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ASTM D 664 Document Information:
Title
Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration
ASTM International
Publication Date:
Jul 1, 2007
Scope:
This test method covers procedures for the determination of
acidic constituents in petroleum products and lubricants soluble or
nearly soluble in mixtures of toluene and propan-2-ol. It is
applicable for the determination of acids whose dissociation
constants in water are larger than 10-9; extremely weak
acids whose dissociation constants are smaller than 10-9
do not interfere. Salts react if their hydrolysis constants are
larger than 10-9. The range of acid numbers included in
the precision statement is 0.1 mg/g KOH to 150 mg/g KOH.
NOTE 1—In new and used oils, the constituents that may be
considered to have acidic characteristics include organic and
inorganic acids, esters, phenolic compounds, lactones, resins,
salts of heavy metals, salts of ammonia and other weak bases, acid
salts of polybasic acids, and addition agents such as inhibitors
and detergents.
The test method may be used to indicate relative changes that
occur in oil during use under oxidizing conditions regardless of
the color or other properties of the resulting oil. Although the
titration is made under definite equilibrium conditions, the test
method is not intended to measure an absolute acidic property that
can be used to predict performance of oil under service conditions.
No general relationship between bearing corrosion and acid number
is known.
NOTE 2—The acid number obtained by this standard may or may not
be numerically the same as that obtained in accordance with Test
Methods D 974 and D 3339. There has not been any attempt to
correlate this method with other non-titration methods.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- acid number
- lubricants
- petroleum products
- potentiometric
- strong acid number
- titration
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