ASTM D3897

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.

1. Scope

1.1 This practice is intended to show how the results of the chromium analysis (Test Method D 3898) and the acidity determination (Test Method D 3913) can be combined to permit calculation of the basicity of a chrome tanning liquor.

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.

2. Referenced Documents

ASTM Standards
D3898 Test Method for Chromic Oxide in Basic Chromium Tanning Liquors
D3913 Test Method for Acidity in Basic Chromium Tanning Liquors

Index Terms

basicity; chrome tanning liquor; Schorlemmer; ICS Number Code 59.140.10 (Processes and auxiliary materials)

Citing ASTM Standards

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