Standard Historical Last Updated: Oct 16, 2017 Track Document
ASTM D3897-91(2012)

Standard Practice for Calculation of Basicity of Chrome Tanning Liquors

Standard Practice for Calculation of Basicity of Chrome Tanning Liquors D3897-91R12 ASTM|D3897-91R12|en-US Standard Practice for Calculation of Basicity of Chrome Tanning Liquors Standard new BOS Vol. 15.04 Committee D31
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Significance and Use

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.

Scope

1.1 This practice is intended to show how the results of the chromium analysis (Test Method D3898) 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 and health practices and determine the applicability of regulatory limitations prior to use.

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Details
Book of Standards Volume: 15.04
Developed by Subcommittee: D31.06
Pages: 2
DOI: 10.1520/D3897-91R12
ICS Code: 59.140.10