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| Registros recuperados : 56 | |
| 28. |  | CERDEIRA, A. L.; SANTOS, N. A. G.; PESSOA, M. C. P. Y.; GOMES, M. A. F.; LANCHOTE, V. L. Herbicide leaching on a recharge área of Guarany Aquifer, Brazil. In: CONGRESSO BRASILEIRO DA CIÊNCIA DAS PLANTAS DANINHAS, 24., 2004, São Pedro. Anais... Londrina: SBCPD, 2004. 2p. Resumos Expandidos n. 105. 1 CD-ROM.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 29. | | CERDEIRA, A. L.; SANTOS, N. A. G.; PESSOA, M. C. P. Y.; GOMES, M. A. F.; LANCHOTE, V. L. Herbicide leaching on a recharge area of the Guarany Aquifer in Brazil. Journal of Environmental Science and Health. Part B, Pesticides, Food Contaminants, and Agricultural Wastes, New York, v. B40, n. 1, p. 159-165, 2005.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 31. | | CERDEIRA, A. L.; COUTINHO, H. L. da C.; SANTOS, N. A. G.; PARAIBA, L. C.; LANCHOTE, V. L. Comportamento de triazinas na bacia do Alto Taquari, Mato Grosso do Sul, Brasil. In: CONGRESSO BRASILEIRO DA CIÊNCIA DAS PLANTAS DANINHAS, 24., 2004, São Pedro. Anais... Londrina: SBCPD, 2004. 2p. Resumos Expandidos n. 104. 1 CD-ROM.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 32. | | SANTOS, N. A.; SANTOS, L. M.; COSTA, S.; ALMEIDA, L. A. da H.; GESTEIRA, A. da S. Indução de tetraploides em citros via deficit hídrico. In: SEMANA DE ATUALIZAÇÃO EM CIÊNCIAS AGRÁRIAS AMBIENTAIS E BIOLÓGICAS, 1., 2014, Cruz Das Almas, BA. Produção e equilíbrio ambiental: anais. Cruz Das Almas, BA: UFRB, 2014.| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 34. | | CERDEIRA, A. L.; SANTOS, N. A. G.; UETA, J.; SHUHAMA, I. K.; PESSOA, M. C. P. Y.; SMITH JUNIOR, S.; LANCHOTE, V. L. Atrazine in water and biodegradation in a recharge area of Guarany Aquifer in Brazil. Bulletin of Environmental Contamination and Toxicology, New York, v. 73, n. 1, p. 117-124, 2004.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 36. | | CONTARINI, L. B. P.; SOARES, B. C.; RODRIGUES FILHO, J. A.; SENA, A. L. S.; LOURENÇO JUNIOR, J. B.; SANTOS, N. A. A. Perfil socioeconômico dos produtores de leite do município de Rondon do Pará, Mesorregião Sudeste Paraense. In: CONGRESSO DE ZOOTECNIA DA AMAZÔNIA, 2., 2015, Araguaína. [Anais]. Araguaína: UFT, 2015.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 37. | | SANTOS, N. A. G.; LANCHOTE, V. L.; DREOSSI, S. A. C.; GOMES, M. A. F.; CERDEIRA, A. L.; CARVALHO, D.; BONATO, P. S. GC-MS determination of chlorotriazines in aqueous environmental samples. In: CONGRESS OF PHARMACEUTICAL SCIENCES, 1., 1997, Ribeirao Preto, SP. Bolletino Chimico Farmaceutico, v.136, p.131, 1997. Abstract.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 38. | | DREOSSI, S. A. C.; LANCHOTE, V. L.; SANTOS, N. A. G.; CERDEIRA, A. L.; GOMES, M. A. F.; CARVALHO, D.; BONATO, P. S. GC-MS method for the determination of tebuthiuron in water. In: CONGRESS OF PHARMACEUTICAL SCIENCES, 1., 1997, Ribeirao Preto, SP. Bollettino Chimico Farmaceutico,v. 136, p.132, 1997. Abstract.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 39. | | VIEIRA, E. de A.; ALCÂNTARA, M. A.; SANTOS, N. A. dos; GODIM, A. D.; IACOMINI, M.; SILVA, C. M.; CORDEIRO, A. M. T. de M. Mucilages of cacti from Brazilian biodiversity: Extraction, physicochemical and technological properties. Food Chemistry, v. 346, e128892, 2021.| Biblioteca(s): Embrapa Agroindústria de Alimentos. |
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| 40. | | SANTOS, N. A. G.; BONATO, P. S.; DREOSSI, S. A. C.; GOMES, M. A. F.; CERDEIRA, A. L.; CARVALHO, D.; LANCHOTE, V. L. Multiresidue method for the analysis of herbicides in surface and groundwater. In: CONGRESS OF PHARMACEUTICAL SCIENCES, 1., 1997, Ribeirao Preto, SP. Bolletino Chimico Farmaceutico, v.136, p.133, 1997. Abstract.| Biblioteca(s): Embrapa Meio Ambiente. |
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| Registros recuperados : 56 | |
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Registro Completo
|
Biblioteca(s): |
Embrapa Meio Ambiente. |
|
