利用系数倍率双波长标准加入法 ,同时测定了复方阿司匹林中阿司匹林、扑热息痛和咖啡因的含量。其方法简单、快速 ,混合组分可不经分离同时测定。 3组分中阿司匹林、扑热息痛和咖啡因的测定线性范围分别 0～ 40mg/L、0～ 2 0mg/L、0～ 6mg/L。相对标准差是 :3 .8%、3.8%、7.5 %。 Coefficient multiplier double-wavelength standard addition method was used to determine the contents of aspirin, paracetamol and caffeine in the compound aspirin. The method is simple and fast, and the mixed components can be measured simultaneously without separation. The linear range of determination of aspirin, paracetamol and caffeine was 0 ~ 40mg / L, 0 ~ 20mg / L and 0 ~ 6mg / L, respectively. The relative standard deviations are: 3.8%, 3.8%, 7.5%.