RESUMO
Objective To develope a high performance liquid chromatography ( HPLC) method for simultaneous determination of benzoic acid and salicylic acid in compound benzoic acid embrocation. Methods An Alltima C18 column (150 mm×4.6 mm,5 μm) was used for the separation, with methanol-0.1％ phosphoric acid (50:50) as the mobile phase at the flow rate of 1.0 mL?min-1 .The detection wavelength was set at 236 nm.The column temperature was 35 ℃ . Results The good linearity was obtained with the correlation coefficient (r) of 1.0000 for benzoic acid and salicylic acid;the precisions and stability were satisfactory, and the relative standard deviations (RSDs) were less than 0.3％.The average recoveries (n= 9) were 100.15％ and 99.85％ for benzoic acid and salicylic acid, respectively. Conclusion The established method is accurate, simple and rapid, and can be utilized for the simultaneous determination of benzoic acid and salicylic acid in compound benzoic acid embrocation.