Petroleum products and lubricants – Determination of acid or base number - Colour-indicator titration method
Title : BDS ISO 6618:2021
This International Standard specifies a colour-indicator titration method for the determination of acidic or basic constituents in petroleum products and lubricants soluble in mixtures of toluene and propan-2-01. It is applicable for the determination of acids or bases whose dissociation constants in water are greater than 10-9; extremely weak acids or bases whose dissociation constants are less than 10-9 do not interfere. Salts react if their hydrolysis constants are greater than 10-9.