Method for measuring copper content of anode copper through automatic potentiometric titrator

Abstract

The invention belongs to the technical field of industrial analysis, and particularly relates to a method for measuring copper content of anode copper through an automatic potentiometric titrator. Themethod comprises the steps that step 1: the preparation of a sodium hyposulfite standard solution; step 2, the processing of a pure copper piece; step 3, 30 minutes' preheating of the potentiometrictitrator; step 4, the calibration of the sodium hyposulfite standard solution; step 5, the analysis of actual sample anode copper. The reaction principle is 2Cu2+ + 4I-=2CuI / + I2, I2 + I-=I3- and 2S2O32- + I3-= S4O62- + 3I-. The end point of titration does need to be indicated depending on the variation of the color of an indicator, the kinds of analyzed sample is more complicated, for cases in which end point indicating is difficult, with color, cloudy or an appropriate indicator cannot be find at all, the titration is acute and has small errors, compared with a normal titration method in which color changing of the indicator is observed, to-be-measured elements can be more conveniently and accurately measured, the analysis precision is improved, artificial errors are reduced, indicatorsare not needed, needed reagent is less, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of industrial analysis, and in particular relates to a method for measuring copper content in anode copper by an automatic potentiometric titrator. Background technique [0002] Ordinary titration methods rely on the color change of the indicator to indicate the titration end point. If the solution to be tested is colored or turbid, it is difficult to indicate the end point, or no suitable indicator can be found at all. [0003] Potentiometric titration is to indicate the end point of titration by the sudden jump of electrode potential. When performing potentiometric titration, an indicating electrode and a reference electrode are inserted into the measured solution to form a working battery. With the addition of the titrant and the progress of the chemical reaction, the measured ion concentration changes continuously, and the potential of the indicating electrode also changes accordingly. Before and after...

AI Technical Summary

Problems solved by technology

However, there are few reports on the automatic potentiometric titrator in the determination of high content copper

Images