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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
11/04/2018 |
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Data da última atualização: |
14/05/2018 |
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Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
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Autoria: |
QUEIROZ, S. C. do N. de; SOUZA, D. R. C. de; CERDEIRA, A. L.; PARAIBA, L. C. |
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Afiliação: |
SONIA CLAUDIA DO N DE QUEIROZ, CNPMA; DEBORA RENATA CASSOLI DE S DUTRA, CNPMA; ANTONIO LUIZ CERDEIRA, CNPMA; LOURIVAL COSTA PARAIBA, CNPMA. |
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Título: |
Validação de um método para determinação de resíduos de fungicidas em grãos de soja. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Jaguariúna: Embrapa Meio Ambiente, 2017. |
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Páginas: |
19 p. |
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Série: |
(Embrapa Meio Ambiente. Boletim de Pesquisa e Desenvolvimento, 73). |
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ISSN: |
1516-4675 |
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Idioma: |
Português |
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Conteúdo: |
O cultivo de soja utiliza diversos tipos de fungicidas para controlar fungos fitopatogênicos, que, dependendo das características físico-químicas das moléculas, podem se acumular nos grãos e causar riscos à saúde humana. Desse modo, para verificar a presença de resíduos destas substâncias nesta matriz alimentar há necessidade de desenvolver e validar métodos analíticos que sejam sensíveis e confiáveis. Assim, o objetivo deste trabalho foi adaptar e validar um método para a determinação dos fungicidas não-iônicos ciproconazol, epoxiconazol, piraclostrobina e azoxistrobina em grãos de soja, para ser aplicado na validação de um modelo matemático cinético de bioconcentração, a fim de prever o acúmulo desses agrotóxicos nesse alimento. O método analítico baseou-se na abordagem QuEChERS (do inglês Quick, Easy, Cheap, Effective, Rugged and Safe) - acetato para o preparo de amostra e para a quantificação e confirmação da técnica de cromatografia gasosa acoplada à espectrometria de massas (GC-MS/MS). Os parâmetros de validação avaliados foram: linearidade maior ou igual a 0,99, exatidão (em termos % de recuperação) de 70-120 % e precisão menor ou igual a 20 % (em termos de repetitividade na forma de coeficiente de variação-CV%), limites de quantificação (LQ) iguais a 10 micrograma kg-1 para ciproconazol, 5 micrograma kg-1 para epoxiconazol e azoxistrobina, e 100 micrograma kg-1para piraclostrobina. Portanto, o método foi adequado para o uso pretendido. //// Phytopathogenic diseases in soybean are controlled with several types of fungicides, which, depending on the physico-chemical characteristics of the molecules, they can accumulate in grains and cause risks to human health. Thus, to verify the presence of residues of these substances there is a need to develop and validate analytical methods that are sensitive and reliable. The objective of this study was to adapt and validate a method for the determination of non-ionic fungicides such as cyproconazole, epoxiconazole, pyraclostrobin and azoxystrobin in soybeans, to be used to validate a model of kinetic bioconcentration in order to predict the accumulation of the pesticides in this food. The analytical method was based on QuEChERS approach (English Quick, Easy, Cheap, Effective, Rugged and Safe)-acetate for sample preparation, quantification and confirmation with gas chromatography coupled to mass spectrometry (GC-MS/MS). The validation parameters evaluated were: linearity greater than or equal to 0.99, accuracy (in terms of % recovery) of 70-120% and precision less than or equal to 20% (in terms of repeatability as coefficient of variation), quantification limits (QL) equal to 10 microgram kg-1 for cyproconazole, 5 microgram kg-1 for epoxiconazole and azoxystrobin and 100 micrograma kg-1 for pyraclostrobin. Thus, the method was suitable for the intended use. MenosO cultivo de soja utiliza diversos tipos de fungicidas para controlar fungos fitopatogênicos, que, dependendo das características físico-químicas das moléculas, podem se acumular nos grãos e causar riscos à saúde humana. Desse modo, para verificar a presença de resíduos destas substâncias nesta matriz alimentar há necessidade de desenvolver e validar métodos analíticos que sejam sensíveis e confiáveis. Assim, o objetivo deste trabalho foi adaptar e validar um método para a determinação dos fungicidas não-iônicos