Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6771
Título: Determination of aluminum (III) in crystallized fruit samples using a multicommutated flow system
Autor: Tóth, Ildikó V.
Rangel, António O. S. S.
Santos, João L. M.
Lima, José L. F. C.
Palavras-chave: Multicommutation
Zone sampling
Aluminum(III)
Crystallized fruits
Spectrophotometry
Data: Jun-2004
Editora: American Chemical Society
Citação: "Journal of Agricultural and Food Chemistry" . ISSN 0021-8561. 52: 9 (2004) 2450-2454
Resumo: A multicommutated flow system was developed for the determination of aluminum in crystallized fruit samples. Spectrophotometric determination is based on the reaction of aluminum with chrome azurol S. The binary sampling technique was implemented to improve mixing conditions and to minimize reagent consumption. Three different working zones were established (0.5-5.0, 5.0-25.0, and 10.0-100 ppm) using the zone sampling approach, allowing us to adapt the extent of the in-line dilution. The influence of the chemical and physical parameters on the performance of the system was studied. Detection limits of 0.1, 0.6, and 0.8 ppm were obtained for the lowest, the medium, and the highest dispersion system, respectively. The procedure was applied to the determination of aluminum in crystallized fruit extracts. The results were in agreement with those obtained by the reference flame atomic absorption procedure at a 95% confidence level. Repeatability (RSD) was better than 2.4% in all of the three application zones.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6771
Versão do Editor: http://pubs.acs.org/doi/abs/10.1021/jf049812v
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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