The ASTM D2896 standard, developed by the American Society for Testing and Materials (ASTM), includes two test methods for the determination of basic components in petroleum products by titration with perchloric acid in glacial acetic acid.
-tayini-(astm-d2896).jpg "Determination of TBN (Total Number of Bases) (ASTM D2896)")
Procedures A and B use different titration solvent volumes and sample weights. A cycle over a range of new and used oil and additive concentrates showed that the two procedures yielded statistically equivalent results.
The full name of this standard is: ASTM D2896-15 Standard test method for the base number of petroleum products by potentiometric perchloric acid titration.
The standard appendix contains an alternative solvent system that eliminates the use of chlorobenzene in this test method. Using the alternative solver gives statistically equivalent results, but the precision is worse.
Components considered to have essential properties include organic and inorganic bases, amino compounds, salts of weak acids (soaps), basic salts of polyacidic bases, and salts of heavy metals. This test method applies to both fresh oils and used oils.
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