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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
07/07/2021 |
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Data da última atualização: |
28/09/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SÁ, I. P. de; SOUZA, G. B. de; NOGUEIRA, A. R. de A. |
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Afiliação: |
IVERO PITA DE SÁ, UFSCAR; GILBERTO BATISTA DE SOUZA, CPPSE; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Chromium speciation in organic fertilizer by cloud point extraction and optimization through experimental Doehlert design as support for legislative aspects. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Microchemical Journal, v.160, part A, jan. 2021, 105618. |
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Páginas: |
6 p. |
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ISSN: |
0026-265X |
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DOI: |
https://doi.org/10.1016/j.microc.2020.105618 |
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Idioma: |
Inglês |
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Conteúdo: |
Brazilian and EU legislation establishes 2 mg kg−1 as the maximum limit of Cr(VI) in organic fertilizers. A procedure involving chromium speciation was developed. With this approach, the interference caused by humic acid present in the samples was circumvented and met the legislation requirement. The procedure is based on the adjustment of the alkaline extraction (USEPA 3060A), and cloud point extraction (CPE) applied to determine Cr(VI) traces. The issues that directly affect Cr(VI) extraction in organic fertilizers, such as temperature, sample mass, and extractor volume were studied. Moreover, the parameters that influence CPE were evaluated using the Doehlert matrix. Under optimized conditions, the use of 0.2 g of sample and 10 mL of the extractor solution was defined. For the Cr(VI) separation and preconcentration (CPE), 2% (m v−1) NaCl, 0.3% (v v−1) Triton X-100, and 0.05% (m v−1) 1,5 diphenylcarbazide were used. UV–Vis spectrophotometry or flame atomic absorption spectrometry (FAAS) were used as detection techniques. They provided quantification limits of 1.38 and 1.82 µg g−1, respectively. The accuracy of the procedure was evaluated by analyzing certified reference materials (NIST 2701, Hexavalent Chromium in Contaminated Soil and NIST 695, Trace Elements in Multi-Nutrient Fertilizer) and analysis of spiked samples. The proposed procedure is suitable for the determination of Cr(VI) in organic fertilizers, meeting the requirements of normative instruction (NI) n. 7 (04/2016) of the Brazilian Ministry of Agriculture, Livestock and Supply and Regulation (EU) 2019/1009 of the European Parliament. MenosBrazilian and EU legislation establishes 2 mg kg−1 as the maximum limit of Cr(VI) in organic fertilizers. A procedure involving chromium speciation was developed. With this approach, the interference caused by humic acid present in the samples was circumvented and met the legislation requirement. The procedure is based on the adjustment of the alkaline extraction (USEPA 3060A), and cloud point extraction (CPE) applied to determine Cr(VI) traces. The issues that directly affect Cr(VI) extraction in organic fertilizers, such as temperature, sample mass, and extractor volume were studied. Moreover, the parameters that influence CPE were evaluated using the Doehlert matrix. Under optimized conditions, the use of 0.2 g of sample and 10 mL of the extractor solution was defined. For the Cr(VI) separation and preconcentration (CPE), 2% (m v−1) NaCl, 0.3% (v v−1) Triton X-100, and 0.05% (m v−1) 1,5 diphenylcarbazide were used. UV–Vis spectrophotometry or flame atomic absorption spectrometry (FAAS) were used as detection techniques. They provided quantification limits of 1.38 and 1.82 µg g−1, respectively. The accuracy of the procedure was evaluated by analyzing certified reference materials (NIST 2701, Hexavalent Chromium in Contaminated Soil and NIST 695, Trace Elements in Multi-Nutrient Fertilizer) and analysis of spiked samples. The proposed procedure is suitable for the determination of Cr(VI) in organic fertilizers, meeting the requirements of normative instruction (NI) n. 7 (04... Mostrar Tudo |
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Palavras-Chave: |
Cloud point extraction; Cr(VI); Flame atomic absorption spectrometry; Spectrophotometry. |
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Thesaurus Nal: |
Experimental design; Organic fertilizers. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/224325/1/Chromium-Speciation-Organic.pdf
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Marc: |
LEADER 02503naa a2200253 a 4500
001 2132824
005 2021-09-28
008 2021 bl uuuu u00u1 u #d
022 $a0026-265X
024 7 $ahttps://doi.org/10.1016/j.microc.2020.105618$2DOI
100 1 $aSÁ, I. P. de
245 $aChromium speciation in organic fertilizer by cloud point extraction and optimization through experimental Doehlert design as support for legislative aspects.$h[electronic resource]
260 $c2021
300 $a6 p.
