Method for measuring content of chlorine in mixed acid electrolyte through potentiometric titration

A potentiometric titration and electrolyte technology, which is used in chemical analysis, measuring device, chemical method analysis, etc. by titration method, can solve the problem that the content of trivalent and tetravalent vanadium cannot be determined, it is not suitable for vanadium ion solution, and cannot be accurately measured. Solve problems such as solution state, achieve accurate determination of valence state and total vanadium content, improve stability and accuracy, and smooth the oxidation titration curve.

Active Publication Date: 2017-02-15
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional methods for detecting chloride ion content, such as the silver method, are not suitable for solutions containing vanadium ions with obvious colors
[0004] In addition, use a strong oxidant, such as potassium permanganate to fix the chlorine-containing vanadium solution, because potassium permanganate can oxidize chloride ions. In the process of oxidizing tetravalent vanadium, the electrode potential change behavior of the solution changes. , the curve jitters in the t...

Method used

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  • Method for measuring content of chlorine in mixed acid electrolyte through potentiometric titration
  • Method for measuring content of chlorine in mixed acid electrolyte through potentiometric titration
  • Method for measuring content of chlorine in mixed acid electrolyte through potentiometric titration

Examples

Experimental program
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Effect test

Embodiment 1

[0058] 1. Preparation of silver nitrate standard solution

[0059] 1A. Weigh 8.5g of commercially available analytically pure silver nitrate and dissolve it in 1000mL of high-purity water, and transfer it to a brown reagent bottle for storage until calibration;

[0060] 2. Calibration of silver nitrate standard solution

[0061]2A. Weigh 0.9g (accurate to 0.0001g) of standard sodium chloride and burn it at 500-600°C to constant weight, put it in a 250mL quartz beaker, add high-purity water to dissolve;

[0062] 2B. Quantitatively transfer the solution in 2A into a 250mL volumetric flask, make up to volume with high-purity water, shake well, transfer to a thin-mouthed polyethylene bottle for storage, label the reagent well, and store it at room temperature in the dark;

[0063] 2C. Accurately pipette 5.00mL of the sodium chloride standard solution in 2B into a plastic beaker, add 40mL of high-purity water and 1mL of nitric acid (1+1) in sequence, and titrate to the end point w...

experiment example 2

[0088] ---Precision, accuracy, and recovery experiments of the chloride ion detection method of the present invention

[0089] (1) Precision experiment

[0090] Experimental method: select 5 different electrolyte samples, respectively measure the chloride ion concentration according to the detection method described in Example 1, and calculate the relative standard deviation. The experimental results are shown in Table 1.

[0091] The precision experiment result of the detection method of the present invention in table 1

[0092] sample Measured value (mol / L) Average(mol / L) Relative standard deviation RSD Electrolyte sample 1 7.827,7.817,7.821,7.815,7.826 7.821 0.07 Electrolyte sample 2 8.537,8.523,8.539,8.515,8.532 8.529 0.12 Electrolyte sample 3 8.668,8.675,8.672,8.673,8.661 8.670 0.06 Electrolyte sample 4 9.685,9.717,9.684,9.699,9.705 9.698 0.14 Electrolyte sample 5 7.776,7.785,7.798,7.794,7.786 7.788 0.11

[0093...

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Abstract

The invention discloses a method for measuring content of chlorine in a mixed acid electrolyte through potentiometric titration. According to the method, the chlorine content of a to-be-measured solution is titrated by adopting a silver nitrate standard solution, a titration end point is judged according to change of electric potential in a titration process, and the content of chloride ions in a tested sample is calculated according to the volume of the consumed silver nitration solution. By means of sample dilution and addition of an appropriate amount of nitric acid in a sample processing process, on one hand, the influence of other acid radicals in the sample on the titration is eliminated; on the other hand, trivalent vanadium ions in the solution are oxidized into tetravalent vanadium ions through addition of nitric acid, so that complexing capacity between the vanadium ions and the chloride ions is reduced, and the reaction of titrating the chloride ions by silver nitrate is enabled to be more smooth and more stable. According to the chloride ion concentration obtained by the test, a chloride ion masking agent is added through calculation, and the content of trivalent vanadium and tetravalent vanadium in the solution is measured with a potassium permanganate-potentiometric titration method. The method effectively avoids disturbance of the chloride ions on the vanadium measurement process and is fast and accurate.

Description

technical field [0001] The invention relates to the technical field of material measurement, in particular to a method for determining the content of main components in a mixed acid electrolyte by potentiometric titration. Background technique [0002] As an emerging energy storage battery, vanadium battery has been widely used in the field of new energy in recent years. Electrolyte, as the main energy storage medium, is the main component of vanadium batteries. The composition and concentration of acid groups in the electrolyte solution will affect the stability, viscosity, and conductivity of the solution, and ultimately affect the efficiency of the battery. By controlling the composition and concentration of the acid, the performance of the electrolyte can be greatly improved. Therefore, it is necessary to accurately measure the concentration of various acid radicals in order to adjust them in time. Chloride ion is an important part of acid radicals, and its rapid and a...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/34
CPCG01N1/34G01N31/164
Inventor 曾繁武刘月菊姜雪莲宋明明郝玥
Owner DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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