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5. | | ASSIS, D. S.; GOMES, J. B. V.; TOSTO, S. G.; SILVA, T. C. da. Macrozoneamento ambiental do Município de São Gabriel do Oeste. In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 27., 1999, Brasília, DF. Resumos [...]. Planaltina, DF: Embrapa Cerrados, 1999. 1 CD-ROM. Biblioteca(s): Embrapa Solos. |
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7. | | SILVA, T. C. da; ROCHA, J. D'A. M.; MOREIRA, P.; SIGNOR, A.; BOSCOLO, W. R. Fish protein hydrolysate in diets for Nile tilapia post-larvae. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 52, n. 7, p. 485-492, jul. 2017. Título em português: Hidrolisado proteico de peixe em dietas para pós-larvas de tilápia-do-nilo. Biblioteca(s): Embrapa Unidades Centrais. |
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12. | | SILVA, T. C. da; GARCIA, J. da S.; LIMA, J. de F. Relação peso-comprimento do camarão pitú, Macrobrachium carcinus (Crustacea, Decapoda, Palaemonidae) na foz do rio Amazonas. In: AQUACIÊNCIA, 2010, Recife. Anais... Recife: AQUABIO, UFRPE, 2010. Resumo simples. Biblioteca(s): Embrapa Amapá. |
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15. | | DAMASCENO, G. C. C.; SILVA, T. C. da; TORRIS, A. F.; COSTA, V. A.; COSTA-LIMA, T. C. da. Influência da temperatura na biologia do parasitoide de mosca-minadora, Neochrysocharis formosa (Hymenoptera: Eulophidae). In: JORNADA DE INICIAÇÃO CIENTÍFICA DA EMBRAPA SEMIÁRIDO, 13., 2018, Petrolina. Anais... Petrolina: Embrapa Semiárido, 2018. p. 177-181. (Embrapa Semiárido. Documentos, 283). Biblioteca(s): Embrapa Semiárido. |
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17. | | GARCIA, J. da S.; APARICIO, G. K. da S.; SILVA, T. C. da; LIMA, J. de F. Dieta natural de Armases benedicti Rathbun, 1897 (Brachyura, Sersamidae) na foz do Rio Amazonas. In: CONGRESSO BRASILEIRO SOBRE CRUSTÁCEOS, 5., 2008, Gramado. Programa e resumos... Porto Alegre: Pallotti, 2008. p. 50. Biblioteca(s): Embrapa Amapá. |
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18. | | DAMASCENO, G. C. C.; SILVA, T. C. da; TORRIS, A. F.; COSTA, V. A.; COSTA-LIMA, T. C. da. Parasitoide de mosca-minadora com linhagem telítoca tolerante a altas temperaturas. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 27.; CONGRESSO LATINO-AMERICANO DE ENTOMOLOGIA, 10., 2018, Gramado, RS. Saúde, ambiente e agricultura: anais. Gramado: SEB, 2018. p. 204. Biblioteca(s): Embrapa Semiárido. |
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20. | | DAMASCENO, G. C. C.; SILVA, T. C. da; TIRRIS, A. F.; BERNARDI, O.; COSTA-LIMA, T. C. da. Suscetibilidade de populações de Liriomyza sativae (Diptera: Agromyzidae) oriundas de meloeiro à abamectina. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 27.; CONGRESSO LATINO-AMERICANO DE ENTOMOLOGIA, 10., 2018, Gramado, RS. Saúde, ambiente e agricultura: anais. Gramado: SEB, 2018. p. 1379. Biblioteca(s): Embrapa Semiárido. |
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Registro Completo
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
Data corrente: |
07/07/2021 |
Data da última atualização: |
28/09/2021 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
SÁ, I. P. de; SOUZA, G. B. de; NOGUEIRA, A. R. de A. |
Afiliação: |
IVERO PITA DE SÁ, UFSCAR; GILBERTO BATISTA DE SOUZA, CPPSE; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
Título: |
Chromium speciation in organic fertilizer by cloud point extraction and optimization through experimental Doehlert design as support for legislative aspects. |
Ano de publicação: |
2021 |
Fonte/Imprenta: |
Microchemical Journal, v.160, part A, jan. 2021, 105618. |
Páginas: |
6 p. |
ISSN: |
0026-265X |
DOI: |
https://doi.org/10.1016/j.microc.2020.105618 |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Cloud point extraction; Cr(VI); Flame atomic absorption spectrometry; Spectrophotometry. |
Thesaurus NAL: |
Experimental design; Organic fertilizers. |
Categoria do assunto: |
W Química e Física |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/224325/1/Chromium-Speciation-Organic.pdf
|
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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