ASTM E1788-16 Standard test method for Acidity in Acrylonitrile

Scope:

ASTM E1788-16 involves the determination of total acidity as acetic acid in concentrations below 500 μg/g in acrylonitrile. This method is used to determine acidity in low levels.

Test Procedure:

In ASTM E1788-16 test method, 100 mL of sample and 0.5mL of bromothymol, blue indicator solution are placed in a 250 ml Erlenmeyer flask. The resultant solution is titrated with 0.02 meq/mL NaOH solution till the first perceptible blue color is seen.  

Test Specimen:

Acrylonitrile sample (100 mL) is titrated.

Data:

In ASTM E1788-16 test method, the acidity of the sample can be calculated by,

Where:

A = NaOH solution required for titration of sample, mL,

N = meq/mL of the NaOH solution,

B = volume of sample used, mL, and

D = Sp Gr of the sample at the test temperature.

Conclusion:

Hence, we can determine the Acidity of Acrylonitrile using the ASTM E 1788-16 Standard test method.