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ASTM D3897-18

Current Revision

Standard Practice for Calculation of Basicity of Chrome Tanning Liquors

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1.1 This test method is intended to show how the results of the chromium analysis (Test Methods D3898 or D6019) and the acidity determination (Test Method D3913) can be combined to permit calculation of the basicity of a chrome tanning liquor.

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.


3.1 Basicity is a ratio. In any chromic salt solution, the electrovalence of the chromium (+3) is satisfied by the hydroxyl ions and by acid ions. The extent to which this electravalence is satisfied by the hydroxyl ions, expressed as a percentage, is the basicity. The basicity of a chrome tanning liquid is closely related to the tanning behavior of the solution.

SDO ASTM: ASTM International
Document Number D3897
Publication Date Sept. 1, 2018
Language en - English
Page Count 2
Revision Level 18
Supercedes
Committee D31.06
Publish Date Document Id Type View
Sept. 1, 2018 D3897-18 Revision
Sept. 1, 2017 D3897-17 Revision
April 1, 2012 D3897-91R12 Reaffirmation
Oct. 1, 2006 D3897-91R06 Reaffirmation
May 15, 1991 D3897-91R01 Reaffirmation
May 15, 1991 D3897-91R96 Reaffirmation