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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
24/06/2021 |
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Data da última atualização: |
24/06/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BORGES, R. C.; MAHLER, C. F.; GOMES, A. C. dos S.; BALIEIRO, F. de C.; BELLIDO, A. V. B.; SOUZA, W. F. L. de. |
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Afiliação: |
RENATA COURA BORGES, UFRJ; CLÁUDIO FERNANDO MAHLER, UFRJ; ANNA CAROLINA DOS SANTOS GOMES, UFRJ; FABIANO DE CARVALHO BALIEIRO, CNPS; ALFREDO VICTOR BERNEDO BELLIDO, UFF; WEBER FRIEDERICHS LANDIM DE SOUZA, INT. |
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Título: |
Radiological characterization of the area impacted by the Mariana dam disaster, in Mariana City-MG-Brazil. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Environmental Earth Sciences, v. 80, 442, 2021. |
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DOI: |
https://doi.org/10.1007/s12665-021-09649-9 |
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Idioma: |
Inglês |
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Conteúdo: |
This study was developed with the aim of determining the activity concentration of Ra-226, Ra-228, Pb-210 and K-40 in samples of technosols (soils formed by the deposition of tailings from the dam rupture on the banks of rivers and in riverside regions) and in natural soils from the Mariana region in Minas Gerais, after the Mariana tragedy, which is considered the biggest accident in terms of volume of material dumped. The soil samples were analyzed by gamma spectrometry in a hyperpure germanium detector system. The concentrations of all studied radionuclides were higher in the natural soils of Mariana (Ra-226 471-1204 Bq kg(-1), for Ra-228 415-789 Bq kg(-1), for Pb-210 327-641 Bq kg(-1) and for K-40 707-2080 Bq kg(-1)) than in the technosols formed after the accident (Ra-226 of 179-384 Bq kg(-1), for Ra-228 of 60-269 Bq kg(-1), for Pb-210 of 463-818 Bq kg(-1) and for K-40 of 105-204 Bq kg(-1)), indicating that the region may present some type of radioactive anomaly or that the use of fertilizers in agricultural soils may have promoted some increase in these elements. On the other hand, the concentrations in the technosols were high when compared with tailings from iron mining in other countries (42 Bq kg(-1) for Ra-226 and 16 Bq kg(-1) for Pb-210), as well as tailings from phosphorus mining in Brazil and in the world. It is admitted that these high values are the result of the mixture of pure tailings with the natural soil of the region, that presented radioactive anomaly, and also result of the peculiar geology of Mina Alegria. MenosThis study was developed with the aim of determining the activity concentration of Ra-226, Ra-228, Pb-210 and K-40 in samples of technosols (soils formed by the deposition of tailings from the dam rupture on the banks of rivers and in riverside regions) and in natural soils from the Mariana region in Minas Gerais, after the Mariana tragedy, which is considered the biggest accident in terms of volume of material dumped. The soil samples were analyzed by gamma spectrometry in a hyperpure germanium detector system. The concentrations of all studied radionuclides were higher in the natural soils of Mariana (Ra-226 471-1204 Bq kg(-1), for Ra-228 415-789 Bq kg(-1), for Pb-210 327-641 Bq kg(-1) and for K-40 707-2080 Bq kg(-1)) than in the technosols formed after the accident (Ra-226 of 179-384 Bq kg(-1), for Ra-228 of 60-269 Bq kg(-1), for Pb-210 of 463-818 Bq kg(-1) and for K-40 of 105-204 Bq kg(-1)), indicating that the region may present some type of radioactive anomaly or that the use of fertilizers in agricultural soils may have promoted some increase in these elements. On the other hand, the concentrations in the technosols were high when compared with tailings from iron mining in other countries (42 Bq kg(-1) for Ra-226 and 16 Bq kg(-1) for Pb-210), as well as tailings from phosphorus mining in Brazil and in the world. It is admitted that these high values are the result of the mixture of pure tailings with the natural soil of the region, that presented radioactive anomaly, ... Mostrar Tudo |
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Palavras-Chave: |
Concentração de Radionuclídeo; Quantum GIS; Tecnossolo. |
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Thesagro: |
Solo. |
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Thesaurus Nal: |
Radionuclides; Technosols. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02371naa a2200265 a 4500
001 2132542
005 2021-06-24
008 2021 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s12665-021-09649-9$2DOI
100 1 $aBORGES, R. C.
245 $aRadiological characterization of the area impacted by the Mariana dam disaster, in Mariana City-MG-Brazil.$h[electronic resource]
260 $c2021
520 $aThis study was developed with the aim of determining the activity concentration of Ra-226, Ra-228, Pb-210 and K-40 in samples of technosols (soils formed by the deposition of tailings from the dam rupture on the banks of rivers and in riverside regions) and in natural soils from the Mariana region in Minas Gerais, after the Mariana tragedy, which is considered the biggest accident in terms of volume of material dumped. The soil samples were analyzed by gamma spectrometry in a hyperpure germanium detector system. The concentrations of all studied radionuclides were higher in the natural soils of Mariana (Ra-226 471-1204 Bq kg(-1), for Ra-228 415-789 Bq kg(-1), for Pb-210 327-641 Bq kg(-1) and for K-40 707-2080 Bq kg(-1)) than in the technosols formed after the accident (Ra-226 of 179-384 Bq kg(-1), for Ra-228 of 60-269 Bq kg(-1), for Pb-210 of 463-818 Bq kg(-1) and for K-40 of 105-204 Bq kg(-1)), indicating that the region may present some type of radioactive anomaly or that the use of fertilizers in agricultural soils may have promoted some increase in these elements. On the other hand, the concentrations in the technosols were high when compared with tailings from iron mining in other countries (42 Bq kg(-1) for Ra-226 and 16 Bq kg(-1) for Pb-210), as well as tailings from phosphorus mining in Brazil and in the world. It is admitted that these high values are the result of the mixture of pure tailings with the natural soil of the region, that presented radioactive anomaly, and also result of the peculiar geology of Mina Alegria.
