pH 指示剂吸收度比值法是在六十年代后期发展起来的一种新的分析方法,适用于中和滴定中终点突跃不明显或不易滴定的物质,故可广泛用于具有弱酸、弱碱性物质、药物或制剂的含量测定。该法系采用中和法同分光光度法相结合,测定吸收度,求得吸收度比值(?),即可计算含量。此法具灵敏度高、变动系数小、简便快速等优点。本文介绍该法的适应范围、测定原理、所需条件、测定方法及计算等。 The method of absorbance ratio of pH indicator is a new analytical method developed in the late 1960s. It is suitable for the substance whose end point jump is not obvious or difficult to be titrated in neutralization titration. Determination of content of substances, drugs or preparations. The law and neutralization method with the combination of spectrophotometry, determination of absorption, absorption ratio obtained (?), You can calculate the content. This method with high sensitivity, small coefficient of change, simple and quick and so on. This article describes the scope of the law, the determination of principle, the required conditions, determination methods and calculations.