[Determination of trace amounts of salicylic acid and acetylsalicylic acid in polopirin and other drugs containing acetylsalicylic acid].

A liquid chromatography procedure has been employed for the quantitative determination of trace amounts of salicylic acid, acetylsalicylic salicylic acid and acetylsalicylic anhydride in several Polish drugs containing aspirin. The results were compared with those obtained by other workers for analogous foreign drugs.