用氢氧化铁作电泳演示实验,难度大,耗时多,效果差。笔者通过多次实验探索,找到了采用淀粉胶体、稀碘液和醋酸-醋酸钠缓冲溶液的混和溶液作电泳实验,现象明显,耗时少,能收到较好的效果。这个实验成功的关键是一定要加适量的醋酸-醋酸钠缓冲溶液,控制 pH 值在4—5之 The use of ferric hydroxide as an electrophoresis demonstration experiment is difficult, time-consuming and ineffective. Through multiple experiments and explorations, the author found a mixed solution using starch colloid, dilute iodine solution and acetate-sodium acetate buffer solution as an electrophoresis experiment. The phenomenon is obvious, less time-consuming, and can receive better results. The key to the success of this experiment is to add an appropriate amount of acetic acid-sodium acetate buffer solution to control the pH value of 4-5.