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磺胺类药物的含量测定,多采用重氮化反应外指示剂法指示终点。由于终点不明显,操作者很难掌握,国家药典1977年版规定,对此类药物的含量测定,采用重氮化反应要用永停滴定法指示终点,但由于目前缺少合适的永停滴定仪,因此外指示剂法乃被许多药检工作者所采用。为了提高磺胺类药物含量测定的准确度,我们用一台581型光电比色计改装成永停滴定仪,经多年实践中试用,取得了满意的结果,现介绍如下:
Sulfa drugs determination, the use of diazotization reaction indicator method to indicate the end point. Because the end point is not obvious, the operator is difficult to grasp, the provisions of the National Pharmacopoeia 1977 edition, the determination of such drugs, the use of diazotization reaction to stop the titration method to indicate the end point, but due to the current lack of a suitable permanent stop titrator, Therefore, the external indicator method is used by many drug testing workers. In order to improve the accuracy of determination of sulfa drugs, we use a 581 photoelectric colorimeter modified Wing stop titrator, after many years of trial practice and achieved satisfactory results are as follows: