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| Registros recuperados : 60 | |
| 12. |  | PARRON, L. M.; BUSTAMANTE, M. M. da C.; PRADO, C. L. C. Dinamica da mineralizacao liquida de N-inorganico em um gradiente topografico em mata de galeria do Distrito Federal. In: REUNIAO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRICAO DE PLANTAS, 25.; REUNIAO BRASILEIRA SOBRE MICORRIZAS, 9.; SIMPOSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 7.; REUNIAO BRASILEIRA DE BIOLOGIA DO SOLO, 4., 2002, Rio de Janeiro. FertBio 2002: agricultura: bases ecologicas para o desenvolvimento social e economico sustentado. Rio de Janeiro: [s. n.], 2002.| Biblioteca(s): Embrapa Cerrados. |
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| 14. | | RONQUIM, C. C.; PRADO, C. H. B. de A.; AVELLAR, L. M. de. Effects of contrasting irradiances on carbon balance, biomass partition, and leaf nutrient contents in brazilian cerrado woody species. In: CONGRESSO NACIONAL DE BOTÂNICA, 59., 2008. Anais: atualidades, desafios e perspectivas da Botânica no Brasil. Natal, RN: Imagem Gráfica, 2008. 1p. 1-CD-ROM| Biblioteca(s): Embrapa Territorial. |
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| 16. | | SANTOS, E. P. dos; ARAUJO, E. C. E.; PRADO, C. H. B. de A. Estimativa da área foliar da mangueira (mangífera indica L.) cv. haden, utilizando dimensões lineares. In: CONGRESSO NACIONAL DE BOTÂNICA, 55.; REUNIÃO REGIONAL DE BOTÂNICOS DE MG, BA E ES, 26., 2004, Viçosa. Conservação, bioprospecção e biotecnologia:[resumos]. Viçosa: Sociedade Botânica do Brasil: Universidade Federal Viçosa, 2004.| Biblioteca(s): Embrapa Meio-Norte. |
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| 19. | | RONQUIM, C. C.; PRADO, C. H. B. A.; CASALI, S. P. Balanco de carbono em individuos jovens de Copaifera langsdorffii desf. cultivadas sob irradiacao solar plena e em sub-bosque. Brazilian Journal of Plant Physiology, Campinas, v. 15, p. 61, 2003. Suplemento. Resumo de trabalho apresentado no 9º Congresso Brasileiro de Fisiologia Vegetal, Atibaia, SP, setembro 2003.| Biblioteca(s): Embrapa Cerrados. |
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| 20. | | PARRON, L. M.; BUSTAMANTE, M. M. C.; MARKEWITZ, D.; PRADO, C. L. Availability of Nutrients in Solutions in a Gallery Forest of Cerrado Biome. In: CONFERÊNCIA CIENTÍFICA DO LBA, 3., 2004, Brasília, DF. Anais de trabalhos completos. Brasília, DF: LBA, 2004. Resumo 37.11-P.| Biblioteca(s): Embrapa Florestas. |
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| Registros recuperados : 60 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
28/08/2000 |
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Data da última atualização: |
17/01/2022 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
KAMOGAWA, M. Y.; NOGUEIRA, A. R. de A.; ARTIGAS, J.; ALONSO, J. |
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Afiliação: |
MARCOS Y. KAMOGAWA, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JUDIT ARTIGAS, UNIVERSITAT AUTNNOMA DE BARCELONA; JULIÁN ALONSO, UNIVERSITAT AUTNNOMA DE BARCELONA. |
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Título: |
Soil calcareous efficiency using pervaporation coupled to a sequential injection system. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON FLOW ANALYSIS, 8., 2000, Warsaw. Warsaw: Polish Chemical Society, 2000. p.147. |
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Idioma: |
Português |
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Conteúdo: |
Acid soils normally require an amount of calcareous or other base to neutralise tlse acidity from the initial acidity occurs to selected less acidity. The following between theacidity components; with the enhanced amounts of exchangeable calcium and magnesium, an inactivation of exchangeable aluminium and the increase of the pH occur, giving most favourable plant growth. It is attained with the calcareous application. Huwever, the use of excessive doses of calcium carbonate, associated with the bad distribution and incorporation, can result in the decrease of other nutrients' readiness or the occurrence of some diseases. It is also sometime altered on the basis of economic con-siderations. The disolution of carbonate in acid and determination of the evolved CO> is one of the proposed methods for determining residual calcareous. In this work a sequential injection system coupled to a pervaporation unit for the CO ondutimetric determination is proposed. With the use of the pervaporation unit it was possible the use of soljQ samples without previous treatment. The proposed system was constructed with the use of a six way solenoid valve, a conductivity meter with an RS 232 connection and a PC microcomputer for data acquisition and externa! controls. The pre-concentration of the CO> evolved from the solid samples with the injection of 5.0 mL of 1.0 mol L ' HCI was done after passing through a Teflon" hydrophobic membrane. The COz was then captured by a water acceptor stream and directed to the detector. Amounts of 3.0 g of dry samples were directly weighted in the donor compartment of the pervaporation chamber. The CO~ amounts in the samples were determined with an analytical curve from 5.0x10 ' to 5.0x10' mol L ' of CO>. This curve was constructed with the matrix matching approach and showed a linear regression y=13.58+5S4.77x(R'=0.9962). Eleven