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ASTM D 2896 REV A Document Information:
Title
Standard Test Method for Base Number of Petroleum Products by Potentiometric Perchloric Acid Titration
ASTM International
Publication Date:
Jul 15, 2007
Scope:
This test method covers the determination of basic constituents
in petroleum products by titration with perchloric acid in glacial
acetic acid.
Procedures A and B use different titration solvent volumes and
sample weights.
NOTE 1—A round robin on a series of new and used oils and
additive concentrates has shown that the two procedures give
statistically equivalent results.
Appendix X2 provides the use of an alternative solvent system
which eliminates the use of chlorobenzene in this test method. The
use of the alternative solvent gives statistically equivalent
results; however, the precision is worse. Paragraph X2.5.5 provides
guidance when comparing results using the two different
solvents.
The constituents that may be considered to have basic
characteristics include organic and inorganic bases, amino
compounds, salts of weak acids (soaps), basic salts of polyacidic
bases, and salts of heavy metals.
NOTE 2—This test method is applicable to both fresh oils and
used oils as described in Sections 16, 17, and 19 and Appendix
X1.
This test method can be used to determine base number greater
than 300 mg KOH/g. However, the precision statement in Section 19
has been obtained only on base number less or equal to 300 mg
KOH/g.
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. For specific warning statements, see
Section 7, Section 10, and X2.2.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- base number
- perchloric acid
- petroleum products
- potentiometric titration
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