ASTM D974-22
Standard Test Method for Acid and Base Number by Color-Indicator Titration
- Standard No.
- ASTM D974-22
- Release Date
- 2022
- Published By
- American Society for Testing and Materials (ASTM)
- Latest
- ASTM D974-22
- Scope
- 1.1 This test method covers the determination of acidic or basic constituents (Note 1) in petroleum products3 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. 1.2 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. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D974-22 Referenced Document
- ASTM D117 Standard Guide for Sampling, Test Methods, Specifications, and Guide for Electrical Insulating Oils of Petroleum Origin
- ASTM D1193 Standard Specification for Reagent Water
- ASTM D2 Method of Test for Abrasion of Rock by Use of the Deval Machine
- ASTM D4057 Standard Practice for Manual Sampling of Petroleum and Petroleum Products
- ASTM D4175 Standard Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants*， 2023-07-01 Update
- ASTM D4177 Standard Practice for Automatic Sampling of Petroleum and Petroleum Products
- ASTM D4739 Standard Test Method for Base Number Determination by Potentiometric Titration
- ASTM D664 Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration
ASTM D974-22 history
- 2022 ASTM D974-22 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2021 ASTM D974-21 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2014 ASTM D974-14e2 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2014 ASTM D974-14e1 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2014 ASTM D974-14 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2012 ASTM D974-12 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2011 ASTM D974-11 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2008 ASTM D974-08e1 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2008 ASTM D974-08 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2007 ASTM D974-07 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2006 ASTM D974-06 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2004 ASTM D974-04 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2002 ASTM D974-02e1 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2002 ASTM D974-02 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 2001 ASTM D974-01 Standard Test Method for Acid and Base Number by Color-Indicator Titration
- 1997 ASTM D974-97 Standard Test Method for Acid and Base Number by Color-Indicator Titration
