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  • ASTM
    D3913-03(2009) Standard Test Method for Acidity in Basic Chromium Tanning Liquors (Redline)
    Edition: 2009
    $55.41
    Unlimited Users per year

Description of ASTM-D3913 2009

ASTM D3913 - 03(2009)

Standard Test Method for Acidity in Basic Chromium Tanning Liquors

Active Standard ASTM D3913 | Developed by Subcommittee: D31.06

Book of Standards Volume: 15.04




ASTM D3913

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 This property, equal to the percentage by which anions in a normal chromic salt have been replaced by hydroxyl in the solution being analyzed, is closely related to the tanning behavior of the solution.

1. Scope

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.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D3898 Test Method for Chromic Oxide in Basic Chromium Tanning Liquors


Keywords

acidity; basic chromium tanning liquor; basicity; Acidity, alkalinity, pH--leather; Chrome-tanning materials; Tanning liquors; Titratable acidity;


ICS Code

ICS Number Code 59.140.10 (Processes and auxiliary materials)


DOI: 10.1520/D3913-03R09

ASTM International is a member of CrossRef.

ASTM D3913

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