Data corrente: |
21/05/1998 |
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Data da última atualização: |
03/11/2015 |
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Autoria: |
SANTOS, N. A. G.; BONATO, P. S.; DREOSSI, S. A. C.; GOMES, M. A. F.; CERDEIRA, A. L.; CARVALHO, D.; LANCHOTE, V. L. |
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Afiliação: |
USP; USP; USP; MARCO ANTONIO FERREIRA GOMES, CNPMA; ANTONIO LUIZ CERDEIRA, CNPMA; USP; USP. |
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Título: |
Multiresidue method for the analysis of herbicides in surface and groundwater. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
In: CONGRESS OF PHARMACEUTICAL SCIENCES, 1., 1997, Ribeirao Preto, SP. Bolletino Chimico Farmaceutico, v.136, p.133, 1997. Abstract. |
|
Idioma: |
Inglês |
|
Conteúdo: |
The high standards for drinking water purity laid down by the European Community, United States and other coutries require the development of suitable analytical methods with high sensitivity, selectivity, accuracy and reliability, that permit the analysis of a broad variety of substances in a single run, or at least those substances that are important in a specific water catchment area. The standard method for the investigation of environmental pollutants has been gas chromatography using different selective detectors after extraction with different organic solvents. Some of that substances that are difficult to analyze by gas chromatography because of thermal instability or chemical polarity, may be analyzed by high performance liquid chromatography. In the present study we employed this technique to develop a highly sensitive method for the simultaneous analysis of atrazine, simazine, ametryne, tebuthiuron and diuron in surface and groundwater. The aqueous samples (100 ml ) were filtered through 0.22 um membranes to remove suspended matter. After adjusting the pH by the addition of 25 uL of 4M NaOH, the samples were extracted with 12 ml dichloromethane by mechanical shaking for 1 hour. After phase separation, 6 ml of the organic phases were transferred to conic test tubes and the solvent was evaporated to dryness under a stream of nitrogen at 35oC. The residues were dissolved in 200 ul of the mobile phase and 100 ul were chromatographed on a Lichrospher 100 RP-8 column (particle 5 um , 125x4mm, Merck) using 0.05 M phosphate buffer, pH 5.5, and acetonitrile (73:27, v/v) as mobile phase. The triazine herbicides were detected at 220 nm, whereas tebuthiuron and diuron were detected at 254 nm. The recovery obtained in the extration procedure was higher than 95% for all herbicides except simazine for which the recovery was 85.6%. Due to the enrichment in the extraction procedure and the sensitive detection at two wavelengths it was possible to obtain a quantification limit of 0.02 ug/L for all herbicides studied. The method was linear over the range of 0.02 to 2.0 ug/L. The method was employed for the analysis of suface and groundwater samples collected over a period of ten months (10/95 to 07/96) in the Ribeirao Preto region. Our results show that the method was suitable for the sensitive screening of these herbicides. MenosThe high standards for drinking water purity laid down by the European Community, United States and other coutries require the development of suitable analytical methods with high sensitivity, selectivity, accuracy and reliability, that permit the analysis of a broad variety of substances in a single run, or at least those substances that are important in a specific water catchment area. The standard method for the investigation of environmental pollutants has been gas chromatography using different selective detectors after extraction with different organic solvents. Some of that substances that are difficult to analyze by gas chromatography because of thermal instability or chemical polarity, may be analyzed by high performance liquid chromatography. In the present study we employed this technique to develop a highly sensitive method for the