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In-line electrochemical reagent generation coupled to a flow injection biamperometric system for the determination of sulfite in beverage samples

2016; Elsevier BV; Volume: 203; Linguagem: Inglês

10.1016/j.foodchem.2016.01.125

1873-7072

Nattany Tayany Gomes de Paula, Elaine M.O. Barbosa, Paulo A.B. da Silva, Gustavo C. S. de Souza, Valberes B. Nascimento, André F. Lavorante,

Electrochemical sensors and biosensors

This work reports an in-line electrochemical reagent generation coupled to a flow injection biamperometric procedure for the determination of SO32−. The method was based on a redox reaction between the I3− and SO32− 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 SO32− 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.