ciproconazol, epoxiconazol, piraclostrobina e azoxistrobina em grãos de soja, para ser aplicado na validação de um modelo matemático cinético de bioconcentração, a fim de prever o acúmulo desses agrotóxicos nesse alimento. O método analítico baseou-se na abordagem QuEChERS (do inglês Quick, Easy, Cheap, Effective, Rugged and Safe) - acetato para o preparo de amostra e para a quantificação e confirmação da técnica de cromatografia gasosa acoplada à espectrometria de massas (GC-MS/MS). Os parâmetros de validação avaliados foram: linearidade maior ou igual a 0,99, exatidão (em termos % de recuperação) de 70-120 % e precisão menor ou igual a 20 % (em termos de repetitividade na forma de coeficiente de variação-CV%), limites de quantificação (LQ) iguais a 10 micrograma kg-1 para ciproconazol, 5 micrograma kg-1 para epoxiconazol e azoxistrobina, e 100 micrograma kg-1para piraclostrobina. Portanto, o método foi adequado para o uso pretendido. //// Phytopathogenic diseases i... Mostrar Tudo |
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Palavras-Chave: |
Mass spectroscopy; Soybean. |
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Thesagro: |
Análise química; Cromatografia gasosa; Fungicida; Resíduo químico; Soja. |
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Thesaurus Nal: |
Chemical analysis; Chemical residues; Chromatography; Fungicides. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/175429/1/2017BP04.pdf
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Marc: |
LEADER 03837nam a2200313 a 4500
001 2090496
005 2018-05-14
008 2017 bl uuuu u0uu1 u #d
022 $a1516-4675
100 1 $aQUEIROZ, S. C. do N. de
245 $aValidação de um método para determinação de resíduos de fungicidas em grãos de soja.$h[electronic resource]
260 $aJaguariúna: Embrapa Meio Ambiente$c2017
300 $a19 p.
490 $a(Embrapa Meio Ambiente. Boletim de Pesquisa e Desenvolvimento, 73).
520 $aO cultivo de soja utiliza diversos tipos de fungicidas para controlar fungos fitopatogênicos, que, dependendo das características físico-químicas das moléculas, podem se acumular nos grãos e causar riscos à saúde humana. Desse modo, para verificar a presença de resíduos destas substâncias nesta matriz alimentar há necessidade de desenvolver e validar métodos analíticos que sejam sensíveis e confiáveis. Assim, o objetivo deste trabalho foi adaptar e validar um método para a determinação dos fungicidas não-iônicos ciproconazol, epoxiconazol, piraclostrobina e azoxistrobina em grãos de soja, para ser aplicado na validação de um modelo matemático cinético de bioconcentração, a fim de prever o acúmulo desses agrotóxicos nesse alimento. O método analítico baseou-se na abordagem QuEChERS (do inglês Quick, Easy, Cheap, Effective, Rugged and Safe) - acetato para o preparo de amostra e para a quantificação e confirmação da técnica de cromatografia gasosa acoplada à espectrometria de massas (GC-MS/MS). Os parâmetros de validação avaliados foram: linearidade maior ou igual a 0,99, exatidão (em termos % de recuperação) de 70-120 % e precisão menor ou igual a 20 % (em termos de repetitividade na forma de coeficiente de variação-CV%), limites de quantificação (LQ) iguais a 10 micrograma kg-1 para ciproconazol, 5 micrograma kg-1 para epoxiconazol e azoxistrobina, e 100 micrograma kg-1para piraclostrobina. Portanto, o método foi adequado para o uso pretendido. //// Phytopathogenic diseases in soybean are controlled with several types of fungicides, which, depending on the physico-chemical characteristics of the molecules, they can accumulate in grains and cause risks to human health. Thus, to verify the presence of residues of these substances there is a need to develop and validate analytical methods that are sensitive and reliable. The objective of this study was to adapt and validate a method for the determination of non-ionic fungicides such as cyproconazole, epoxiconazole, pyraclostrobin and azoxystrobin in soybeans, to be used to validate a model of kinetic bioconcentration in order to predict the accumulation of the pesticides in this food. The analytical method was based on QuEChERS approach (English Quick, Easy, Cheap, Effective, Rugged and Safe)-acetate for sample preparation, quantification and confirmation with gas chromatography coupled to mass spectrometry (GC-MS/MS). The validation parameters evaluated were: linearity greater than or equal to 0.99, accuracy (in terms of % recovery) of 70-120% and precision less than or equal to 20% (in terms of repeatability as coefficient of variation), quantification limits (QL) equal to 10 microgram kg-1 for cyproconazole, 5 microgram kg-1 for epoxiconazole and azoxystrobin and 100 micrograma kg-1 for pyraclostrobin. Thus, the method was suitable for the intended use.