simultaneous analysis of atrazine, simazine, ametryne, tebuthiuron and diuron in surface and groundwater. The aqueous samples (100 ml ) were filtered through 0.22 um membranes to remove suspended matter. After adjusting the pH by the addition of 25 uL of 4M NaOH, the samples were extracted with 12 ml dichloromethane by mechanical shaking for 1 hour. After phase separation, 6 ml of the organic phases were transferred to conic test tubes and the solvent was evaporated to dryness under a stream of nitrogen at 35oC. The residues were dissolved in 200 ul of the mobile phase and 100 ul were chromatographed on a Lichrospher 100 RP-8 column (p... Mostrar Tudo |
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Palavras-Chave: |
Analysis of herbicides; Multiresidue method; Surface and groundwater. |
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Categoria do assunto: |
W Química e Física |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/87151/1/1997RAs-010.PDF
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|
Marc: |
LEADER 03122naa a2200229 a 4500
001 1012895
005 2015-11-03
008 1997 bl uuuu u00u1 u #d
100 1 $aSANTOS, N. A. G.
245 $aMultiresidue method for the analysis of herbicides in surface and groundwater.$h[electronic resource]
260 $c1997
520 $aThe high standards for drinking water purity laid down by the European Community, United States and other coutries require the development of suitable analytical methods with high sensitivity, selectivity, accuracy and reliability, that permit the analysis of a broad variety of substances in a single run, or at least those substances that are important in a specific water catchment area. The standard method for the investigation of environmental pollutants has been gas chromatography using different selective detectors after extraction with different organic solvents. Some of that substances that are difficult to analyze by gas chromatography because of thermal instability or chemical polarity, may be analyzed by high performance liquid chromatography. In the present study we employed this technique to develop a highly sensitive method for the simultaneous analysis of atrazine, simazine, ametryne, tebuthiuron and diuron in surface and groundwater. The aqueous samples (100 ml ) were filtered through 0.22 um membranes to remove suspended matter. After adjusting the pH by the addition of 25 uL of 4M NaOH, the samples were extracted with 12 ml dichloromethane by mechanical shaking for 1 hour. After phase separation, 6 ml of the organic phases were transferred to conic test tubes and the solvent was evaporated to dryness under a stream of nitrogen at 35oC. The residues were dissolved in 200 ul of the mobile phase and 100 ul were chromatographed on a Lichrospher 100 RP-8 column (particle 5 um , 125x4mm, Merck) using 0.05 M phosphate buffer, pH 5.5, and acetonitrile (73:27, v/v) as mobile phase. The triazine herbicides were detected at 220 nm, whereas tebuthiuron and diuron were detected at 254 nm. The recovery obtained in the extration procedure was higher than 95% for all herbicides except simazine for which the recovery was 85.6%. Due to the enrichment in the extraction procedure and the sensitive detection at two wavelengths it was possible to obtain a quantification limit of 0.02 ug/L for all herbicides studied. The method was linear over the range of 0.02 to 2.0 ug/L. The method was employed for the analysis of suface and groundwater samples collected over a period of ten months (10/95 to 07/96) in the Ribeirao Preto region. Our results show that the method was suitable for the sensitive screening of these herbicides.
653 $aAnalysis of herbicides
653 $aMultiresidue method
653 $aSurface and groundwater
700 1 $aBONATO, P. S.
700 1 $aDREOSSI, S. A. C.
700 1 $aGOMES, M. A. F.
700 1 $aCERDEIRA, A. L.
700 1 $aCARVALHO, D.
700 1 $aLANCHOTE, V. L.
773 $tIn: CONGRESS OF PHARMACEUTICAL SCIENCES, 1., 1997, Ribeirao Preto, SP. Bolletino Chimico Farmaceutico$gv.136, p.133, 1997. Abstract.
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