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ASTM D4628-23

Current Revision

Standard Test Method for Analysis of Barium, Calcium, Magnesium, and Zinc in Unused Lubricating Oils by Atomic Absorption Spectrometry

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1.1 This test method is applicable for the determination of mass percent barium from 0.005 % to 1.0 %, calcium and magnesium from 0.002 % to 0.3 %, and zinc from 0.002 % to 0.2 % in lubricating oils.

1.2 Higher concentrations can be determined by appropriate dilution. Lower concentrations of metals such as barium, calcium, magnesium, and zinc at about 10 ppm level can also be determined by this test method. Use of this test method for the determination at these lower concentrations should be by agreement between the buyer and the seller.

1.3 Lubricating oils that contain viscosity index improvers may give low results when calibrations are performed using standards that do not contain viscosity index improvers.

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

1.5 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. Specific warning statements are given in 4.1, 7.3, and 9.1.

1.6 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.


5.1 Some oils are formulated with metal-containing additives that act as detergents, antioxidants, antiwear agents, etc. Some of these additives contain one or more of these metals: barium, calcium, zinc, and magnesium. This test method provides a means of determining the concentration of these metals that gives an indication of the additive content in these oils.

5.2 Several additive metals and their compounds are added to the lubricating oils to give beneficial performance. (See Table 1.)

SDO ASTM: ASTM International
Document Number D4628
Publication Date May 1, 2023
Language en - English
Page Count 7
Revision Level 23
Supercedes
Committee D02.03
Publish Date Document Id Type View
May 1, 2023 D4628-23 Revision
Dec. 1, 2016 D4628-16 Revision
Dec. 1, 2014 D4628-14 Revision
Nov. 1, 2005 D4628-05 Revision
Nov. 10, 2002 D4628-02 Revision
Nov. 10, 1997 D4628-97 Revision
May 1, 2011 D4628-05R11E01 Reaffirmation