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现行统编初中化学课本在《溶液》一章中,列入了“纸上层析”一段教材。这是一个新内容,对我们多数中学化学教师来说,是比较陌生的。为了节省同志们一点时间,笔者先走了一步,做了一些实验。现着重就课本上所选用的课堂演示实验和纸上层析的基本原理,做一简单介绍。
The textbook of the current junior high school chemistry textbook is listed in the chapter “Solutions” and a “paper chromatography” section is included. This is a new content and is relatively unfamiliar to most of our middle school chemistry teachers. In order to save the comrades a bit of time, the author took a step and did some experiments. The current emphasis is on a brief introduction to the classroom demonstration experiments and the basic principles of paper chromatography used in textbooks.