摘要
测定常量铁的重铬酸钾滴定方法存在铬污染,近来各种无汞无铬法测定铁受到关注。本实验针对KMnO4滴定常量铁含量方法终点观察不明显的缺点,采用分步指示的方法,即在接近终点时加入二苯胺磺酸钠为指示剂,极大地敏化了终点观察。改进后的实验用于大学化学实验教学,结果没有显著差别,表明在化学实验教学中有很大推广价值。
The dichromate titration method used in the titration of macro iron has Cr（ VI ） pollution, so more environmentally friendly redox laboratory for the determination of iron has been focused in recent years. To enhance the observation of the endpoint in the permanganate titration method, a two-step indication method was used in this laboratory exercise by adding diphenylamine-sulfonic acid sodium salt as an indicator. The modified laboratory exercise was used in the teaching of college chemistry laboratory, and the results indicate no obvious difference.
出处
《实验室研究与探索》
CAS
2008年第8期47-48,共2页
Research and Exploration In Laboratory
基金
湖北省高等学校省级教学研究项目(20060185)<大学化学实验>教学改革研究
关键词
分析化学
实验教学
环保
实验探索
analytical chemistry
experimental teaching
protection of environment
experiment exploring
