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- Article] Tantalum dissolution rate in simulant lung fluid
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DocNo of ILP: 4094
Doc. Type: Article
Title: Tantalum dissolution rate in simulant lung fluid
Authors: Lima, C; Coelho, MJ; Dalia, KCP; Leite, CVB; Medeiros, G; da Cunha, KD
Full Name of Authors: Lima, C.; Coelho, M. J.; Dalia, K. C. P.; Leite, C. V. Barros; Medeiros, G.; da Cunha, K. Dias
Keywords by Author: tantalum; solubility; dissolution rate; occupational exposure
Keywords Plus: IN-VITRO DISSOLUTION; INHALED PARTICLES; EXPERIMENTAL BRONCHOGRAPHY; REGIONAL DEPOSITION; RESPIRATORY TRACT; AEROSOL-PARTICLES; CLEARANCE; URANIUM; SOLUBILITY; EXPOSURE
Abstract: The aim of this study is to determine the solubility rate of tantalum contained in pyrochlore, columbite-tantalite and columbite in simulant lung fluid. The International Commission on Radiological Protection (ICRP), in its recommendation for limiting intakes of radionuclide by workers, has consistently recognized that the biological behavior of any specific material after incorporation can significantly diverge from model prevision. Model parameters should be adjusted to adapt the model for each specific substance material in order to estimate the dose due to this element intake. The most recent ICRP publication 66, respiratory tract dosimetry model, point out that information as data like particle size, aerosols solubility and the material chemical compounds are important parameters in the dose coefficients calculation. This paper studies the solubility in Simulant Lung Fluid (SLF) of Ta present in mineral dust particles. For this study 3 minerals were selected: pyrochlore, columbite-tantalite and columbite. Tantalum dissolution in vitro samples were obtained using the Gamble solution and PIXE (Particle Induced X-ray Emission) as analytical technique. In order to characterize the worker exposure to Ta bearing particles, one Brazilian niobium mine was selected. The mineral dust particles were collected using a six-stage cascade impactor and the elemental mass concentrations and the MMAD (Mass Median Aerodynamic Diameter) were determined. Concentrations of radionuclides from natural series of thorium and uranium were also determined. The results show that the workers are exposed to Ta bearing particles in the respirable fraction of aerosols (aerodynamic diameter (d (aer)) < 2.5 mu m) during the mineral processing to obtain Fe-Nb alloy. The solubility in Simulant Lung Fluid (SLF) of Ta present in mineral dust particles depends on the mineral characteristics. The solubility half-time varies between 34 and 62 h depending on the associated mineral.
Cate of OECD: Earth and related environmental sciences
Year of Publication: 2007
Business Area: gamble
Detail Business: gamble
Country: Netherlands
Study Area:
Name of Journal: WATER AIR AND SOIL POLLUTION
Language: English
Country of Authors: CNEN, Inst Radioprotec Dosimetria, BR-22780 Rio De Janeiro, Brazil; Inst Mil Engn, BR-22290 Rio De Janeiro, Brazil; Univ Fed Rio de Janeiro, BR-21941 Rio De Janeiro, Brazil; Pontificia Univ Catolica Rio de Janeiro, BR-22451 Rio De Janeiro, Brazil
Press Adress: da Cunha, KD (reprint author), CNEN, Inst Radioprotec Dosimetria, Av Salvador Allende s-n, BR-22780 Rio De Janeiro, Brazil.
Email Address: kenya@ird.gov.br
Citaion:
Funding:
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Number of Citaion: 34
Publication: SPRINGER
City of Publication: DORDRECHT
Address of Publication: VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN: 0049-6979
29-Character Source Abbreviation: WATER AIR SOIL POLL
ISO Source Abbreviation: Water Air Soil Pollut.
Volume: 186
Version: 41643
Start of File: 365
End of File: 371
DOI: 10.1007/s11270-007-9471-4
Number of Pages: 7
Web of Science Category: Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources
Subject Category: Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources
Document Delivery Number: 217ZY
Unique Article Identifier: WOS:000249987000031
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