650 $aRadionuclides
650 $aTechnosols
650 $aSolo
653 $aConcentração de Radionuclídeo
653 $aQuantum GIS
653 $aTecnossolo
700 1 $aMAHLER, C. F.
700 1 $aGOMES, A. C. dos S.
700 1 $aBALIEIRO, F. de C.
700 1 $aBELLIDO, A. V. B.
700 1 $aSOUZA, W. F. L. de
773 $tEnvironmental Earth Sciences$gv. 80, 442, 2021.
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Registro original: |
Embrapa Solos (CNPS) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
03/12/2020 |
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Data da última atualização: |
03/12/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SILVA, A. B. S.; HIGUERA, J. M.; BRAZ, C. E. M.; MACHADO, R. C.; NOGUEIRA, A. R. de A. |
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Afiliação: |
Ana Beatriz S. Silva, UFSCAR; Julymar M. Higuera, UFSCAR; CARLOS EDUARDO M. BRAZ, UFSCAR; RAQUEL CARDOSO MACHADO, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Evaluation of different nebulizers performance on microwave-induced plasma optical emission spectrometry. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Spectrochimica Acta Part B, v. 168, p. 1614-1620, 105867, jun. 2020. |
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DOI: |
https://doi.org/10.1016/j.sab.2020.105867 |
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Idioma: |
Inglês |
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Conteúdo: |
The choice of an adequate nebulizer reflects directly in the accuracy, especially when a complex matrix is analyzed in plasma techniques. To unveil the effects on fundamental parameters and analytical performance of a microwave-induced plasma optical emission spectrometry, four commercial nebulizers, Concentric, Mira Mist, OneNeb series 1, and OneNeb series 2, were evaluated. Estimated fundamental plasma parameters, excitation temperature (T), and the number of electron density (ne) indicated that the Mira Mist nebulizer afforded a plasma with the highest T and ne, but the lowest solvent transport efficiency. OneNeb series 2 showed the lowest T and ne, nonetheless the highest solvent transport efficiency. The precision was estimated in the middle of nitric acid (1% v v-1), sulfuric acid (1% v v-1), easily ionizable elements (100 mg L-1 of Ba, K, and Na), ethanol (1% v v-1), and carbon content (1000 mg L-1). The OneNeb series 2 presented the lowest RSD and LOD values in all matrices, while the concentric presented the highest RSD. The accuracy was evaluated by certified reference materials and addition and recovery experiments performed in sugarcane spirit. Considering the sensitivity improvement, solvent transport efficiency and analytical precision the OneNeb series 2 achieved superior performance. |
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Palavras-Chave: |
Concentric; Crossflow; Enhanced parallel path; Optical emission spectrometry; Pneumatic nebulizer. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02110naa a2200241 a 4500
001 2127529
005 2020-12-03
008 2020 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.sab.2020.105867$2DOI
100 1 $aSILVA, A. B. S.
245 $aEvaluation of different nebulizers performance on microwave-induced plasma optical emission spectrometry.$h[electronic resource]
260 $c2020
520 $aThe choice of an adequate nebulizer reflects directly in the accuracy, especially when a complex matrix is analyzed in plasma techniques. To unveil the effects on fundamental parameters and analytical performance of a microwave-induced plasma optical emission spectrometry, four commercial nebulizers, Concentric, Mira Mist, OneNeb series 1, and OneNeb series 2, were evaluated. Estimated fundamental plasma parameters, excitation temperature (T), and the number of electron density (ne) indicated that the Mira Mist nebulizer afforded a plasma with the highest T and ne, but the lowest solvent transport efficiency. OneNeb series 2 showed the lowest T and ne, nonetheless the highest solvent transport efficiency. The precision was estimated in the middle of nitric acid (1% v v-1), sulfuric acid (1% v v-1), easily ionizable elements (100 mg L-1 of Ba, K, and Na), ethanol (1% v v-1), and carbon content (1000 mg L-1). The OneNeb series 2 presented the lowest RSD and LOD values in all matrices, while the concentric presented the highest RSD. The accuracy was evaluated by certified reference materials and addition and recovery experiments performed in sugarcane spirit. Considering the sensitivity improvement, solvent transport efficiency and analytical precision the OneNeb series 2 achieved superior performance.
653 $aConcentric
653 $aCrossflow
653 $aEnhanced parallel path
653 $aOptical emission spectrometry
653 $aPneumatic nebulizer
700 1 $aHIGUERA, J. M.
700 1 $aBRAZ, C. E. M.
700 1 $aMACHADO, R. C.
700 1 $aNOGUEIRA, A. R. de A.
773 $tSpectrochimica Acta Part B$gv. 168, p. 1614-1620, 105867, jun. 2020.
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