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5. | | GOULART, I. C. G. dos R.; BRASILEIRO, B.; OLIVEIRA, R.; SANTIN, D.; PENTEADO JÚNIOR, J. F. Estimativa do rendimento potencial de erva-mate plantada em São Mateus do Sul, Paraná, Brasil. Pesquisa Florestal Brasileira, Colombo, v. 39, (nesp), e201902043, 2019. p. 433. Edição especial dos resumos do IUFRO World Congress, 25., 2019, Curitiba. Biblioteca(s): Embrapa Florestas. |
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Registros recuperados : 37 | |
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Registro Completo
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
12/12/2017 |
Data da última atualização: |
29/01/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
BATISTA, A. H.; MELO, V. F.; RATE, A. W.; UHLMANN, A.; GILKES, R. |
Afiliação: |
Universidade Federal do Paraná; Universidade Federal do Paraná; The University of Western Australia; ALEXANDRE UHLMANN, CNPF; The University of Western Australia. |
Título: |
More aggressive sequential extraction procedure to access stable forms of Pb and As in clay minerals of soils. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Applied Clay Science, v. 147, p. 44-53, Oct. 2017. |
DOI: |
http://dx.doi.org/10.1016/j.clay.2017.05.020 |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Isomorphic substitution; Pb-P precipitate; Pb-S precipitate. |
Thesaurus NAL: |
iron oxides; kaolinite. |
Categoria do assunto: |
-- |
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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1. | | 0904532, ANUÁRIO BRASILEIRO DA AGRICULTURA FAMILIAR, Erechim, RS Biblioteca(s): Catálogo Coletivo de Periódicos Embrapa; Embrapa Agricultura Digital; Embrapa Agroindústria Tropical; Embrapa Agropecuária Oeste; Embrapa Amapá; Embrapa Amazônia Oriental; Embrapa Cerrados; Embrapa Hortaliças; Embrapa Mandioca e Fruticultura; Embrapa Semiárido; Embrapa Soja; Embrapa Solos; Embrapa Territorial; Embrapa Unidades Centrais; Embrapa Uva e Vinho. MenosCatálogo Coletivo de Periódicos Embrapa; Embrapa Agricultura Digital; Embrapa Agroindústria Tropical; Embrapa Agropecuária Oeste; Embrapa Amapá; Embrapa Amazônia Oriental; Embrapa Cerrados; Embrapa Hortaliças; Embrapa Mandioca e Fruticultura; Embrapa Semiárido... Mostrar Todas | |
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