title: In-line electrochemical reagent generation coupled to a flow injection biamperometric system for the determination of sulfite in beverage samples.
abstract: 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.
authors.affiliation: Departamento de Química, Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Nattany T G
authors.initials: NTG
authors.lastname: de Paula
authors.affiliation: Departamento de Química, Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Elaine M O
authors.initials: EMO
authors.lastname: Barbosa
authors.affiliation: Departamento de Química Fundamental, Universidade Federal de Pernambuco, Av. Jornalista Aníbal Fernandes, s/n, Cidade Universitária, 50740-560 Recife, PE, Brazil; Instituto Federal de Alagoas, Campus Coruripe, 57035-000 Maceió, AL, Brazil.
authors.forename: Paulo A B
authors.initials: PAB
authors.lastname: da Silva
authors.affiliation: Departamento de Química, Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil; Departamento de Química Fundamental, Universidade Federal de Pernambuco, Av. Jornalista Aníbal Fernandes, s/n, Cidade Universitária, 50740-560 Recife, PE, Brazil.
authors.forename: Gustavo C S
authors.initials: GCS
authors.lastname: de Souza
authors.affiliation: Departamento de Química, Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.
authors.forename: Valberes B
authors.initials: VB
authors.lastname: Nascimento
authors.affiliation: Departamento de Química, Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil. Electronic address: andre.lavorante@ufrpe.br.
authors.forename: André F
authors.initials: AF
authors.lastname: Lavorante
mesh_terms: D001628:Beverages / Q000032:analysis* / Q000592:standards; D055664:Electrochemical Techniques / Q000379:methods*; D017022:Flow Injection Analysis / Q000379:methods; D005503:Food Additives / Q000032:analysis*; D000067030:Fruit and Vegetable Juices / Q000032:analysis / Q000592:standards; D007202:Indicators and Reagents; D007454:Iodides / Q000737:chemistry*; D057230:Limit of Detection; D010084:Oxidation-Reduction; D012015:Reference Standards; D012996:Solutions; D013447:Sulfites / Q000032:analysis*; D014920:Wine / Q000032:analysis / Q000592:standards
chemical_list: D005503:Food Additives; D007202:Indicators and Reagents; D007454:Iodides; D012996:Solutions; D013447:Sulfites
keywords: Beverage; Biamperometry; Electrochemical reagent generation; Flow injection analysis; Sulfite