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| Registros recuperados : 28 | |
| 8. |  | AMARAL, C. D. B.; AMAIS, R. S.; FIALHO, L. L.; SCHIAVO, D.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Determination of carbon in digested samples and amino acids by inductively coupled plasma tandem mass spectrometry. Microchemical Journal, v. 122, n. 1, p. 29-32, 2015.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 10. | | MACHADO, R. C.; AMARAL, C. D. B. do; NOBREGA, J. de A.; NOGUEIRA, A. R. de A. Multielemental determination of As, Bi, Ge, Sb, and Sn in agricultural samples using hydride generation coupled to microwave-induced plasma optical emission spectrometry. Journal of Agricultural and Food Chemistry, v. 65, n. 23, p. 4839-4842, 2017.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 13. | | SILVA, C. S. da; BIANCHI, S. R.; AMARAL, C. D. B. do; SOUZA, G. B. de; NOGUEIRA, A. R. de A. Estudos de homogeneidade para determinação de macro e micronutrientes em fosfatos de rocha candidato a material de referência. In: ENCONTRO NACIONAL DE METODOLOGIAS E GESTÃO DE LABORATÓRIOS, 18.; SIMPÓSIO SOBRE PROCEDIMENTOS ANALÍTICOS E AS RASTREABILIDADE DOS RESULTADOS NA AGROPECUÁRIA, 5., 2013. Salvador, Ba. Resumo... Brasília: Embrapa, MAPA, Governo Federal, 2013. 1 p.| Biblioteca(s): Embrapa Solos. |
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| 14. | | MACHADO, R. C.; VIRGILIO, A.; AMARAL, C. D. B. do; SCHIAVO, D.; NOBREGA, J. de A.; NOGUEIRA, A. R. de A. Evaluation of inductively coupled plasma tandem mass spectrometry for determination of as in agricultural inputs with high REE contents. Journal of the Brazilian Chemical Society, v. 27, n. 11, p. 2076-2081, 2016.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 16. | | BOSSU, C. M.; BERNARDI, A. C. de C.; PEREIRA, C. D.; AMARAL, C. D. B.; SOUZA, G. B. de; NOBREGA, J. A.; NOGUEIRA, A. R. de A. Avaliação da adição de contaminantes (As, Pb, Cd e Cr) em forrageira (Brachiaria brizantha) candidata a material de referência. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 16., 2011, Campos de Jordão. Anais... Campos de Jordão: SBQ, 2011.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 17. | | AMARAL, C. D. B.; PESSOA, A. G. G.; SANTOS, M. C.; DONATI, G. L.; NÓBREGA, J. A.; NOGUEIRA, A. R. de A. Avaliação de diferentes preparos de amostra para especiação de arsênio em tecido vegetal por HPLC-ICP-MS com o emprego de padronização interna com espécie poliatômica. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 16., 2011, Campos de Jordão. Anais... Campos de Jordão: SBQ, 2011.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 18. | | AMARAL, C. D. B. do; MACHADO, R. C.; VIRGILIO, A.; SCHIAVO, D.; NOGUEIRA, A. R. de A.; NOBREGA, J. de A. Critical evaluation of internal standardization in ICP tandem mass spectrometry and feasibility of the oxygen reaction for boron determination in plants. In: Journal of Analytical Atomic Spectrometry, v.31, issue 6, p. 1179-1184, 2016| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 20. | | AMARAL, C. D. B. do; MACHADO, R. C.; BARROS, J. A. V. de A.; VIRGILIO, A.; SCHIAVO, D.; NOGUEIRA, A. R. de A.; NOBREGA, J. de A. Determination of rare earth elements in geological and agricultural samples by ICP-OES. Espectroscopy, v. 32, n. 10, p. 2-6, 2017.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 28 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
11/07/2014 |
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Data da última atualização: |
29/03/2023 |
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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: |
AMARAL, C. D. B.; NOBREGA, J. A.; NOGUEIRA, A. R. de A. |
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Afiliação: |
CLARICE D. B. AMARAL, UFSCar/ APPLIES INSTRUMENTAL ANALYSIS/SÃO CARLOS, SP; JOAQUIM A. NÓBREGA, UFSCar/ APPLIES INSTRUMENTAL ANALYSIS/SÃO CARLOS, SP; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Investigation of arsenic species stability by HPLC-ICP-MS in plants stored under different conditions for 12 months. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Microchemical Journal, v. 117, p. 122-126, nov. 2014. |
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DOI: |
https://doi.org/10.1016/j.microc.2014.06.018 |
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Idioma: |
Inglês |
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Conteúdo: |
