Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6765
Título: Sequential injection determination of nitrate in vegetables by spectrophotometry with inline cadmium reduction
Autor: Oliveira, Sara M.
Lopes, Teresa I. M. S.
Rangel, António O. S. S.
Palavras-chave: Copperized cadmium column
Sequential injection analysis
Data: 2007
Editora: Taylor & Francis Group
Citação: "Communications in soil science and plant analysis". ISSN 0010-3624. 38: 3-4 (2007) 533-544
Resumo: A sequential injection system for the determination of nitrate (NO3 2) in vegetables was developed to automate this determination, allowing for substantially reduced reagent consumption and generated waste using low-cost equipment. After extraction with water and filtration, the extracted nitrate is reduced inline to nitrite in a copperized cadmium (Cd) column and determined as nitrite. According to the Griess–Ilosvay reaction, nitrate is diazotized with sulfanilamide and coupled with N-(1-naphtyl)-ethylenediamine dihydrochloride to form a purple-red azo dye monitored at 538 nm. Nitrate can be determined within a range of 1.35–50.0 mg L21 of NO3 2 (corresponding to 0.270–10.0 g of NO3 2 per kg of vegetable), with a conversion rate of nitrate to nitrite of 99.1+0.8%. The results obtained for 15 vegetable extracts compare well with those provided by the classical procedure, with a sampling throughput of 24 determinations per hour and relative standard deviations better than 1.2%.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6765
Versão do Editor: http://www.tandfonline.com/doi/abs/10.1080/00103620601174635#preview
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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