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| 15. |  | BATISTELLA, M.; ARTAXO, P.; NOBRE, C.; BUSTAMANTE, M.; LUIZÃO, F. Results from LBA and vision for future Amazonian research. In: KELLER, M.; BUSTAMANTE, M.; GASH, J.; DIAS, P. S. (Ed.). Amazonia and global change. Washington: American Geophysical Union, 2009. p. 555-563 (Geophysical Monograph Series, 186)| Biblioteca(s): Embrapa Territorial. |
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| 20. | | BULBOVAS, P.; SOUZA, S. R. de; MORAES, R. M. de; LUIZÃO, F.; ARTAXO, P. Plântulas de soja 'Tracajá' expostas ao ozônio sob condições controladas. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 42, n. 5, p. 641-646, maio 2007 Título em inglês: Soybean 'Tracajá' seedlings exposed to ozone under controlled conditions.| Biblioteca(s): Embrapa Unidades Centrais. |
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| Registros recuperados : 36 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
22/12/1999 |
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Autoria: |
CRUVINEL, P. E.; CRESTANA, S.; ARTAXO NETTO, P. E. |
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Afiliação: |
EMBRAPA-CNPDIA; USP-Instituto de Fisica. |
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Título: |
Management and measurements of the metals chromium and zinc in an agricultural field by PIXE. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: CONFERENCE ON ENVIRONMETRICS IN BRAZIL, INTERNATIONAL CONFERENCE ON QUANTITATIVE METHODS FOR THE ENVIRONMENTAL SCIENCES, 7.,1996, São Paulo, SP. Abstracts... São Paulo: USP-IME, 1996. |
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Páginas: |
G22-G23. |
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Idioma: |
Inglês |
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Conteúdo: |
Although trace elements are minor components of the solid phase of soils, they play an important role in soil fertility, soil pollution, and life. This work demonstrates the suitability of PIXE as a fast and non-destructive technique useful to measure Cr and Zn content in soil samples. We have analyzed samples collected in the experimental field of Pindorama-SP, Brazil, part of the Agronomic Institute of Campinas, with coordinates of 48 degrees 55'W, and 21 degrees 13'S, inside an area of 50X100 meters, where the sampling points were 5 meters far from each other in a extending far downward below the surface of 15 centimeters. Each analytical techniques commercially available have their own limitations, however the proton induced X-ray emission technique has been used successfully in agronomic applications. The composition of soils is extremely diverse and, although governed by many different factors, climtic conditions and parent material predominate most commonly. As for biological samples many of the elements are of great importance for the nutrition of the plants, while others are toxic, and other have an unknown role. Moreover the knowledge of the behavior of polluting trace elements is far from complete. Chromium is of nutritional importance because it is required element in human and animal nutrition. It has been shown that most of the soil Cr occurs as Cr3+ and is within the mineral structures or forms of mixed Cr3+ and Fe3+ oxides. The immobility of Cr may be responsible for an inadequate Cr supply to plants. As for biological samples many of them are if great importance for the nutrition of the plants, while others are toxic, and others have an unknown role. Zinc is other important element, which seems to be distributed rather uniformly in magmatic rocks, and its slight decrease in acid rocks is observed. Zn is easily adsorbed by mineral and organic components and thus, in several soils types, its accumulation in the surface horizons is observed. The adsorption of Zn2+ can be reduced at lower pH, smaller than 7, by competing cations and this results leading to mobilization and leaching of Zn from light acid soils, which has an important practical impact on either the Zn availability or deficiency to plants. In the last years, nuclear techniques have given an important contribution in the field of environmetrics. For quantitative analysis of total Cr and Zn in soils, the PIXE method requires both the matrix correctons and codes for spectra reduction, however it takes few minutes to carry out a high number of analysis. MenosAlthough trace elements are minor components of the solid phase of soils, they play an important role in soil fertility, soil pollution, and life. This work demonstrates the suitability of PIXE as a fast and non-destructive technique useful to measure Cr and Zn content in soil samples. We have analyzed samples collected in the experimental field of Pindorama-SP, Brazil, part of the Agronomic Institute of Campinas, with coordinates of 48 degrees 55'W, and 