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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