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利用苯酚与苯酸盐的吸收度差异，采用差示分光光度法测定朵贝尔氏溶液中苯酸浓度，结果显示在浓度5一25ug／ml之间回收率=99．14％，RSD＝1.41％，可作为医院制剂的分析．
Using the difference of absorption between phenol and benzoate, the determination of benzoic acid in Doberman’s solution by differential spectrophotometry showed that the recovery was 99.14% and the RSD was 1.41% , Can be used as an analysis of hospital preparations.