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应用导数比率法，测定复方本甲酸可中的苯甲酸；于297.6nm波长处直接测定复方未甲酸酊中的水杨酸，其回收率分别为100．09％和100．11％，RSD值分别为0．40％和0．51％。
The derivatization ratio method was used to determine the benzoic acid in the compound formic acid. The direct determination of salicylic acid in the compound non-formic acid tincture at the wavelength of 297.6nm was 100.09% and 100.11% respectively. The RSD values were 0.40% and 0.51%.