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ASTM D6408-99

(Test Method)

Standard Test Method for Analysis of Tannery Liquors

Standard Test Method for Analysis of Tannery Liquors

SCOPE
1.1 This test method covers the analysis of tannery liquors made up from vegetable tanning materials.
1.2 The values stated in SI units are to be regarded as the 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
09-May-1999
ICS
59.140.10 - Processes and auxiliary materials
Technical Committee
D31 - Leather
Drafting Committee
D31.01 - Vegetable Leather
Current Stage
Ref Project

Relations

Replaced By
ASTM D6408-99(2004) - Standard Test Method for Analysis of Tannery Liquors
Effective Date
01-Apr-2004
Referred By
ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
Effective Date
10-May-1999
Referred By
ASTM D6406-99(2020) - Standard Test Method for Analysis of Sugar in Vegetable Tanning Materials
Effective Date
10-May-1999

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ASTM D6408-99 - Standard Test Method for Analysis of Tannery 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 6408 – 99
Standard Test Method for
Analysis of Tannery Liquors
This standard is issued under the fixed designation D 6408; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope spent materials that are dissolved or suspended in water, are
part of the soluble solids determined by Test Method D 6402,
1.1 This test method covers the analysis of tannery liquors
and do react with or bind to hide powder when mixed as in this
made up from vegetable tanning materials.
test method.
1.2 The values stated in SI units are to be regarded as the
3.1.3 vegetable tannins—mixtures of substances (natural
standard.
products) obtained from plant tissues by water extraction
1.3 This standard does not purport to address all of the
which have the chemical and physical properties necessary to
safety concerns, if any, associated with its use. It is the
convert animal hides and skins into leather.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use.
4.1 An analytical solution is prepared from the sample of
2. Referenced Documents tannery liquor (Practice D 6404). Specimen aliquots from this
analytical solution are then analyzed for total solids (Test
2.1 ASTM Standards:
Method D 4903), soluble solids and insolubles (Test Method
D 4903 Test Method for Total Solids and Water in Vegetable
D 6402), non-tannins and tannin (Test Method D 6401), and
Tanning Material Extracts
total acidity (Test Method D 6410).
D 4904 Practice for Cooling of Analytical Solutions
D 6401 Test Method for Determining Non-Tannins and
5. Significance and Use
Tannin in Extracts of Vegetable Tanning Materials
5.1 This test method is used to determine the chemical
D 6402 Test Method for Determining Soluble Solids and
2 properties of tannery liquors which are relevant for the
Insolubles in Extracts of Vegetable Tanning Materials
vegetable tanning process and influence the astringency of
D 6404 Practice for Sampling of Vegetable Materials Con-
2 vegetable tanning liquors. The astringency of liquors is depen-
taining Tannin
dent upon the solids and tannin content and the acidity. This
D 6410 Test Method for Determining Acidity of Vegetable
2 method provides a standard procedure for determining these
Tanning Liquors
properties for any sample of vegetable tanning liquor.
2.2 ALCA Methods:
3 5.2 The specimens are aliquots from the analytical solution
A25 Analysis of Tannery Liquors
prepared from the sample of tannery liquor collected for this
3. Terminology purpose.
5.3 The total solids, soluble solids, and non-tannins content
3.1 Definitions:
are determined and then the tannin content of the liquor sample
3.1.1 tannery liquor—water solutions containing vegetable
is calculated. Because the amount of tannin per liter of
tannin that are made up and used in a vegetable tannery.
analytical solution is less than that required for Test Method
3.1.2 tannin—an astringent substance found in the various
D 6401, a table specifying the quantity of prepared hide
parts of plants such as bark, wood, leaves, nuts, fruits, roots,
powder to be used for solutions with lower tannin concentra-
etc. Also, quantitatively, tannins are operationally defined as
tions is included in this test method.
the non-volatile materials present in tannin extracts and raw or
5.4 The total acidity of the liquor sample is determined by
one of two titrametric procedures described in Test Method
This test method is under the jurisdiction of ASTM Committee D-31 on Leather
D 6410.
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
5.5 The results of this test method are dependent on a great
test method has been adapted from and is a replacement for Method A25 of the
many variables but particularly upon: the temperature condi-
Official Methods of the American Leather Chemists Association.
tions under which the solutions were prepared and stored and
Current edition approved May 10, 1999. Published August 1999.
Annual Book of ASTM Standards, Vol 15.04.
the temperature at which the current analysis is performed; the
Official Methods of the American Leather Chemists Association. Available
uniformity and consistency of the Kaolin paste layer deposited
from the American Leather Chemists Association, University of Cincinnati, P.O.
onto the filter paper; the rate of solution run-out from the
Box 210014, Cincinnati, OH 45221-0014.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 6408
pipette; conditions related to the properties of the hide powder 8.1.2 Prepare the analytical solution for this analysis by
used to react with the tannin content of the solution; etc. It is, diluting a specimen aliquot from the tannery liquor sample to
therefore, essential that the method be followed exactly in the mark ina1L volumetric flask with distilled water. The
order to obtain reproducible results both among specimens aliquot specimen shall be of such size that, after dilution the
within a laboratory and for analyses between laboratories. analytical solution shall contain as nearly as possible 7.0 g total
solids per litre. Follow the above procedure except where such
6. Apparatus and Reagents
dilution would give more than 3.5 g tannin per litre. In this case
select the aliquot specimen size such that after dilution the
6.1 Analytical Solution:
analytical solution shall contain as nearly as possible, but not
6.1.1 Flask, 1 L volumetric. Class A flasks with a bulb in the
exceed, 3.5 g tannin per litre, irrespective of the solids conte
...

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