Method for measuring content of chloridion in wet flat liquid

Abstract

The invention relates to a method for measuring the content of chloridion, in particular to a method for measuring the content of chloridion in wet flat liquid. The establishment of the method for measuring the content of chloridion in the wet flat liquid mainly adopts a calcination method to carbonize organic amine matters which restrict the chloridion, to form soluble inorganic matters, enables the chloridion to be dissociated, so that the content of the chloridion can be measured by a potentiometric titration method. The invention can accurately measure the content of chloridion in the wet flat liquid, provides an effective means for incoming quality control of the flat liquid, and avoids unqualified product being stored.

Description

technical field [0001] The invention relates to a method for determining the content of chloride ions, in particular to a method for determining the content of chloride ions in an alkaline solution. Background technique [0002] At present, there are various methods for the determination of chloride ions at home and abroad, such as using K 4 CrO 4 As an indicator, titrate with silver nitrate standard solution, and form red silver chromate precipitate near the equivalence point, and the solution turns from yellow to red at the same time, so as to judge the indicator method of titration end point; advanced ion chromatography using ion chromatography for trace analysis There is also the most commonly used environmentally friendly and economical potentiometric titration method. These methods have their own advantages and disadvantages. The color mutation of the indicator method is not very obvious, so judging with the naked eye may cause a large human error, and this method ca...

AI Technical Summary

Problems solved by technology

Under normal conditions, the wet leveling solution is alkaline, and the pH is between 9 and 10. When measuring chloride ions, the prepared solution needs to be adjusted to acidity, but the organic amine in the wet leveling solution can bind the acid to form (NH 2 ) n The substance of R·HCl prevents chlorine ions from being free in water, thus affecting the normal measurement of chloride ions. Generally, common organic solvents cannot break this phenomenon. We used the method of adding standard to conduct experiments, and the results verified this conclusion.

For this reason, we have discussed with companies such as Quake Chemical in the Netherlands, and through their same experiments, it has also been confirmed that it cannot be done with the general chloride ion content determination method.