ASTM-D3897 Standard Test Method for Calculation of Basicity of Chrome Tanning Liquors

ASTM-D3897 - 2018 EDITION - CURRENT
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Scope

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.

Significance and Use

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.

Keywords

basicity; chrome tanning liquor; Schorlemmer;; 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

ASTM-D3897-18

Revision Level

2018 EDITION

Status

Current

Modification Type

Revision

Publication Date

Sept. 1, 2018

Document Type

Test Method

Page Count

2 pages

Committee Number

D31.06