ASTM D7704 Determining total Aldehydes in Styrene Monomer

ASTM D7704 Determining total Aldehydes in Styrene Monomer

ASTM D7704 is a method for the wet chemical determination of aldehydic components in styrene monomer. Amount of benzaldehyde is computed to report the total amount of aldehydes.

    Scope:

    The ASTM D7704 test technique is used to determine the number of aldehydic compounds in a product for quality control and assurance. A standard alcoholic potassium hydroxide solution is used to titrate the amount of hydrochloric acid generated, equal to the amount of aldehyde contained in the sample.

    Specimen size:

    The specimen should be conditioned between 0.001 to 0.030 mass percent.

    Calculation:

    The following formula should calculate the percentage of aldehyde as benzaldehyde:

    Aldehydes, mass % = [(A̶ B̶ C) ×N ×0.106)/25 ×D] ×100

    A = KOH solution required for titration 

    B = KOH solution required for titration 

    C = KOH solution required for titration of styrene 

    N = normality of KOH solution 

    D = density of styrene monomer.

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