650 $aChemical analysis
650 $aChemical residues
650 $aChromatography
650 $aFungicides
650 $aAnálise química
650 $aCromatografia gasosa
650 $aFungicida
650 $aResíduo químico
650 $aSoja
653 $aMass spectroscopy
653 $aSoybean
700 1 $aSOUZA, D. R. C. de
700 1 $aCERDEIRA, A. L.
700 1 $aPARAIBA, L. C.
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
05/01/2017 |
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Data da última atualização: |
08/10/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
ARAUJO, J. K. S.; SOUZA JÚNIOR, V. S. de; MARQUES, F. A.; VORONEY, P.; SOUZA, R. A. da S. |
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Afiliação: |
JANE KELLY SILVA ARAUJO, UFRPE; VALDOMIRO SEVERINO DE SOUZA JÚNIOR, UFRPE; FLAVIO ADRIANO MARQUES, CNPS; PAUL VORONEY, School of Environmental Sciences, University of Guelph; REGILENE ANGELICA DA SILVA SOUZA, UFRA. |
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Título: |
Assessment of carbon storage under rainforests in Humic Hapludox along a climosequence extending from the Atlantic coast to the highlands of northeastern Brazil. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Science of The Total Environment, v. 568, p. 339-349, Oct. 2016. |
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DOI: |
https://doi.org/10.1016/j.scitotenv.2016.06.025 |
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Idioma: |
Inglês |
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Conteúdo: |
An understanding of the stock of soil organic carbon (SOC) in the umbric epipedon of Oxisols located in the tropical forests surrounded by a semi-arid region is limited but essential because of their importance in the global cycle of carbon (C). The purpose of this study was to assess the effects of climatic (temperature and rainfall), soil organic matter (SOM) composition and litter on the stability of C in surfaces and subsurfaces in five Humic Oxisols along a 475-km climo sequence from 143 to 963m a.s.l. in a tropical environment in northeastern Brazil. Weassessed vertical changes in SOC; soil total nitrogen (N); C from the microbial biomass; 13C, 15N and the humified composition of SOM; the composition of the humin (HUM) fraction by Fourier Transform Infrared (FTIR); and Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) at depth. The elemental and isotopic composition of the litter samples were analyzed in all areas studied. The results indicated that the current climate and recalcitrant organic compounds are not preponderant factors in the formation of the umbric epipedon, as suggested by the partial influence of temperature and rainfall on SOM. In addition, SOM was dominated by easily decomposable compounds, as indicated by the predominance of aliphatic C-H groups in the HUM fraction in the FTIR spectra; by the thermal oxidation through DSC-TG, which revealed that approximately 50% of the HUM was composed easily decomposable compounds; and by the high proportion of organic C present in the microbial biomass. Values of 13C showed a predominance of C3 plant-C in SOM where as 15N patterns indicated that N dynamics differ among the profiles and drive the accumulation of C. These findings can help to characterize the susceptibility of these soils to changes in climate and land use and the implications for the sequestration of soil C. MenosAn understanding of the stock of soil organic carbon (SOC) in the umbric epipedon of Oxisols located in the tropical forests surrounded by a semi-arid region is limited but essential because of their importance in the global cycle of carbon (C). The purpose of this study was to assess the effects of climatic (temperature and rainfall), soil organic matter (SOM) composition and litter on the stability of C in surfaces and subsurfaces in five Humic Oxisols along a 475-km