A colorimetric method of new miked indicator with a wide range and clear changes of colour for pH values of plant sap was studied and compared with the electrometric method. Using leaf samples from various trees of several ranges in pH.

• 研究了一个测定植物汁液pH值的范围广、颜色变化清楚的新混合指示剂比色法。 这个方法用属于几个pH范围的树叶样品与电位计法作了比较。