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ASTM D3913-03(2009)

Historical Reaffirmation

Standard Test Method for Acidity in Basic Chromium Tanning Liquors

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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.

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 This property, equal to the percentage by which anions in a normal chromic salt have been replaced by hydroxyl in the solution being analyzed, is closely related to the tanning behavior of the solution.

SDO ASTM: ASTM International
Document Number D3913
Publication Date April 1, 2009
Language en - English
Page Count 3
Revision Level 03(2009)
Supercedes
Committee D31.06
Publish Date Document Id Type View
May 10, 2003 D3913-03 Revision
April 1, 2020 D3913-03R20E01 Reaffirmation
Sept. 1, 2015 D3913-03R15 Reaffirmation
April 1, 2009 D3913-03R09 Reaffirmation
Jan. 10, 1998 D3913-93R98 Reaffirmation