ASTM D2896 Base Number in Petroleum Products by Potentiometric Perchloric Acid Titration
Lubricants often contain basic additives, which may be quantified by base numbers. High base numbers indicate high levels of basic components, low base numbers indicate low levels of basic components. A decrease in base number during oil usage may indicate additive depletion. This test determines the total (strong + weak) base number. In new oil, it may be used as a quality control tool. In used oil it may indicate the remaining useful life.
The sample is weighed, titration solvent is added and the mixture is potentiometrically titrated with perchloric acid. The data is graphed, inflection points are determined, the blank is corrected for and the base number is determined. In cases where no inflection point can be determined, excessive potassium hydroxide is added, and the sample is back titrated with sodium acetate to determine the base number. The base number is reported in milligrams potassium hydroxide per gram of sample.
Use this test for new oils, or for oils where both strong and weak base numbers are of interest. For used oil consider ASTM D4739 Base Number Determination by Potentiometric Hydrochloric Acid Titration
Price: $263.00
Sample size: 20 g
Related tests:
- ASTM D974 – Acid or Base Number by Color-Indicator Titration; Neutralization Number
- ASTM D1093 – Acidity of Water Layer and distillation residues
- ASTM D1121 – Reserve Alkalinity of Antifreeze
- ASTM D2074 – Total Amine Value only
- ASTM D2989 – Acidity-Alkalinity of Halogenated Solvents/Mixtures
- ASTM D4739 – Base Number Total, by Hydrochloric Acid Method