva, W. ^[3] ; Machado, W. ^[2] ; Silva-Filho, E. V. ^[2] ; Patchineelam, S. R. ^[2]

Afiliação do(s) autor(es)

^[1] IRD, BR-22780 Rio De Janeiro - Brazil

^[2] Univ Fed Fluminense, Dept Geoquim, Inst Quim, BR-24020007 Niteroi, RJ - Brazil

^[3] Univ Estadual Campinas, Inst Geociencias, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY; v. 287, n. 3, p. 729-732, MAR 2011.
• Citações Web of Science: 4

Resumo

A sediment core from an estuarine area receiving drainage from the highly industrialized Cubato River basin (SE Brazil) showed (226)Ra and (210)Pb activities up to 80 and 213 Bq kg(-1), respectively, which are greater than activities considered as regional background levels. Radionuclides and the elevated phosphorus concentrations (up to 0.3% sediment dry weight) found along the sediment core were significantly correlated with each other, indicating source similarity. These results indicate that (226)Ra and (210)Pb activities are affected by fertilizer industry-derived inputs in addition to natural sources. This interpretation was supported by (210)Pb/(226)Ra ratios (found to be between 2.6 and 3.9) that indicate disequilibrium between (226)Ra and its decay product (210)Pb, as expected for phosphogypsum-affected sediments. (AU)

• Processo FAPESP: 08/11511-8 - Fatores químicos e físicos como diagnóstico ambiental de estuário tropical impactado por elementos-traço: uma investigação holística (sedimento, água e biota) no sistema estuarino de Santos-Cubatão (SP)
• Beneficiário: Wanilson Luiz Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 04/00059-6 - Balanco geoquimico de elementos-traco e sua relacao com a mineralogia em sedimentos impactados do estuario de santos - cubatao (sp): riscos de biodisponibilidade de metais/metaloides e previsao de toxicidade.
• Beneficiário: Wanilson Luiz Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular