Standard Active Last Updated: Apr 17, 2020 Track Document
ASTM D3913-03(2020)e1

Standard Test Method for Acidity in Basic Chromium Tanning Liquors

Standard Test Method for Acidity in Basic Chromium Tanning Liquors D3913-03R20E01 ASTM|D3913-03R20E01|en-US Standard Test Method for Acidity in Basic Chromium Tanning Liquors Standard new BOS Vol. 15.04 Committee D31
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Significance and Use

4.1 The acidity of a chrome tanning liquor, as determined by this test method, is rarely employed as such. This result is normally combined with the results of a chromium analysis (see Test Method D3898) to determine a property of the liquor called basicity. This property, equal to the percentage by which anions in a normal chromic salt have been replaced by hydroxyl in the solution being analyzed, is closely related to the tanning behavior of the solution.


1.1 This test method covers the determination of the titratable acidity of chromium tanning liquors. By titratable acidity is meant not only free acidity, which is rarely present, but also anions combined with weakly basic cations such as Chromium (III), which can be titrated with base at the phenolphthalein end point.

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

1.3 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.

1.4 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.

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Book of Standards Volume: 15.04
Developed by Subcommittee: D31.06
Pages: 3
DOI: 10.1520/D3913-03R20E01
ICS Code: 59.140.10