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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
12/12/2017 |
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Data da última atualização: |
29/01/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BATISTA, A. H.; MELO, V. F.; RATE, A. W.; UHLMANN, A.; GILKES, R. |
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Afiliação: |
Universidade Federal do Paraná; Universidade Federal do Paraná; The University of Western Australia; ALEXANDRE UHLMANN, CNPF; The University of Western Australia. |
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Título: |
More aggressive sequential extraction procedure to access stable forms of Pb and As in clay minerals of soils. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Applied Clay Science, v. 147, p. 44-53, Oct. 2017. |
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DOI: |
http://dx.doi.org/10.1016/j.clay.2017.05.020 |
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Idioma: |
Inglês |
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Conteúdo: |
Lead (Pb) and arsenic (As) are potentially toxic in their most reactive forms, but can also occur as structural and specifically adsorbed (more stable forms) ions on clay minerals. Due to their lower mobility in soils, structural and specific adsorbed forms are usually neglected in environmental studies, but can be important, for example, in geochemistry researches. The aim of this study was to evaluate the occurrence of stable forms of Pb and As in the clay fraction of soils in a region rich in Pb ore (galena) in south Brazil using more aggressive sequential extractions (boiling 5 mol L−1 NaOH, successive citrate-bicarbonate-dithionite steps, and sodium bisulfate fusion). X-ray diffraction was used to follow possible mineralogical variations after each sequential extraction. We sampled soils from two areas rich in trace elements, with high occurrence of mineral deposits (PbS) in carbonate and phyllite/mica schist rocks. A reference soil formed on mineralized granite/gneiss was also sampled. In different mineral phases of the sequential extraction, preferential association of Pb with minerals extracted by 5 mol L−1 NaOH (kaolinite, low crystalline smectite and precipitated of Pb-S and Pb-P) was observed. In soils formed from parent materials at the phyllite/mica schist metamorphic stage, Pb contents solubilized by NaOH were extremely high (maximum > 28,000 mg kg−1 ). Lead exists in the mineral structure, such as Fe oxides, as result of the isomorphic substitution of Fe for Pb. Manganese oxides were also important host of Pb in the clay fraction. The largest As contents occurred at greater depth in the soil. The more aggressive sequential extraction procedure is more suitable to estimate the structural and specific adsorbed forms of Pb and As in clay minerals. MenosLead (Pb) and arsenic (As) are potentially toxic in their most reactive forms, but can also occur as structural and specifically adsorbed (more stable forms) ions on clay minerals. Due to their lower mobility in soils, structural and specific adsorbed forms are usually neglected in environmental studies, but can be important, for example, in geochemistry researches. The aim of this study was to evaluate the occurrence of stable forms of Pb and As in the clay fraction of soils in a region rich in Pb ore (galena) in south Brazil using more aggressive sequential extractions (boiling 5 mol L−1 NaOH, successive citrate-bicarbonate-dithionite steps, and sodium bisulfate fusion). X-ray diffraction was used to follow possible mineralogical variations after each sequential extraction. We sampled soils from two areas rich in trace elements, with high occurrence of mineral deposits (PbS) in carbonate and phyllite/mica schist rocks. A reference soil formed on mineralized granite/gneiss was also sampled. In different mineral phases of the sequential extraction, preferential association of Pb with minerals extracted by 5 mol L−1 NaOH (kaolinite, low crystalline smectite and precipitated of Pb-S and Pb-P) was observed. In soils formed from parent materials at the phyllite/mica schist metamorphic stage, Pb contents solubilized by NaOH were extremely high (maximum > 28,000 mg kg−1 ). Lead exists in the mineral structure, such as Fe oxides, as result of the isomorphic substi... Mostrar Tudo |
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Palavras-Chave: |
Isomorphic substitution; Pb-P precipitate; Pb-S precipitate. |
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Thesaurus Nal: |
iron oxides; kaolinite. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02554naa a2200241 a 4500
001 2082291
005 2018-01-29
008 2017 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/j.clay.2017.05.020$2DOI
100 1 $aBATISTA, A. H.