520 $aBrazilian and EU legislation establishes 2 mg kg−1 as the maximum limit of Cr(VI) in organic fertilizers. A procedure involving chromium speciation was developed. With this approach, the interference caused by humic acid present in the samples was circumvented and met the legislation requirement. The procedure is based on the adjustment of the alkaline extraction (USEPA 3060A), and cloud point extraction (CPE) applied to determine Cr(VI) traces. The issues that directly affect Cr(VI) extraction in organic fertilizers, such as temperature, sample mass, and extractor volume were studied. Moreover, the parameters that influence CPE were evaluated using the Doehlert matrix. Under optimized conditions, the use of 0.2 g of sample and 10 mL of the extractor solution was defined. For the Cr(VI) separation and preconcentration (CPE), 2% (m v−1) NaCl, 0.3% (v v−1) Triton X-100, and 0.05% (m v−1) 1,5 diphenylcarbazide were used. UV–Vis spectrophotometry or flame atomic absorption spectrometry (FAAS) were used as detection techniques. They provided quantification limits of 1.38 and 1.82 µg g−1, respectively. The accuracy of the procedure was evaluated by analyzing certified reference materials (NIST 2701, Hexavalent Chromium in Contaminated Soil and NIST 695, Trace Elements in Multi-Nutrient Fertilizer) and analysis of spiked samples. The proposed procedure is suitable for the determination of Cr(VI) in organic fertilizers, meeting the requirements of normative instruction (NI) n. 7 (04/2016) of the Brazilian Ministry of Agriculture, Livestock and Supply and Regulation (EU) 2019/1009 of the European Parliament.
650 $aExperimental design
650 $aOrganic fertilizers
653 $aCloud point extraction
653 $aCr(VI)
653 $aFlame atomic absorption spectrometry
653 $aSpectrophotometry
700 1 $aSOUZA, G. B. de
700 1 $aNOGUEIRA, A. R. de A.
773 $tMicrochemical Journal$gv.160, part A, jan. 2021, 105618.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| Registros recuperados : 278 | |
| 61. |  | SILVA, F. V.; SOUZA, G. B. de; CRUZ, G. M. D.; NOGUEIRA, A. R. de A. Determinação potenciométrica de nitrogênio total, volátil e lignificado em amostras de silagem por injeção sequencial. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 36., 1999, Porto Alegre, RS. Anais... Porto Alegre: SBZ, 1999. p. 45.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 68. | | RABELO, M. D.; SIMEONE, M. L. F.; NOGUEIRA, A. R. de A.; SOUZA, G. B. de. Avaliação da variabilidade amostral de forrageiras in natura com NIR portátil. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 19., 2018, Caldas Novas, GO; CONGRESSO IBEROAMERICANO DE QUÍMICA ANALÍTICA, 7., Caldas Novas, GO. Anais... Caldas Novas,GO: ENQA; CIAQA, 2018. p.1134| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 70. | | MENDES, G.; FIGUEIREDO, R. A.; SOUZA, G. B. de; ALMEIDA, V. C. de; MACHADO, R. Composição em nutrientes das diferentes partes da bananeira. In: JORNADA CIENTÍFICA-EMBRAPA SÃO CARLOS, 2009, São Carlos, SP. Anais... São Carlos, SP: Embrapa Pecuária Sudeste: Embrapa Instrumentação Agropecuária, 2009. p. 116. (Embrapa Pecuária Sudeste. Documento 90).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 71. | | MENDES, G.; FIGUEIREDO, R. A.; SOUZA, G. B. de; ALMEIDA, V. C. de; MACHADO, R. Composição em nutrientes da silagem de capim furachão (Panicum repens). In: JORNADA CIENTÍFICA-EMBRAPA SÃO CARLOS, 2009, São Carlos, SP. Anais... São Carlos, SP: Embrapa Pecuária Sudeste: Embrapa Instrumentação Agropecuária, 2009. p. 117.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 72. | | BOSSU, C. M.; SOUZA, G. B. de; SILVA, P. H. T.; NOGUEIRA, A. R. de A. Ensaio de proficiência para amostra de feno de alfafa candidata a material de referência. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 15.; CONGRESSO IBEROAMERICANO DE QUÍMICA ANALÍTICA, 3., 2009, Salvador, BA. Anais... Salvador: SBQ: UFBA, 2009.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 75. | | VINHOLIS, M. de M. B.; TUPY, O.; SOUZA, G. B. de; NOGUEIRA, A. R. de A. Método alternativo de determinação de fibra em detergente ácido e fibra em detergente neutro: avaliação dos impactos da tecnologia. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E DE PROFESSORES PESQUISADORES, 4.; ENCONTRODE PESQUISADORES DA PÓS-GRADUAÇÃO, 2., 2006, Franca, SP. Anais... Franca: UNIFRAN, 2006. 7 f. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 278 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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