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在化学教学过程中,往往对某种物质的是否形成或存在,要求作出迅速的判断,应用纸上斑点反应,可以解决此类难题。其原理是:当待试溶液与试剂溶液如在滤纸上互相渗合在一起时,其显色反应的产物就固定于滤纸表面,且在被水润湿的圆圈内局部聚集成斑点或环圈。这样。就能清晰地判断出某种物质是否形成或存在。此法操作简单、快速,它有最低的检出限度和最高的灵敏度。其特效性、选择性和正
In the chemistry teaching process, it is often required to make a quick judgment on whether a certain substance is formed or existed. The application of spotted reaction on paper can solve such problems. The principle is that when the solution to be tested and the reagent solution are infiltrated with each other on the filter paper, the product of the color reaction is fixed on the surface of the filter paper, and localized into spots or loops within the water-wetted circle. . such. It can be clearly judged whether a substance has formed or existed. This method is simple and fast, it has the lowest detection limit and the highest sensitivity. Its special effects, selectivity and positive