The traditional basic chemistry experiment teaching method has many defects.WeChat is timely,accurate,low cost and widely used.Introducing WeChat as tool to the basic experiment teaching realized the sharing of experimental knowledge and timely interaction between teachers and students.It can be used to the release of teaching information,preview interpretation and summary of the test,answering questions after the experiment,laboratory safety education,a review of the experiments and expand,etc.The ex-perimental teaching derived from class to class and after class by intelligent mobile terminal.It played an important role in helping the students to better grasp basic knowledge and skills of experiment,stimulating students’interest in learning and the enthusiasm of the discussion questions,developed the their view of science and technology.At the same time,the use of WeChat extended the timeliness of the experimental teaching.

目前电厂EDTA锅炉清洗废水COD高达数万毫克每升，采用常规处理方法很难处理达标。本文作者利用Fenton试剂和吸附饱和活性炭联合处理电厂锅炉EDTA酸洗废水。通过改变pH调节方式、H2O2投加量及饱和活性炭投加量，使此联合方法对EDTA酸洗废水的处理效果最佳。

Through coal, slag, botton and fly ashes sampling from a 300MW utility boiler at the rated load and analysis of total and hexavalent chromium contents of those samples.the total chromium quantity distribution in coal and its combustion products was derived by means of mass balance methods. Characteristics of chromium transformation in a large-scale utility boiler is,therefore,analyzed and discussed. During coal combustion,the total chromium quantity in flue gas to raw coal is about 84% .The total chromium quantity in slag, bottom ash is about 1.1%, 0.6% respectively. The total chromium quantity in fly ashes can be distributed as 11.1% in No.l ESP outlet, 1.2% in No.2 ESP outlet, 1.3% in No.3 ESP outlet.In combustion products,the chromium in flue gas takes a very high ratio.