245 $aMore aggressive sequential extraction procedure to access stable forms of Pb and As in clay minerals of soils.$h[electronic resource]
260 $c2017
520 $aLead (Pb) and arsenic (As) are potentially toxic in their most reactive forms, but can also occur as structural and specifically adsorbed (more stable forms) ions on clay minerals. Due to their lower mobility in soils, structural and specific adsorbed forms are usually neglected in environmental studies, but can be important, for example, in geochemistry researches. The aim of this study was to evaluate the occurrence of stable forms of Pb and As in the clay fraction of soils in a region rich in Pb ore (galena) in south Brazil using more aggressive sequential extractions (boiling 5 mol L−1 NaOH, successive citrate-bicarbonate-dithionite steps, and sodium bisulfate fusion). X-ray diffraction was used to follow possible mineralogical variations after each sequential extraction. We sampled soils from two areas rich in trace elements, with high occurrence of mineral deposits (PbS) in carbonate and phyllite/mica schist rocks. A reference soil formed on mineralized granite/gneiss was also sampled. In different mineral phases of the sequential extraction, preferential association of Pb with minerals extracted by 5 mol L−1 NaOH (kaolinite, low crystalline smectite and precipitated of Pb-S and Pb-P) was observed. In soils formed from parent materials at the phyllite/mica schist metamorphic stage, Pb contents solubilized by NaOH were extremely high (maximum > 28,000 mg kg−1 ). Lead exists in the mineral structure, such as Fe oxides, as result of the isomorphic substitution of Fe for Pb. Manganese oxides were also important host of Pb in the clay fraction. The largest As contents occurred at greater depth in the soil. The more aggressive sequential extraction procedure is more suitable to estimate the structural and specific adsorbed forms of Pb and As in clay minerals.
650 $airon oxides
650 $akaolinite
653 $aIsomorphic substitution
653 $aPb-P precipitate
653 $aPb-S precipitate
700 1 $aMELO, V. F.
700 1 $aRATE, A. W.
700 1 $aUHLMANN, A.
700 1 $aGILKES, R.
773 $tApplied Clay Science$gv. 147, p. 44-53, Oct. 2017.
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Registro original: |
Embrapa Florestas (CNPF) |
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| Registros recuperados : 15 | |
| 3. |  | PIOTTO, V. C.; ROSA, P. R. DA; BASTOS, J. A.; ISSA, B. H. P.; BARBOSA, R. A. Características morfogênicas e estruturais do capim-massai sob diferentes estratégias de desfolhação. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE,5., 2009, Campo Grande, MS. [Anais da ...]. Campo Grande, MS: Embrapa Gado de Corte, 2009. 1 p.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 5. | | ISSA, B. H. P.; BASTOS, J. A.; ROSA, P. R. DA; PIOTTO, V. C.; BARBOSA, R. A. Fluxo de tecidos do capim-milênio sob regime de cortes. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE,5., 2009, Campo Grande, MS. [Anais da ...]. Campo Grande, MS: Embrapa Gado de Corte, 2009. 1 p.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 6. | | ROSA, P. R. da; BARBOSA, R. A.; SANTOS, V. A. C. dos; BASTOS, J. A.; TRINDADE, D. E. S. Efeito da intensidade e frequência de corte sobre as características morfogênicas e estruturais do capim piatã. In: SIMPÓSIO, 7.; CONGRESSO DE FORRAGICULTURA E PASTAGENS, 3., 2009, Lavras. Anais... Lavras: UFLA, 2009. 4 p. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 7. | | OLIVEIRA, R. G. de; MORAES, S. A. de; SALIBA, E. de O. S.; BORGES, I.; ROSA, P. R. da; COSTA, S. A. P. Balanço energético de caprinos alimentados com dietas contendo bagaço do caju (Anacardium occidentale L.). In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 47., 2010, Salvador. Empreendedorismo e progresso científico na zootecnia brasileira: anais. Salvador: SBZ, 2010. