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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

Nattany T G de Paula, and Elaine M O Barbosa, and Paulo A B da Silva, and Gustavo C S de Souza, and Valberes B Nascimento, and André F Lavorante
Departamento de Química, Universidade Federal Rural de Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, 52171-900 Recife, PE, Brazil.

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.

UI MeSH Term Description Entries
D007202 Indicators and Reagents Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499) Indicator,Reagent,Reagents,Indicators,Reagents and Indicators
D007454 Iodides Inorganic binary compounds of iodine or the I- ion. Iodide
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D012015 Reference Standards A basis of value established for the measure of quantity, weight, extent or quality, e.g. weight standards, standard solutions, methods, techniques, and procedures used in diagnosis and therapy. Standard Preparations,Standards, Reference,Preparations, Standard,Standardization,Standards,Preparation, Standard,Reference Standard,Standard Preparation,Standard, Reference
D005503 Food Additives Substances used in the processing or storage of foods or animal feed including ANTIOXIDANTS; FOOD PRESERVATIVES; FOOD COLORING AGENTS; FLAVORING AGENTS; ANTI-INFECTIVE AGENTS; EXCIPIENTS and other similarly used substances. Many of the same substances are used as PHARMACEUTIC AIDS. Additive, Food,Additives, Food,Food Additive
D000067030 Fruit and Vegetable Juices The liquids extracted from plants. Fruit Juices,Vegetable Juices,Fruit Juice,Juice, Fruit,Juice, Vegetable,Juices, Fruit,Juices, Vegetable,Vegetable Juice
D001628 Beverages Liquids that are suitable for drinking. (From Merriam Webster Collegiate Dictionary, 10th ed) Beverage
D012996 Solutions The homogeneous mixtures formed by the mixing of a solid, liquid, or gaseous substance (solute) with a liquid (the solvent), from which the dissolved substances can be recovered by physical processes. (From Grant & Hackh's Chemical Dictionary, 5th ed) Solution
D013447 Sulfites Inorganic salts of sulfurous acid. Sulfite,Sulfites, Inorganic,Inorganic Sulfites
D014920 Wine Fermented juice of fresh grapes or of other fruit or plant products used as a beverage. Wines

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