The Study Of Oscillographic Precipitation Titration

The oscillographic titration as a new method in the electricity analysis has developed rapidly in the past ten years. Because of no any indicator can be used in its operation, it is hardly affected by the color of the solution and the precipitation, and it has many advantages such as cheap instruments, rapid and convenient operation, visual end-point and so on ,which widens its application area and abounds the method of usual quantity.The determination by the oscillographic titration of nitrogen content in ammonium has been studied in this work, and protein content in milk powder or flour was determinated. Being compared with standard methods, nontoxic tetrathylammonium chloride titrant can be used, and distillation, absorption and indicator are not necessary. In addition, its application in determination of organic sulfuride according to the fact that organic sulfuride can react with Ag+. also the surfacants can be measured by this method. Moreover, the oscillographic titration of silver and copper content in silver alloy was reported.All of methods above had good selectivity and high accuracy. The standard rate of recovery was 99.0-101% and the relative standard deviation was no more than 1.3%.