Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/2776
Título: Direct introduction of slurry samples in multi-syringe flow injection analysis: Determination of potassium in plant samples
Autor: Almeida, M. Inês G. S.
Segndo, Marcela A.
Lima, José L. F. C.
Rangel, António O. S. S.
Data: 2008
Editora: The Japan Society for Analytical Chemistry
Citação: "Analytical Sciences" . ISSN 0910-6340. 24: 5 (2008) 601-606
Resumo: The present work explores the slurry sampling approach for automatic, flow-based plant analysis. For this purpose, pinch valves were introduced into a multi-syringe flow injection analysis manifold to provide the repeatable aspiration of a few microliters of plant suspension before the material was further processed through the flow system. For validation of the proposed approach, the determination of potassium by flame emission spectrometry was implemented. Several parameters were studied: the concentration of plant particles in the sample suspension and the utilization of matrix modifiers. Microwave digestion was also implemented; no significant difference was found when certified reference material was analyzed with or without the in-line digestion step. The system was successfully applied to 13 samples within a concentration range of 2.5 to 100 mg gˉ¹. A determination frequency of 28 hˉ¹ was achieved and the precision was better than 4.0% (n = 12).
URI: http://hdl.handle.net/10400.14/2776
Versão do Editor: http://www.jsac.or.jp/cgi-bin/analsci/abst/24/5/601/
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review



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