In ASTM E1788-16 test method, the total acidity of acrylonitrile is determined as acetic acid in concentrations below 500 μg/g. Acrylonitrile sample is titrated with alcoholic sodium hydroxide solution to the visual endpoint.

In ASTM E1788-16 test method, the total acidity of acrylonitrile is determined as acetic acid in concentrations below 500 μg/g. Acrylonitrile sample is titrated with alcoholic sodium hydroxide solution to the visual endpoint.
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.
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