Determination of acetic acid,tartaric acid,sorbic acid and benzoic acid in beverages added organic modifier by ion chromatography

Objective:A novel and promotional ion chromatographic method was developed for the simultaneous determination of food additives in beverage samples including acetic acid,tartaric acid,sorbic acid and benzoic acid.Methods:Ion Pac AS14A was selected as the separation column,5% acetonitrile-5 mmol/L Sodium Carbonate-5 mmol/L Sodium Bicarbonate was isocratic eluent.After being decolorized with activated carbon and filtrated,the samples was injected and analyzed by ion chromatography.Results:Enable to easily and effectively separate and determine four sorts of food additives in beverages.In this method,good relative(0.9993～0.9999),low detection limit(0.063 mg/L～0.45 mg/L,S/N=3),good average recoveries rates added standard(95.9%～101.5%) were obtained.Meanwhile,no interference was found in the presence of common inorganic anions.The results were satisfactory.Conclusion:Organic modifier could not only reduce the analysis time,but also improve the peak shape.Pre-treatment is simple,the method is accurate and detection limit is low.It is suitable for simultaneous determination of four sorts of food additives in beverages.