ASTM E1788-16 Standard test method for Acidity in Acrylonitrile

ASTM E1788-16 Standard test method for Acidity in Acrylonitrile

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.


    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.


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


    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.


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


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