ASTM-D3913 Historical Revision Information
Standard Test Method for Acidity in Basic Chromium Tanning Liquors

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Standard Test Method for Acidity in Basic Chromium Tanning Liquors


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 and health practices and determine the applicability of regulatory limitations prior to use.

Significance and Use

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 D 3898) 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 This property, equal to the percentage by which anions in a normal chromic salt have been replaced by hydroxyl in the solution being analyzed, is closely related to the tanning behavior of the solution.


acidity; basic chromium tanning liquor; basicity; Acidity, alkalinity, pH--leather; Chrome-tanning materials; Tanning liquors; Titratable acidity; ICS Number Code 59.140.10 (Processes and auxiliary materials)

To find similar documents by ASTM Volume:

15.04 (Soaps and Other Detergents; Polishes; Leather; Resilient Floor Coverings)

To find similar documents by classification:

59.140.10 (Processes and auxiliary materials)

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Document Number


Revision Level

2003 R09 EDITION



Modification Type


Publication Date

July 1, 2009

Document Type

Test Method

Page Count

3 pages

Committee Number