测定植物汁液pH的新混合指示剂及其使用

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。两法获得的结果是相似的,而且它们的最大变化是小于0.3个pH单位。此法的优点是快速、简单和价廉。

THE USE OF A NEW MIXED INDICATOR FOR DETERMINATION OF _PH VALUE OF PLANT SAP

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. The results obtained from the two methods were almost the same and their maximum variation was less than 0.3 pH unit. The advantages of this method are rapidity, simplicity (little apparatus) and inexpensiveness.