Method for detecting copper content of ferric nitrate solution

Abstract

The invention relates to a method for detecting copper content of a ferric nitrate solution. By the adoption of the method for detecting copper ions in the ferric nitrate solution by an iodometric method, the time is greatly shortened, and the working efficiency is improved. The detection method comprises the following steps: (1) accurately transferring the ferric nitrate solution into a conical flask of 250 mL, and adding water of 30 to 50 mL; (2) titrating ammonia water with a volume ratio of 1: 1 to adjust the pH value of the ferric nitrate solution to 2.5; (3) adding a HAc-NaAc solution of 10 mL with the pH value of 3.6; (4) adding fluoride of 1.5 to 2.0 g, shaking the solution to discolor the solution from red to being colorless, wherein the fluoride is NaF; (5) adding a KI solution of 2.0 to 2.5 g, which is 2 to 3 times greater than the detection amount, to discolor the solution into dark yellow; and (6) titrating the solution to shallow yellow with a standard Na2S2O3 solution, adding a starch indicator solution of 3 mL to titrate the solution to shallow blue, and adding a NaSCN solution of 2mL to continuously titrate the solution until the blue disappears.

Description

technical field [0001] The invention relates to a method for detecting copper content in ferric nitrate solution. Background technique [0002] The original analysis method used the precipitation filtration method to eliminate the interference of iron ions, that is, in the alkaline ammonia solution, copper can form [Cu(NH 3 ) 2 ] 2+ The complex ions enter the solution, and the iron forms ferric hydroxide precipitation. The test solution is filtered, and the copper entering the filtrate is determined by the iodometric method to determine the copper content in the ferric nitrate solution. Because the precipitate of the ferric hydroxide that forms is flocculent, can have adsorption to the ion in the solution, so when filtering the test solution that forms ferric oxide precipitation, the recovery rate of copper ion in the filtrate is low, in order to ensure that the copper ion It is very time-consuming to collect as much as possible into the filtrate, and the general analysis...

AI Technical Summary

Problems solved by technology

Because the precipitate of the ferric hydroxide that forms is flocculent, can have adsorption to the ion in the solution, so when filtering the test solution that forms ferric oxide precipitation, the recovery rate of copper ion in the filtrate is low, in order to ensure that the copper ion It is time-consuming to collect as much as possible into the filtrate, and the general analysis time is two and a half hours

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