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本文介绍制剂中扑热息痛的K_2Cr_2O_7氧化—分光测定法,操作简易快速,结果准确,适合常规分析使用。在6M硫酸中于80℃经15分钟,扑热息痛与K_2Cr_2O_7能产生定量的氧化还原反应,铬(Ⅵ)被定量还原成铬(Ⅲ),后者在580nm有最大光吸收,测定铬(Ⅲ)的量便可求得扑热息痛的含量。当扑热息痛的浓度在400μg/ml以下时服从比耳定律。其表观摩尔吸收系数为1620升·摩尔~1·厘米~1。方法取0.135M K_2Cr_2O_7的12M H_2SO_4溶液10.00ml和12M H_2SO_4溶液15.00ml置50ml量瓶中,加扑热息痛标准溶液(1mg
This article describes the preparation of paracetamol K_2Cr_2O_7 oxidation - spectrophotometry, simple and quick operation, the results are accurate, suitable for routine analysis. In 6M sulfuric acid at 80 ℃ for 15 minutes, paracetamol and K2Cr2O7 can produce quantitative redox reaction, chromium (Ⅵ) is quantitatively reduced to chromium (Ⅲ), which has the maximum light absorption at 580nm, the determination of chromium The amount can be obtained paracetamol content. Beer’s law is obeyed when the concentration of paracetamol is below 400 μg / ml. The apparent molar absorption coefficient of 1620 liters · mole ~ 1 · cm ~ 1. Methods Take 10.00ml of 12M H 2 SO 4 solution and 15.00ml of 12M H 2 SO 4 solution of 0.135M K 2 Cr 2 O 7 in a 50ml volumetric flask and add the standard solution of paracetamol (1mg