| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
|
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 |
|
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.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Florestas (CNPF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Amazônia Oriental. |
|
Data corrente: |
11/12/2017 |
|
Data da última atualização: |
22/12/2021 |
|
Tipo da produção científica: |
Artigo em Anais de Congresso |
|
Autoria: |
BENCHIMOL, R. L.; SANTOS, A. K. A.; PALMEIRA, T. dos S.; PINHEIRO, C. C. C.; SILVA, C. M. da; LEÃO, N. V. M. |
|
Afiliação: |
RUTH LINDA BENCHIMOL, CPATU; Ana Karoliny Alves Santos, GRADUANDA UFRA; Thaís dos Santos Palmeira, Eng. Florestal; Cássia Cristina Chaves Pinheiro, GRADUANDA UFRA; Carina Melo da Silva, DOUTORA EM AGRONOMIA; NOEMI VIANNA MARTINS LEAO, CPATU. |
|
Título: |
Crescimento micelial de Colletotrichum sp. isolado de sumaumeira em diferentes regimes de luz e meio de cultura. |
|
Ano de publicação: |
2017 |
|
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE AGRONOMIA, 30., 2017, Fortaleza. Segurança hídrica: um desafio para os engenheiros agrônomos do Brasil: [anais]. Fortaleza: AEAC: CONFAEAB, 2017. |
|
Idioma: |
Português |
|
Conteúdo: |
A planta da sumaumeira (Ceiba pentandra), pertencente à família Bombacaceae, é mundialmente conhecida por suas múltiplas utilidades e qualidade da madeira. No entanto, essa cultura pode ser atacada, na fase de viveiro, por fitopatógenos que prejudicam o desenvolvimento e a qualidade das mudas. Objetivou-se avaliar o efeito da luminosidade e de diferentes meios de cultura no crescimento micelial in vitro de Colletotrichum sp., patógeno isolado de folhas de mudas de sumaumeira . Foram testados os meios de cultura BDA, Extrato de Malte e V8, em placas de Petri, no centro das quais foram colocados discos de micélio do patógeno, sendo mantidas à temperatura de 25±2 ºC, sob os regimes de luminosidade claro contínuo, escuro contínuo e alternado (12 horas claro/ 12 horas escuro). O delineamento experimental foi inteiramente casualizado, em esquema fatorial 3x3, com cinco repetições. Foi avaliado o diâmetro das colônias e calculado o Índice de Velocidade de Crescimento Micelial (IVCM) do patógeno. O maior IVCM do patógeno foi observado no meio V8, sob regime claro contínuo, quando comparados aos demais tratamentos, sendo estas condições as mais indicadas para futuros estudos que envolvam o cultivo de Colletortrichum sp. |
|
Palavras-Chave: |
Colletotrichum sp; Espécie florestal; Luminosidade; Sumaúma. |
|
Thesagro: |
Ceiba pentandra; Crescimento. |
|
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/168619/1/Colletotrichum-CBA.pdf
|
|
Marc: |
LEADER 02120nam a2200241 a 4500
001 2082094
005 2021-12-22
008 2017 bl uuuu u00u1 u #d
100 1 $aBENCHIMOL, R. L.
245 $aCrescimento micelial de Colletotrichum sp. isolado de sumaumeira em diferentes regimes de luz e meio de cultura.$h[electronic resource]
260 $aIn: CONGRESSO BRASILEIRO DE AGRONOMIA, 30., 2017, Fortaleza. Segurança hídrica: um desafio para os engenheiros agrônomos do Brasil: [anais]. Fortaleza: AEAC: CONFAEAB$c2017
520 $aA planta da sumaumeira (Ceiba pentandra), pertencente à família Bombacaceae, é mundialmente conhecida por suas múltiplas utilidades e qualidade da madeira. No entanto, essa cultura pode ser atacada, na fase de viveiro, por fitopatógenos que prejudicam o desenvolvimento e a qualidade das mudas. Objetivou-se avaliar o efeito da luminosidade e de diferentes meios de cultura no crescimento micelial in vitro de Colletotrichum sp., patógeno isolado de folhas de mudas de sumaumeira . Foram testados os meios de cultura BDA, Extrato de Malte e V8, em placas de Petri, no centro das quais foram colocados discos de micélio do patógeno, sendo mantidas à temperatura de 25±2 ºC, sob os regimes de luminosidade claro contínuo, escuro contínuo e alternado (12 horas claro/ 12 horas escuro). O delineamento experimental foi inteiramente casualizado, em esquema fatorial 3x3, com cinco repetições. Foi avaliado o diâmetro das colônias e calculado o Índice de Velocidade de Crescimento Micelial (IVCM) do patógeno. O maior IVCM do patógeno foi observado no meio V8, sob regime claro contínuo, quando comparados aos demais tratamentos, sendo estas condições as mais indicadas para futuros estudos que envolvam o cultivo de Colletortrichum sp.
650 $aCeiba pentandra
650 $aCrescimento
653 $aColletotrichum sp
653 $aEspécie florestal
653 $aLuminosidade
653 $aSumaúma
700 1 $aSANTOS, A. K. A.
700 1 $aPALMEIRA, T. dos S.
700 1 $aPINHEIRO, C. C. C.
700 1 $aSILVA, C. M. da
700 1 $aLEÃO, N. V. M.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Amazônia Oriental (CPATU) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
