Specific reagents like salicylaldehyde or phenyl isothiocyanate are added to reacting samples to isolate specific amine types before titration.
Total Base Number measures the alkalinity of an oil. In lubricants (especially engine oils), TBN indicates the ability to neutralize acids formed during combustion. A high TBN means the oil has significant reserve alkalinity to fight corrosion and sludge. astm d2074 pdf
: By using selective reagents (like salicylaldehyde to block primary amines), the method can isolate and calculate the specific value for each amine type [1, 4]. Applications astm d2074 pdf