Titration method for determination of acidity of industrial glycol

1 Subject content and scope of application

This standard specifies the method for determining the acidity of industrial glycol

This method is suitable for the determination of the acidity of industrial glycol with a minimum detection concentration of 0.

2 Reference standards

Preparation of GB 601 standard solution for chemical reagent titration analysis (volume analysis)

Preparation of preparations and products used in GB 603 chemical reagent test method

GB/T 6680 General Rules for Sampling of Liquid Chemical Products

3 Principles of the method

The acidic substance in the sample is titrated with sodium hydroxide standard titration solution until the phenolphthalein indicator turns reddish, the reaction formula is as follows:

4 Instruments and reagents

4.

4.

4.

4.

4.

4.

5 Measurement steps

Pour ammonia gas into the 500mL Erlenmeyer flask (4.

6 Calculations and reports

The acidity of ethylene glycol (in terms of acetic acid ) is calculated by the following formula;

In the formula: X—— The acidity of ethylene glycol , %(m/m);

V——The volume of sodium hydroxide standard titration solution consumed by the titration sample, mL;

C—— The concentration of sodium hydroxide standard titration solution, mol/L;

m——the mass of the sample, g;

0.

Report the arithmetic mean of the results of two repeated determinations

Related link: Discharge system for propylene liquid or gaseous light olefin samples (Supplement)