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ASTM International - ASTM D4739-08

Standard Test Method for Base Number Determination by Potentiometric Hydrochloric Acid Titration

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Organization: ASTM International
Publication Date: 1 February 2008
Status: inactive
Page Count: 8
ICS Code (Chemical analysis): 71.040.40
significance And Use:

New and used petroleum products can contain basic constituents that are present as additives. The relative amount of these materials can be determined by titration with acids. The base number is a... View More

scope:

1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and new and used lubricants. This test method resolves these constituents into groups having weak-base and strong-base ionization properties, provided the dissociation constants of the more strongly basic compounds are at least 1000 times than that of the next weaker groups. This test method covers base numbers up to 250.

1.2 In new and used lubricants, the constituents that can be considered to have basic properties are primarily organic and inorganic bases, including amino compounds. This test method uses hydrochloric acid as the titrant, whereas Test Method D 2896 uses perchloric acid as the titrant. This test method may or may not titrate these weak bases and, if so, it will titrate them to a lesser degree of completion; some additives such as inhibitors or detergents may show basic characteristics.

1.3 When testing used engine lubricants, it should be recognized that certain weak bases are the result of the service rather than having been built into the oil. This test method can be used to indicate relative changes that occur in oil during use under oxidizing or other service conditions regardless of the color or other properties of the resulting oil. The values obtained, however, are intended to be compared with the other values obtained by this test method only; base numbers obtained by this test method are not intended to be equal to values by other test methods. Although the analysis is made under closely specified conditions, this test method is not intended to, and does not, result in reported basic properties that can be used under all service conditions to predict performance of an oil; for example, no overall relationship is known between bearing corrosion or the control of corrosive wear in the engine and base number.

1.4 This test method was developed as an alternative for the former base number portion of Test Method D 664 (last published in Test Method D 664-81).

1.4.1 Colorimetric test methods for base number are Test Method D 974, IP 139, and 5102.1 on acid and base number by extraction (color-indicator titration) of Federal Test Method Standard No. 791b. Test results by these methods may or may not be numerically equivalent to this test method.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 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.

Document History

December 1, 2017
Standard Test Method for Base Number Determination by Potentiometric Hydrochloric Acid Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and new and used lubricants. This test method resolves these constituents into groups having...
June 1, 2017
Standard Test Method for Base Number Determination by Potentiometric Hydrochloric Acid Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and new and used lubricants. This test method resolves these constituents into groups having...
May 15, 2011
Standard Test Method for Base Number Determination by Potentiometric Hydrochloric Acid Titration
New and used petroleum products can contain basic constituents that are present as additives. The relative amount of these materials can be determined by titration with acids. The base number is a...
ASTM D4739-08
February 1, 2008
Standard Test Method for Base Number Determination by Potentiometric Hydrochloric Acid Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and new and used lubricants. This test method resolves these constituents into groups having...
February 1, 2008
Standard Test Method for Base Number Determination by Potentiometric Hydrochloric Acid Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and new and used lubricants. This test method resolves these constituents into groups having...
November 1, 2006
Standard Test Method for Base Number Determination by Potentiometric Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and lubricants (Note 1). The test method resolves these constituents into groups having...
July 1, 2006
Standard Test Method for Base Number Determination by Potentiometric Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and lubricants (Note 1). The test method resolves these constituents into groups having...
November 1, 2005
Standard Test Method for Base Number Determination by Potentiometric Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and lubricants (Note 0). The test method resolves these constituents into groups having...
December 10, 2002
Standard Test Method for Base Number Determination by Potentiometric Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and lubricants (Note 1). The test method resolves these constituents into groups having...
January 1, 1996
Standard Test Method for Base Number Determination by Potentiometric Titration
1.1 This test method covers a procedure for the determination of basic constituents in petroleum products and lubricants (Note 1). The test method resolves these constituents into groups having...
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