Formol Nitrogen in Hydrolyzed Protein
Formol nitrogen in hydrolysed protein (HAP) is measured by titrating with 0.1 mol/L sodium hydroxide up to pH 8.5 by adding neutral formaldehyde after the first titration with 0.1 mol/L sodium hydroxide to pH 8.5.
The amount of formal nitrogen is calculated from the difference in titration volume of 0.1mol/L sodium hydroxide between the first and second endpoint.