Determination of the mass concentration of benzoic acid in non-alcoholic and low-alcohol products by the spectrophotometric method
In the production of low-alcohol and non-alcoholic beverages, the use of preservatives is allowed, including benzoic acid (BK) and its salts. Standard methods based on high performance liquid chromatography are used to control the content of this preservative. This work presents the results on the determination of benzoic acid in samples of low-alcohol and non-alcoholic products by the spectrophotometric method. Research has been carried out to establish the optimal wavelength when measuring the optical density of benzoic acid solutions. A calibration characteristic has been constructed to determine the mass concentration of benzoic acid, which makes it possible to determine its concentration in the range from 10 mg/dm3 to 500 mg/dm3 of benzoic acid, taking into account dilution. Metrological data have been obtained for constructing a calibration characteristic for the determination of benzoic acid in low-alcohol and non-alcoholic products. It is shown that the results of the determination of this preservative in the indicated products by the spectrophotometric method are comparable with the analogous results obtained using standard methods based on high performance liquid chromatography. The research results became the basis for the developed Methodology for measuring the mass concentration of sorbic and benzoic acids in low-alcohol and non-alcoholic products by the spectrophotometric method. The developed technique allows measuring the mass concentration of benzoic acid in low-alcohol and non-alcoholic products containing only benzoic acid. The spectrophotometric method for determining the mass concentration of BA is a less costly method for determining this preservative in a product than the currently used method of high-performance liquid chromatography, does not require special expensive equipment, additional consumables and specially trained personnel..