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ASTM D974

Standard Test Method for Acid and Base Number by Color-Indicator Titration

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Organization: ASTM
Publication Date: 1 December 2014
Status: active
Page Count: 7
ICS Code (Petroleum products in general): 75.080
ICS Code (Lubricants, industrial oils and related products): 75.100
scope:

This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is applicable for the determination of acids or bases whose dissociation constants in water are larger than 10−9; extremely weak acids or bases whose dissociation constants are smaller than 10−9 do not interfere. Salts react if their hydrolysis constants are larger than 10−9.

NOTE 1-In new and used oils, the constituents considered to have acidic characteristics include organic and inorganic acids, esters, phenolic compounds, lactones, resins, salts of heavy metals, and addition agents such as inhibitors and detergents. Similarly, constituents considered to have basic properties include organic and inorganic bases, amino compounds, salts of weak acids (soaps), basic salts of polyacidic bases, salts of heavy metals, and addition agents such as inhibitors and detergents.

NOTE 2-This test method is not suitable for measuring the basic constituents of many basic additive-type lubricating oils. Test Method D4739 can be used for this purpose.

This test method can be used to indicate relative changes that occur in an oil during use under oxidizing conditions. Although the titration is made under definite equilibrium conditions, the method does not measure an absolute acidic or basic property that can be used to predict performance of an oil under service conditions. No general relationship between bearing corrosion and acid or base numbers is known.

NOTE 3-Oils, such as many cutting oils, rustproofing oils, and similar compounded oils, or excessively dark-colored oils, that cannot be analyzed for acid number by this test method due to obscurity of the color-indicator end point, can be analyzed by Test Method D664. The acid numbers obtained by this color-indicator test method need not be numerically the same as those obtained by Test Method D664, the base numbers obtained by this color indicator test method need not be numerically the same as those obtained by Test Method D4739, but they are generally of the same order of magnitude.

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.

*A Summary of Changes section appears at the end of this standard

 

 

 

Document History

ASTM D974
December 1, 2014
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
December 1, 2014
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
December 1, 2014
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
April 15, 2012
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
May 15, 2011
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
July 1, 2008
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
July 1, 2008
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
November 1, 2007
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
November 1, 2006
Standard Test Method for Acid and Base Number by Color-Indicator Titration
This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products2 and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol. It is...
November 1, 2004
Standard Test Method for Acid and Base Number by Color-Indicator Titration
(Footnote *) This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products(Footnote 2) and lubricants soluble or nearly soluble in mixtures of toluene and...
June 10, 2002
Standard Test Method for Acid and Base Number by Color-Indicator Titration
A description is not available for this item.
June 10, 2002
Standard Test Method for Acid and Base Number by Color-Indicator Titration
A description is not available for this item.
November 10, 2001
Standard Test Method for Acid and Base Number by Color-Indicator Titration
Scope This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl alcohol....
July 10, 1997
Standard Test Method for Acid and Base Number by Color-Indicator Titration
1. Scope 1.1 This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl...
July 10, 1997
Standard Test Method for Acid and Base Number by Color-Indicator Titration
1. Scope 1.1 This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products and lubricants soluble or nearly soluble in mixtures of toluene and isopropyl...
January 1, 1995
Standard Test Method for Acid and Base Number by Color-Indicator Titration (British Standard 2634) (IP Designation: 139/93)
A description is not available for this item.
December 15, 1993
STANDARD TEST METHOD FOR ACID AND BASE NUMBER BY COLOR-INDICATOR TITRATION (BRITISH STANDARD 2634) (IP 139/86)
A description is not available for this item.
October 15, 1992
STANDARD TEST METHOD FOR ACID AND BASE NUMBER BY COLOR-INDICATOR TITRATION (BRITISH STANDARD 2634) (IP 139/86)
A description is not available for this item.
October 30, 1987
STANDARD TEST METHOD FOR ACID AND BASE NUMBER BY COLOR-INDICATOR TITRATION (BRITISH STANDARD 2634) (IP 139/86)
A description is not available for this item.
October 25, 1985
STANDARD TEST METHOD FOR NEUTRALIZATION NUMBER BY COLOR-INDICATOR TITRATION
A description is not available for this item.

References

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