古典式玻璃活塞滴定管,是化学分析中经常使用的普通仪器。但在使用中感到有很多缺点:玻璃活塞上涂有凡士林油,它和标准溶液经常接触,一不注意就上升到刻度玻管壁周围,由于它不规则地吸附标准溶液,因此影响化验结果的准确性。同时,凡士林油沾在玻管壁上,就不容易洗涤净洁。凡士林油又和多种标准溶液接触,使之淌失得很快。例如滴定锰用的 Classical glass piston burettes, is commonly used in chemical analysis of ordinary instruments. However, there are many shortcomings in the use of felt: Vaseline glass coated with piston oil, it is often in contact with the standard solution, a careless rise to the scale around the glass tube wall, due to its irregular adsorption of standard solution, thus affecting the test results accuracy. At the same time, vaseline dip in the glass tube wall, it is not easy to clean and clean. Vaseline oil and a variety of standard solution in contact with the rapid loss. For example, titration of manganese used