climo sequence from 143 to 963m a.s.l. in a tropical environment in northeastern Brazil. Weassessed vertical changes in SOC; soil total nitrogen (N); C from the microbial biomass; 13C, 15N and the humified composition of SOM; the composition of the humin (HUM) fraction by Fourier Transform Infrared (FTIR); and Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) at depth. The elemental and isotopic composition of the litter samples were analyzed in all areas studied. The results indicated that the current climate and recalcitrant organic compounds are not preponderant factors in the formation of the umbric epipedon, as suggested by the partial influence of temperature and rainfall on SOM. In addition, SOM was dominated by easily decomposable compounds, as indicated by the predominance of aliphatic C-H groups in the HUM fraction in the FTIR spectra; by the thermal oxidation through DSC-TG, which revealed that approximately 50% of the HUM was composed easily decomposable compounds; and by the high p... Mostrar Tudo |
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Palavras-Chave: |
Biomassa microbiana; Carbono profundo; FTIR; Lixo; Nitrogênio do solo; Semiárido. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02734naa a2200253 a 4500
001 2059966
005 2021-10-08
008 2016 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.scitotenv.2016.06.025$2DOI
100 1 $aARAUJO, J. K. S.
245 $aAssessment of carbon storage under rainforests in Humic Hapludox along a climosequence extending from the Atlantic coast to the highlands of northeastern Brazil.$h[electronic resource]
260 $c2016
520 $aAn understanding of the stock of soil organic carbon (SOC) in the umbric epipedon of Oxisols located in the tropical forests surrounded by a semi-arid region is limited but essential because of their importance in the global cycle of carbon (C). The purpose of this study was to assess the effects of climatic (temperature and rainfall), soil organic matter (SOM) composition and litter on the stability of C in surfaces and subsurfaces in five Humic Oxisols along a 475-km climo sequence from 143 to 963m a.s.l. in a tropical environment in northeastern Brazil. Weassessed vertical changes in SOC; soil total nitrogen (N); C from the microbial biomass; 13C, 15N and the humified composition of SOM; the composition of the humin (HUM) fraction by Fourier Transform Infrared (FTIR); and Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC) at depth. The elemental and isotopic composition of the litter samples were analyzed in all areas studied. The results indicated that the current climate and recalcitrant organic compounds are not preponderant factors in the formation of the umbric epipedon, as suggested by the partial influence of temperature and rainfall on SOM. In addition, SOM was dominated by easily decomposable compounds, as indicated by the predominance of aliphatic C-H groups in the HUM fraction in the FTIR spectra; by the thermal oxidation through DSC-TG, which revealed that approximately 50% of the HUM was composed easily decomposable compounds; and by the high proportion of organic C present in the microbial biomass. Values of 13C showed a predominance of C3 plant-C in SOM where as 15N patterns indicated that N dynamics differ among the profiles and drive the accumulation of C. These findings can help to characterize the susceptibility of these soils to changes in climate and land use and the implications for the sequestration of soil C.
653 $aBiomassa microbiana
653 $aCarbono profundo
653 $aFTIR
653 $aLixo
653 $aNitrogênio do solo
653 $aSemiárido
700 1 $aSOUZA JÚNIOR, V. S. de
700 1 $aMARQUES, F. A.
700 1 $aVORONEY, P.
700 1 $aSOUZA, R. A. da S.
773 $tScience of The Total Environment$gv. 568, p. 339-349, Oct. 2016.
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