Direct introduction of slurry samples in multi-syringe flow injection analysis: Determination of potassium in plant samples

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Ines I G S Almeida (Autor) Outra; Marcela A Segundo (Autor) FFUP; Jose L F C Lima (Autor) FFUP; Antonio O S S Rangel (Autor) Outra

Revista

Título: Analytical Sciences

Vol. 24 Nº 10

Páginas: 601-606

ISSN: 0910-6340

Editora: Japan Society for Analytical Chemistry

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 4 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-003-ZGK

DOI: 10.2116/analsci.24.601

Resumo (PT): 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 g-1. A determination frequency of 28 h-1 was achieved and the precision was better than 4.0% (n = 12). <br> <br> <a target="_blank" href="http://www.jstage.jst.go.jp/article/analsci/24/5/24_601/_article"> Texto integral </a> <br> <br>

Abstract (EN): 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 g(-1). A determination frequency of 28 h(-1) was achieved and the precision was better than 4.0% (n = 12).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6