In studies of speciation, the conservation of species in their original forms is a very challenging issue, and the reliability of the results deeply depends on it. Preliminary steps of sample preparation and storage temperature may influence the conservation of species and extraction efficiency. Plant sample (Brachiaria brizantha Stapf. cv. Marandu) grown in As-containing soil was harvested and divided into four portions. The first portion was frozen-dried, milled with liquid N2 and stored at room temperature; the second portion was lyophilized and stored at 4 °C; and the remaining portions were kept at two storage temperatures (− 18 and − 80 °C) without any prior procedure. Aliquots of samples stored under different conditions were extracted every 2 months for a 12-month period. The total content of As was 2.30 ± 0.27 mg kg− 1 of dried and ground sample and As species were determined by HPLC-ICP-MS. The extraction was more efficient in sample aliquots that were lyophilized and ground (87–90%) than those only stored under different temperatures (53–66%). Furthermore, only for lyophilized and ground samples dimethylarsenic acid (DMA) was extracted. Concerning the storage time under the two tested temperatures, no significant differences on species were found and they remained stable. Standard deviations for replicates of samples that were not frozen-dried and ground were higher, and this behavior can be explained by sample heterogeneity. For the As species here studied it can be concluded that lyophilization and cryogenic grinding strategies were the most suitable sample pretreatments for As speciation in plant tissue. MenosIn studies of speciation, the conservation of species in their original forms is a very challenging issue, and the reliability of the results deeply depends on it. Preliminary steps of sample preparation and storage temperature may influence the conservation of species and extraction efficiency. Plant sample (Brachiaria brizantha Stapf. cv. Marandu) grown in As-containing soil was harvested and divided into four portions. The first portion was frozen-dried, milled with liquid N2 and stored at room temperature; the second portion was lyophilized and stored at 4 °C; and the remaining portions were kept at two storage temperatures (− 18 and − 80 °C) without any prior procedure. Aliquots of samples stored under different conditions were extracted every 2 months for a 12-month period. The total content of As was 2.30 ± 0.27 mg kg− 1 of dried and ground sample and As species were determined by HPLC-ICP-MS. The extraction was more efficient in sample aliquots that were lyophilized and ground (87–90%) than those only stored under different temperatures (53–66%). Furthermore, only for lyophilized and ground samples dimethylarsenic acid (DMA) was extracted. Concerning the storage time under the two tested temperatures, no significant differences on species were found and they remained stable. Standard deviations for replicates of samples that were not frozen-dried and ground were higher, and this behavior can be explained by sample heterogeneity. For the As species here studied it can... Mostrar Tudo |
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Palavras-Chave: |
HPLC ICP MS; Sample processing. |
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Thesaurus NAL: |
arsenic; storage. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02331naa a2200205 a 4500
001 1990421
005 2023-03-29
008 2014 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.microc.2014.06.018$2DOI
100 1 $aAMARAL, C. D. B.
245 $aInvestigation of arsenic species stability by HPLC-ICP-MS in plants stored under different conditions for 12 months.$h[electronic resource]
260 $c2014
520 $aIn studies of speciation, the conservation of species in their original forms is a very challenging issue, and the reliability of the results deeply depends on it. Preliminary steps of sample preparation and storage temperature may influence the conservation of species and extraction efficiency. Plant sample (Brachiaria brizantha Stapf. cv. Marandu) grown in As-containing soil was harvested and divided into four portions. The first portion was frozen-dried, milled with liquid N2 and stored at room temperature; the second portion was lyophilized and stored at 4 °C; and the remaining portions were kept at two storage temperatures (− 18 and − 80 °C) without any prior procedure. Aliquots of samples stored under different conditions were extracted every 2 months for a 12-month period. The total content of As was 2.30 ± 0.27 mg kg− 1 of dried and ground sample and As species were determined by HPLC-ICP-MS. The extraction was more efficient in sample aliquots that were lyophilized and ground (87–90%) than those only stored under different temperatures (53–66%). Furthermore, only for lyophilized and ground samples dimethylarsenic acid (DMA) was extracted. Concerning the storage time under the two tested temperatures, no significant differences on species were found and they remained stable. Standard deviations for replicates of samples that were not frozen-dried and ground were higher, and this behavior can be explained by sample heterogeneity. For the As species here studied it can be concluded that lyophilization and cryogenic grinding strategies were the most suitable sample pretreatments for As speciation in plant tissue.
650 $aarsenic
650 $astorage
653 $aHPLC ICP MS
653 $aSample processing
700 1 $aNOBREGA, J. A.
700 1 $aNOGUEIRA, A. R. de A.
773 $tMicrochemical Journal$gv. 117, p. 122-126, nov. 2014.
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