21 degrees 13'S, inside an area of 50X100 meters, where the sampling points were 5 meters far from each other in a extending far downward below the surface of 15 centimeters. Each analytical techniques commercially available have their own limitations, however the proton induced X-ray emission technique has been used successfully in agronomic applications. The composition of soils is extremely diverse and, although governed by many different factors, climtic conditions and parent material predominate most commonly. As for biological samples many of the elements are of great importance for the nutrition of the plants, while others are toxic, and other have an unknown role. Moreover the knowledge of the behavior of polluting trace elements is far from complete. Chromium is of nutritional importance because it is required element in human and animal nutrition. It has been shown that most of the soil Cr occurs as Cr3+ and is within the mineral structures or forms of mixed Cr3+ and Fe3+ oxides. The immobility of Cr may be respons... Mostrar Tudo |
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Palavras-Chave: |
Agricultural instrumentation; Instrumentacao agropecuaria; Medida; Metais; PIXE; Techniques; Tecnicas. |
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Thesagro: |
Cromo; Solo; Zinco. |
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Thesaurus NAL: |
chromium; measurement; metals; soil. |
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Categoria do assunto: |
-- |
|
Marc: |
LEADER 03539naa a2200325 a 4500
001 1026986
005 1999-12-22
008 1996 bl --- 0-- u #d
100 1 $aCRUVINEL, P. E.
245 $aManagement and measurements of the metals chromium and zinc in an agricultural field by PIXE.
260 $c1996
300 $aG22-G23.
520 $aAlthough trace elements are minor components of the solid phase of soils, they play an important role in soil fertility, soil pollution, and life. This work demonstrates the suitability of PIXE as a fast and non-destructive technique useful to measure Cr and Zn content in soil samples. We have analyzed samples collected in the experimental field of Pindorama-SP, Brazil, part of the Agronomic Institute of Campinas, with coordinates of 48 degrees 55'W, and 21 degrees 13'S, inside an area of 50X100 meters, where the sampling points were 5 meters far from each other in a extending far downward below the surface of 15 centimeters. Each analytical techniques commercially available have their own limitations, however the proton induced X-ray emission technique has been used successfully in agronomic applications. The composition of soils is extremely diverse and, although governed by many different factors, climtic conditions and parent material predominate most commonly. As for biological samples many of the elements are of great importance for the nutrition of the plants, while others are toxic, and other have an unknown role. Moreover the knowledge of the behavior of polluting trace elements is far from complete. Chromium is of nutritional importance because it is required element in human and animal nutrition. It has been shown that most of the soil Cr occurs as Cr3+ and is within the mineral structures or forms of mixed Cr3+ and Fe3+ oxides. The immobility of Cr may be responsible for an inadequate Cr supply to plants. As for biological samples many of them are if great importance for the nutrition of the plants, while others are toxic, and others have an unknown role. Zinc is other important element, which seems to be distributed rather uniformly in magmatic rocks, and its slight decrease in acid rocks is observed. Zn is easily adsorbed by mineral and organic components and thus, in several soils types, its accumulation in the surface horizons is observed. The adsorption of Zn2+ can be reduced at lower pH, smaller than 7, by competing cations and this results leading to mobilization and leaching of Zn from light acid soils, which has an important practical impact on either the Zn availability or deficiency to plants. In the last years, nuclear techniques have given an important contribution in the field of environmetrics. For quantitative analysis of total Cr and Zn in soils, the PIXE method requires both the matrix correctons and codes for spectra reduction, however it takes few minutes to carry out a high number of analysis.
650 $achromium
650 $ameasurement
650 $ametals
650 $asoil
650 $aCromo
650 $aSolo
650 $aZinco
653 $aAgricultural instrumentation
653 $aInstrumentacao agropecuaria
653 $aMedida
653 $aMetais
653 $aPIXE
653 $aTechniques
653 $aTecnicas
700 1 $aCRESTANA, S.
700 1 $aARTAXO NETTO, P. E.
773 $tIn: CONFERENCE ON ENVIRONMETRICS IN BRAZIL, INTERNATIONAL CONFERENCE ON QUANTITATIVE METHODS FOR THE ENVIRONMENTAL SCIENCES, 7.,1996, São Paulo, SP. Abstracts... São Paulo: USP-IME, 1996.
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