两种吸收光度法同时测定果味饮料中苯甲酸钠和山梨酸钾含量的比较研究

A Comparative Study on Two Ultraviolet Spectrophotometry Methods for Simultaneous Determination of Sodium Benzoate and Potassium Sorbate in Fruit-flavored Beverages

目的:选择果味饮料中苯甲酸钠和山梨酸钾含量的测定方法。方法:分别采用等吸收点法、多元线性回归法测定饮料中苯甲酸钠和山梨酸钾的含量,并对测量结果进行比较。结果:多元线性回归测得苯甲酸钠回收率99.75%～100.9%,山梨酸钾回收率99.16%～101.1%,等吸收点法测得苯甲酸钠回收率98.58%～99.38%,山梨酸钾回收率98.42%～99.56%。结论:多元线性回归方法更适用于果味碳酸饮料中苯甲酸钠和山梨酸钾的同时测定。

Objective：To choose an appropriate method to measure sodium benzoate（SB）and potassium sorbate（PS） in the fruitflavored beverages. Method：The content of SB and PS in the fruit-flavored beverages were determined by multiwavelength linear regression and iso-absorptive point double-wavelength UV spectrophotometry, and the performance of the two methods were compared. Results：Recovery of PS and SB by multiwavelength linear regression spectrophotometry was 99.75%-100.9% and 99.16%-101.1% respetively, and recovery of PS and SB by iso-absorptive point double-wavelength was 98.58%-99.38% and 98.42%-99.56% respetively. Conclusion：Multiwavelength linear regression is more suitable method to measure SB and PS in the fruit-flavored beverages.