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ASTM

ASTM D3897-91(2012)

(Practice)

Standard Practice for Calculation of Basicity of Chrome Tanning Liquors

Standard Practice for Calculation of Basicity of Chrome Tanning Liquors

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.

General Information

Status
Historical
Publication Date
31-Mar-2012
ICS
59.140.10 - Processes and auxiliary materials
Technical Committee
D31 - Leather
Drafting Committee
D31.06 - Chemical Analysis
Current Stage
Ref Project

Relations

Replaces
ASTM D3897-91(2006) - Standard Practice for Calculation of Basicity of Chrome Tanning Liquors
Effective Date
01-Apr-2012
Replaced By
ASTM D3897-17 - Standard Practice for Calculation of Basicity of Chrome Tanning Liquors
Effective Date
01-Sep-2017

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ASTM D3897-91(2012) - Standard Practice for Calculation of Basicity of Chrome Tanning LiquorsASTM D3897-91(2012) - Standard Practice for Calculation of Basicity of Chrome Tanning Liquors
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ASTM D3897-91(2012) - Standard Practice for Calculation of Basicity of Chrome Tanning Liquors
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D3897 − 91 (Reapproved 2012)
Standard Practice for
Calculation of Basicity of Chrome Tanning Liquors
This standard is issued under the fixed designation D3897; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Results
1.1 This practice is intended to show how the results of the 5.1 The basicity of the liquor shall be expressed according
chromium analysis (Test Method D3898) and the acidity to the Schorlemmer system. In this system, the basicity is the
determination(TestMethodD3913)canbecombinedtopermit per cent of the total chromic oxide that is combined with
calculation of the basicity of a chrome tanning liquor. hydroxyl and is calculated as follows:
1.2 The values stated in SI units are to be regarded as A 2 B
Basicity, % 5 3100 (1)
standard. No other units of measurement are included in this A
standard.
where:
1.3 This standard does not purport to address all of the
A = the amount of thiosulfate, as mL of 0.1 N solution
safety concerns, if any, associated with its use. It is the
required to titrate the 25 mL aliquot as the specimen in
responsibility of the user of this standard to establish appro-
Test Method D3898,
priate safety and health practices and determine the applica-
B = the amount of sodium hydroxide, as mL of 0.1 N
bility of regulatory limitations prior to use.
solution required to titrate the 25 mL aliquot of the
specimen in Test Method D3913.
2. Referenced Documents
6. Precision and Bias
2.1 ASTM Standards:
D3898 Test Method for Chromic Oxide in Basic Chromium
6.1 Because basicity is in effect a ratio, the precision
Tanning Liquors
indexes are transmitted by the laws governing ratios. If the
D3913 Test Method forAcidity in Basic Chromium Tanning
precision of accuracy of the chromic oxide determination or of
Liquors
the titratable acidity is expressed in the same relative units; for
example, percent of value being determined, the precision with
3. Significance and Use
which the basicity is known will be:
3.1 Basicity is a ratio. In any chromic salt solution, the
2 2
P 5 =P 1P (2)
B C A
R
electrovalence of the chromium (+3) is satisfied by the hy-
droxyl ions and by acid ions. The extent to which this where:
electravalence is satisfied by the hydroxyl ions, expressed as a
P = precisionofacidityinbasicchromiumtanningliquors,
A
percentage, is the basicity. The basicity of a chrome tanning
liquid is closely related to the tanning behavior of the solution.
P = precision of chromic oxide in basic chromium tanning
C
R
liquors,
4. Procedure
P = precision of basicity in basic chromium
...

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