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| 8. | | COSTA, S. A. P.; MORAES, S. A. de; SALIBA, E. de O. S.; NEIVA, J. N. M.; SALLA, L. E.; ROSA, P. R. da. Balanço energético de caprinos alimentados com dietas contendo farelo da castanha de caju (Anacardium occidentale L.). In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 47., 2010, Salvador. Empreendedorismo e progresso científico na zootecnia brasileira: anais. Salvador: SBZ, 2010. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| 9. | | SANTOS, V. A. C.; BARBOSA, R. A.; BASTOS, J. A.; MARTINS, L. A. O.; ROSA, P. R. da; SOUZA, M. S. A. de; MEDEIROS, R. de A. Acúmulo de biomassa de gramíneas sob diferentes regimes de desfolha. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE, 3., 2007, Campo Grande, MS. Anais [da]... Campo Grande, MS: Embrapa Gado de Corte, 2007. p. 68 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 10. | | MARTINS, L. A. O.; BARBOSA, R. A.; BASTOS, J. A.; ROSA, P. R. da; SANTOS, V. A. C.; SOUZA, M. S. A. de; MEDEIROS, R. de A. Características morfogênicas e estruturais de cultivares de Brachiaria brizantha sob regimes de corte. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE, 3., 2007, Campo Grande, MS. Anais [da]... Campo Grande, MS: Embrapa Gado de Corte, 2007. p.32 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 11. | | ROSA, P. R. da; BARBOSA, R. A.; BASTOS, J. A.; MARTINS, L. A. O.; SANTOS, V. A. C.; SOUZA, M. S. A. de; MEDEIROS, R. de A. Fluxo de tecidos em gramíneas do gênero Panicum sob diferentes regimes de desfolha. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE, 3., 2007, Campo Grande, MS. Anais [da]... Campo Grande, MS: Embrapa Gado de Corte, 2007. p. 64 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 12. | | ROSA, P. R. da; MORAES, S. A. de; SALIBA, E. de O. S.; NEIVA, J. N. M.; BORGES, I.; LIMA, D. M. de; MORAES, D. R. de. Consumo dos nutrientes em caprinos alimentados com dietas contendo bagaço de caju desidratado (Anacardium occidentale L.). In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 45., 2008, Lavras. Biotecnologia e sustentabilidade: anais. Lavras: UFLA: SBZ, 2008. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Semiárido. |
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| 13. | | PAIVA, L. M.; FONSECA, D. M. da; BARBOSA, R. A.; FERNANDES, H. J.; SILVA NETO, I. M. da; ROSA, P. R. da. Teor de sílica em cultivares de Brachiaria brizantha sob alagamento. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 47., 2010, Salvador. Empreendedorismo e progresso científicos na zootecnia brasileira de vanguarda: anais. Salvador: SBZ, 2010. 1 CD-ROM. 3 p. R5765| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 14. | | SILVA, A. G. M.; BORGES, I.; NEIVA, J. N.; RODRIGUEZ, N. M.; SALIBA, E. de O. S.; MORAES, S. A. de; MERLO, F. A.; ROSA, P. R. da; SOUSA, T. A. S.; ASSIS, B. S. de. Consumo de matéria seca, matéria orgânica, proteína bruta e extratoetério em ovinos recebendo feno de Tifton-85 e níveis crescentes de castanha de cajú. In: SIMPÓSIO INTERNACIONAL SOBRE CAPRINOS E OVINOS DE CORTE, 3., 2007, João Pessoa. Anais... João Pessoa: SEBRAE-PB: EMEPA-PB, 2007. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Semiárido. |
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| 15. | | MERLO, F. A.; SILVA, A. G. M. e; BORGES, I.; NEIVA, J. N.; RODRIGUEZ, N. M.; SALIBA, E. de O. S.; MORAES, S. A. de; ASSIS, B. S. de; ROSA, P. R. da; LIMA, D. de; MAGALHÂES JUNIOR, L. L. de. Valor nutritivo do farelo de coco em ovinos: digestibilidade aparente da matéria seca, matéria orgânica, proteína bruta e extrato etéreo. In: SIMPÓSIO INTERNACIONAL SOBRE CAPRINOS E OVINOS DE CORTE, 3., 2007, João Pessoa. Anais... João Pessoa: SEBRAE-PB: EMEPA-PB, 2007. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Semiárido. |
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| Registros recuperados : 15 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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