Formaldehyde. Determination in foods. (NMKL 54, 1964)
Formaldehyde. Determination in foods.
Free formaldehyde and formaldehyde from hexamethylene-
tetramine, or otherwise reversibly bound formaldehyde is
steam-distilled from a solution or suspension of the food
acidified with phosphoric acid. Formaldehyde is detected and
determined coloritmetrically by reaction with chromotropic
acid. The chromotropic acid reaction is not applicable in the
presence of higher alcohols which inhibit the colour-formation.
Formaldehyde (NMKL 54)