Dissolution Factors of Ta, Th, and U Oxides Present in Pyrochlore

Air pollution can be a problem in industrial processes, but monitoring and controling the aerosols in the work place is not enough to estimate the occupational risk due to dust particle inhalation. The solubility in lung fluid is considered to estimate this risk. The aim of this study is to determin...

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Bibliographic Details
Published in:	Water, air, and soil pollution Vol. 205; no. 1-4; pp. 251 - 257
Main Authors:	Dias da Cunha, K, Santos, M, Zouain, F, Carneiro, L, Pitassi, G, Lima, C, Barros Leite, C. V, Dália, K. C. P
Format:	Journal Article
Language:	English
Published:	Dordrecht Dordrecht : Springer Netherlands 01-01-2010 Springer Netherlands Springer Springer Nature B.V
Subjects:	Aerosols Air pollution Aircraft Animal, plant and microbial ecology Applied ecology Atmospheric Protection/Air Quality Control/Air Pollution Biological and medical sciences Biological effects of radiation Chemical behavior Chemical elements Climate Change/Climate Change Impacts Crystal lattices Dissolution Dust Earth and Environmental Science Ecotoxicology, biological effects of pollution Environment Environmental monitoring Fundamental and applied biological sciences. Psychology General aspects Human exposure Hydrogeology Inhalation Lungs Mathematical models Metals Mineral solubility Mines Niobium Occupational exposure Outdoor air quality Oxides Production processes Radio communications Radiocontamination Soil Science & Conservation Spectrometry Studies Tantalum Thorium Tissues, organs and organisms biophysics Toxicity Uranium Uranium oxide Water Quality/Water Pollution Pyrochlore Tantalum Uranium Solubility Thorium Trace element Pollutant Radioactive pollution Oxides Radioisotope Dissolution Heavy metal
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Summary:	Air pollution can be a problem in industrial processes, but monitoring and controling the aerosols in the work place is not enough to estimate the occupational risk due to dust particle inhalation. The solubility in lung fluid is considered to estimate this risk. The aim of this study is to determine in vitro specific dissolution parameters for thorium (Th), uranium (U), and tantalum (Ta) associated to crystal lattice of a niobium mineral (pyrochlore). Th, U, and Ta dissolution factors in vitro were obtained using the Gamble solution (simulant lung fluid, SLF), particle induced X-ray emission, and alpha spectrometry as analytical techniques. Ta, Th, and U are present in the pyrochlore crystal lattice as oxide; however, they have shown different dissolution parameters. The rapid dissolution fraction (f r), rapid dissolution rate (λ r), slow dissolution rate (f s), and slow dissolution fraction (λ s) measured for tantalum oxide were equal to 0.1 and 0.45 and 0.00007 day⁻¹, respectively. For uranium oxide, f r was equal to 0.05, λ r was equal to 1.1 day⁻¹, and λ s was equal to 0.000068 day⁻¹. For thorium oxide, f r was 0.025, λ r was 1.5 day⁻¹, and λ s was 0.000065 day⁻¹. These results show that chemical behavior of these three compounds in the SLF could not be represented by the same parameter. The ratio of uranium concentration in urine and feces samples from workers exposed to pyrochlore dust particle was determined. These values agree with the theoretical values of estimated uranium concentration using specific parameters for uranium oxide present in pyrochlore.
Bibliography:	http://dx.doi.org/10.1007/s11270-009-0071-3 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0049-6979 1573-2932
DOI:	10.1007/s11270-009-0071-3