TAN (ASTM D664-18)
Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration ASTM D664-18 1. Scope 1.1 This test method covers procedures for the determination of acidic constituents in petroleum products, lubricants, biodiesel, and blends of biodiesel. 1.1.1 Test Method A—For petroleum products and lubricants soluble or nearly soluble in mixtures of toluene and propan-2-ol. …