ASTM D848 Test Method for Acid Wash Color of Industrial Aromatic Hydrocarbons
4. Summary of Test Method
4.1 A mixture of the aromatic hydrocarbon and sulfuric acid is vigorously shaken and the color of the acid layer is compared with that of color standards prepared from CoCl2 and FeCl3.
5. Significance and Use
5.1 This test method is suitable for setting specifications on the materials referenced in 1.1. It may also be used as an internal quality control tool and in development or research work.
5.2 The color developed in the acid layer gives an indication of impurities which if sulfonated would cause the material to be discolored.
