The contentsof the three components were determined by absorption values messured at 6 dif-ferent wavelengths. The average recoveries for aminopyrin, phenacetin and caffeinewere 99.3%, 99.3% and 99.1%, respectively.

• 氨基比林、非那西丁、咖啡因的平均回收率分别为99.；3%25、99