Methods The acid-base titrations was used for determination of benzoic acid and salicylic acid,UV was used for determination of salicylic acid.

• 方法:用中和法测定两酸的总量,用紫外分光光度法测定水杨酸的含量,从总量中减去水杨酸的含量即为苯甲酸的含量。