Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1132824
Registro completo de metadados
Campo DCValorIdioma
dc.contributor.authorSÁ, I. P. de
dc.contributor.authorSOUZA, G. B. de
dc.contributor.authorNOGUEIRA, A. R. de A.
dc.date.accessioned2021-09-29T12:02:28Z-
dc.date.available2021-09-29T12:02:28Z-
dc.date.created2021-07-07
dc.date.issued2021
dc.identifier.citationMicrochemical Journal, v.160, part A, jan. 2021, 105618.
dc.identifier.issn0026-265X
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1132824-
dc.descriptionBrazilian 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.
dc.language.isoeng
dc.rightsopenAccesseng
dc.subjectCr(VI)
dc.subjectCloud point extraction
dc.subjectSpectrophotometry
dc.subjectFlame atomic absorption spectrometry
dc.titleChromium speciation in organic fertilizer by cloud point extraction and optimization through experimental Doehlert design as support for legislative aspects.
dc.typeArtigo de periódico
dc.subject.nalthesaurusOrganic fertilizers
dc.subject.nalthesaurusExperimental design
dc.format.extent26 p.
riaa.ainfo.id1132824
riaa.ainfo.lastupdate2021-09-28
dc.identifier.doihttps://doi.org/10.1016/j.microc.2020.105618
dc.contributor.institutionIVERO PITA DE SÁ, UFSCAR; GILBERTO BATISTA DE SOUZA, CPPSE; ANA RITA DE ARAUJO NOGUEIRA, CPPSE.
Aparece nas coleções:Artigo em periódico indexado (CPPSE)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
Chromium-Speciation-Organic.pdf1.98 MBAdobe PDFThumbnail
Visualizar/Abrir
Mostrar registro simples do item Visualizar estatísticas

FacebookTwitterDeliciousLinkedInGoogle BookmarksMySpace