soils with different lime amounts were analysed by the proposed methodology and the results were in accordance (slope 1.02+0.03; intersection 6+7) with the official method, that uses calcium difference between the total, extracted with HCI 1.0 mol L ' and exchangeable, extracted with the KCI 1.0 mol L '. The proposed method presented analytical frequency of 17 samples h ', detection lirnit of 8.0x10 ' mol L' of CO> and rsd < 3%, and the possibility of the residual calcareMenosAcid soils normally require an amount of calcareous or other base to neutralise tlse acidity from the initial acidity occurs to selected less acidity. The following between theacidity components; with the enhanced amounts of exchangeable calcium and magnesium, an inactivation of exchangeable aluminium and the increase of the pH occur, giving most favourable plant growth. It is attained with the calcareous application. Huwever, the use of excessive doses of calcium carbonate, associated with the bad distribution and incorporation, can result in the decrease of other nutrients' readiness or the occurrence of some diseases. It is also sometime altered on the basis of economic con-siderations. The disolution of carbonate in acid and determination of the evolved CO> is one of the proposed methods for determining residual calcareous. In this work a sequential injection system coupled to a pervaporation unit for the CO ondutimetric determination is proposed. With the use of the pervaporation unit it was possible the use of soljQ samples without previous treatment. The proposed system was constructed with the use of a six way solenoid valve, a conductivity meter with an RS 232 connection and a PC microcomputer for data acquisition and externa! controls. The pre-concentration of the CO> evolved from the solid samples with the injection of 5.0 mL of 1.0 mol L ' HCI was done after passing through a Teflon" hydrophobic membrane. The COz was then captured by a water acceptor stream and d... Mostrar Tudo |
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Palavras-Chave: |
Injeção seqüencial; Sequential injection; Sistema; Soil Calcareous; System. |
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Thesagro: |
Calcário; Solo. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/45116/1/digitalizar0003.pdf
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|
Marc: |
LEADER 03137nam a2200229 a 4500
001 1045116
005 2022-01-17
008 2000 bl uuuu u00u1 u #d
100 1 $aKAMOGAWA, M. Y.
245 $aSoil calcareous efficiency using pervaporation coupled to a sequential injection system.$h[electronic resource]
260 $aIn: INTERNATIONAL CONFERENCE ON FLOW ANALYSIS, 8., 2000, Warsaw. Warsaw: Polish Chemical Society, 2000. p.147.$c2000
520 $aAcid soils normally require an amount of calcareous or other base to neutralise tlse acidity from the initial acidity occurs to selected less acidity. The following between theacidity components; with the enhanced amounts of exchangeable calcium and magnesium, an inactivation of exchangeable aluminium and the increase of the pH occur, giving most favourable plant growth. It is attained with the calcareous application. Huwever, the use of excessive doses of calcium carbonate, associated with the bad distribution and incorporation, can result in the decrease of other nutrients' readiness or the occurrence of some diseases. It is also sometime altered on the basis of economic con-siderations. The disolution of carbonate in acid and determination of the evolved CO> is one of the proposed methods for determining residual calcareous. In this work a sequential injection system coupled to a pervaporation unit for the CO ondutimetric determination is proposed. With the use of the pervaporation unit it was possible the use of soljQ samples without previous treatment. The proposed system was constructed with the use of a six way solenoid valve, a conductivity meter with an RS 232 connection and a PC microcomputer for data acquisition and externa! controls. The pre-concentration of the CO> evolved from the solid samples with the injection of 5.0 mL of 1.0 mol L ' HCI was done after passing through a Teflon" hydrophobic membrane. The COz was then captured by a water acceptor stream and directed to the detector. Amounts of 3.0 g of dry samples were directly weighted in the donor compartment of the pervaporation chamber. The CO~ amounts in the samples were determined with an analytical curve from 5.0x10 ' to 5.0x10' mol L ' of CO>. This curve was constructed with the matrix matching approach and showed a linear regression y=13.58+5S4.77x(R'=0.9962). Eleven soils with different lime amounts were analysed by the proposed methodology and the results were in accordance (slope 1.02+0.03; intersection 6+7) with the official method, that uses calcium difference between the total, extracted with HCI 1.0 mol L ' and exchangeable, extracted with the KCI 1.0 mol L '. The proposed method presented analytical frequency of 17 samples h ', detection lirnit of 8.0x10 ' mol L' of CO> and rsd < 3%, and the possibility of the residual calcare<ius determination without samples pre-treatment.
650 $aCalcário
650 $aSolo
653 $aInjeção seqüencial
653 $aSequential injection
653 $aSistema
653 $aSoil Calcareous
653 $aSystem
700 1 $aNOGUEIRA, A. R. de A.
700 1 $aARTIGAS, J.
700 1 $aALONSO, J.
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