Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6639
Título: Turbidimetric flow-injection determination of total nitrogen and potassium in vegetables
Autor: Lima, José L.F.C.
Rangel, António O.S.S.
Souto, M.Renata S.
Zagatto, Elias A. G.
Palavras-chave: Flow-injection
Turbidimetric sequential determination
Nitrogen
Potassium
Vegetables
Data: 1997
Editora: Elsevier
Citação: LIMA, José L.F.C... [et al.] - Turbidimetric flow-injection determination of total nitrogen and potassium in vegetables. Analytica Chimica Acta. ISSN 0003-2670. Vol. 356, n.º 2-3 (1997), p. 259-265
Resumo: A turbidimetric flow-injection system was developed for the determination of total nitrogen and potassium in vegetable samples using a single spectrophotometer as detector. As a precipitating agent, 3.0% (w/v) sodium tetraphenylboron solution prepared in 2.0% (w/v) poly(vinyl alcohol) was used. A gas diffusion process was included in the manifold to separate ammonium ions from the rest of the sample and to allow paired analysis. Total nitrogen and potassium determinations were carried out on the solutions remaining in the acceptor and donor streams, respectively. Results obtained were precise (relative standard deviations <2.1 and 1.6% for total N (<25 mg g−1) and K (<55 mg g−1) determinations, respectively) and in agreement with those of reference methods. Analysis can be carried out at a rate of up to 35 samples per hour (corresponding to 70 determinations per hour) within concentration range 87–430 mg N–NH+4 l−1 and 78–390 mg K+ l−1 for the total nitrogen and potassium determinations, respectively.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6639
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0003267097005552
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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