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Food Chem ; 203: 183-189, 2016 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-26948604

RESUMO

This work reports an in-line electrochemical reagent generation coupled to a flow injection biamperometric procedure for the determination of SO3(2-). The method was based on a redox reaction between the I3(-) and SO3(2-) ions, after the diffusion of SO2 through a gas diffusion chamber. Under optimum experimental conditions, a linear response ranging from 1.0 to 12.0 mg L(-1) (R=0.9999 and n=7), a detection and quantification limit estimated at 0.26 and 0.86 mg L(-1), respectively, a standard deviation relative of 0.4% (n=10) for a reference solution of 4.0 mg L(-1) SO3(2-) and sampling throughput for 40 determinations per hour were achieved. Addition and recovery tests with juice and wine samples were performed resulting in a range between 92% and 110%. There were no significant differences at a 95% confidence level in the analysis of eight samples when comparing the new method with a reference procedure.


Assuntos
Bebidas/análise , Técnicas Eletroquímicas/métodos , Aditivos Alimentares/análise , Iodetos/química , Sulfitos/análise , Bebidas/normas , Análise de Injeção de Fluxo/métodos , Sucos de Frutas e Vegetais/análise , Sucos de Frutas e Vegetais/normas , Indicadores e Reagentes , Limite de Detecção , Oxirredução , Padrões de Referência , Soluções , Vinho/análise , Vinho/normas
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