| Chromium speciation and preconcentration using zirconium(IV) and zirconium(IV) phosphate chemically immobilized onto silica gel surface using a flow system and F AAS. | |
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MedLine Citation:
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PMID: 18969832 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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A procedure for chromium speciation by F AAS using a flow system has been proposed. In this system, Cr(III) and Cr(VI) ions were adsorbed sequentially onto a mini-column packed with silica gel modified with zirconium phosphate and a mini-column packed with silica gel modified with zirconium oxide, respectively. The elution of Cr(III) and Cr(VI) was made with, respectively, nitric acid solution and tris(hydroxymethyl)methylamine (THAM) solution in reverse mode and determination by flame atomic absorption spectrometry without interference of the matrix. Chemical and flow variables as well as concomitant ions were studied in the developed procedure. The enrichment factor for Cr(III) and Cr(VI) was 20.8 and 24.9, respectively, using a preconcentration time of 3.75min. The limit of detection for Cr(III) and Cr(VI) was 1.9, and 2.3mugl(-1), respectively. The precision of the method, evaluated as the relative standard deviation in solutions containing 100mugl(-1) of chromium species, by analyzing a series of seven replicates, was lower than 3.0%. The accuracy was assessed through recovery experiments of water samples and using another methodology. |
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Authors:
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Heloisa França Maltez; Eduardo Carasek |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Talanta Volume: 65 ISSN: 1873-3573 ISO Abbreviation: Talanta Publication Date: 2005 Jan |
Date Detail:
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Created Date: 2008-10-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2984816R Medline TA: Talanta Country: England |
Other Details:
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Languages: eng Pagination: 537-42 Citation Subset: - |
Affiliation:
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Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis 88040900, SC, Brazil. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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