混合碱中碳酸根和碳酸氢根含量的测定——双混合指示剂法-《郑州大学学报(工学版)》

文章信息/Info

Title:: Determination of carbonate and bicarbonate in mixed base -- double mixed indicator method

Author(s):: Liu Zhenkun; Department of Chemical Engineering, Zhengzhou Institute of Technology

摘要:: 本文提出了用双混合指示剂测定混合碱中碳酸盐和碳酸氢盐含量的方法。由于第一个终点使用了(酚酞、甲酚红、百里酚兰)三种指示剂,所以终点颜色的转变较为明显,外观效果比其它方法有所提高,第二个终点是使用甲基红和溴甲酚绿两种指示剂,它比单独使用甲基橙或甲基红颜色的变化鲜明,终点容易判断,应用此法对不同含量的人工合成样品以及天然碱矿作了大量测定,所得结果较为满意(本法曾用电位法作了对比),此法手续简单,适于工业生产上应用。

Abstract:: This paper presents a method for the determination of carbonate and bicarbonate content in mixed alkali with double mixed indicator.Due to the use of three indicators (phenolphthalein, cresol red, thymol blue) in the first end point, the change in color of the end point is more obvious, and the appearance effect is improved than that of other methods, the second end point is the use of methyl red and bromocresol green two indicators, which are more distinct than the use of methyl orange or methyl red alone, and the end point is easy to judgeA large number of samples and natural alkali ore have been measured, and the results obtained are satisfactory. The method is simple and suitable for industrial application.