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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/8022
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dc.contributor.authorFerreira, Sergio Luis Costa-
dc.contributor.authorJesus, Djane Santiago de-
dc.contributor.authorCassella, Ricardo Jorgensen-
dc.contributor.authorCosta, Antonio Celso Spinola-
dc.contributor.authorCarvalho, Marcelo Souza de-
dc.contributor.authorSantelli, Ricardo Erthal-
dc.creatorFerreira, Sergio Luis Costa-
dc.creatorJesus, Djane Santiago de-
dc.creatorCassella, Ricardo Jorgensen-
dc.creatorCosta, Antonio Celso Spinola-
dc.creatorCarvalho, Marcelo Souza de-
dc.creatorSantelli, Ricardo Erthal-
dc.date.accessioned2013-01-22T12:40:17Z-
dc.date.issued1999-
dc.identifier.issn0003-2670-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ri/8022-
dc.descriptionTexto completo: acesso restrito. p.287–292pt_BR
dc.description.abstractThe present paper describes the use of a solid phase extraction system using a polyurethane foam (PUF) minicolumn, in order to separate nickel from interferences due to other elements and determine it by flow injection analysis with spectrophotometric detection. Separation is based on the retention of thiocyanate complexes of interferent ions in the PUF minicolumn. Nickel does not form complex with thiocyanate and pass through the minicolumn and then it can be determined by using 4-(2-pyridylazo)-resorcinol (PAR) as chromogenic reagent. So, parameters such as thiocyanate concentration and pH effects on the separation efficiency, sorption capacity of the polyurethane foam minicolumn, influence of the flow rates, PAR concentration, pH effect on the chromogenic reaction, minicolumn regeneration, analytical features and others were investigated. The results demonstrated that nickel (at concentration of 0.5 mg/ml) can be quantitatively separated from iron and copper (200 mg/ml), zinc and cobalt (100 mg/ml) by using a minicolumn containing 0.125 g of polyurethane foam. Nickel can be determined with great selectivity and sensitivity and the procedure was applied for nickel determination in brass, bronze, steel and rock certified reference materials. The results showed satisfactory accuracy and precision. The limit of detection was 77 ng/ml and the RSD was 2.63%. A dynamic range from 0.25 up to 5.00 μg/ml and a sample throughput of 24 samples per hour were achieved.pt_BR
dc.language.isoenpt_BR
dc.sourcehttp://dx.doi.org/10.1016/S0003-2670(98)00596-0pt_BR
dc.subjectPolyurethane foampt_BR
dc.subjectSeparationpt_BR
dc.subjectNickel determinationpt_BR
dc.subjectContinuous flow analysispt_BR
dc.subjectCopper-base alloyspt_BR
dc.titleAn on-line solid phase extraction system using polyurethane foam for the spectrophotometric determination of nickel in silicates and alloyspt_BR
dc.title.alternativeAnalytica Chimica Actapt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 378, n. 1-3pt_BR
dc.embargo.liftdate10000-01-01-
Aparece nas coleções:Artigo Publicado em Periódico (Química)

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