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ASTM D6408-99(2004)

(Test Method)

Standard Test Method for Analysis of Tannery Liquors

Standard Test Method for Analysis of Tannery Liquors

SIGNIFICANCE AND USE
This test method is used to determine the chemical properties of tannery liquors which are relevant for the vegetable tanning process and influence the astringency of vegetable tanning liquors. The astringency of liquors is dependent upon the solids and tannin content and the acidity. This method provides a standard procedure for determining these properties for any sample of vegetable tanning liquor.
The specimens are aliquots from the analytical solution prepared from the sample of tannery liquor collected for this purpose.
The total solids, soluble solids, and non-tannins content are determined and then the tannin content of the liquor sample is calculated. Because the amount of tannin per liter of analytical solution is less than that required for Test Method D 6401, a table specifying the quantity of prepared hide powder to be used for solutions with lower tannin concentrations is included in this test method.
The total acidity of the liquor sample is determined by one of two titrametric procedures described in Test Method D 6410.
The results of this test method are dependent on a great many variables but particularly upon: the temperature conditions under which the solutions were prepared and stored and the temperature at which the current analysis is performed; the uniformity and consistency of the Kaolin paste layer deposited onto the filter paper; the rate of solution run-out from the pipette; conditions related to the properties of the hide powder used to react with the tannin content of the solution; etc. It is, therefore, essential that the method be followed exactly in order to obtain reproducible results both among specimens within a laboratory and for analyses between laboratories.
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
31-Mar-2004
ICS
59.140.10 - Processes and auxiliary materials
Technical Committee
D31 - Leather
Drafting Committee
D31.01 - Vegetable Leather
Current Stage
Ref Project

Relations

Replaces
ASTM D6408-99 - Standard Test Method for Analysis of Tannery Liquors
Effective Date
01-Apr-2004
Replaced By
ASTM D6408-99(2009) - Standard Test Method for Analysis of Tannery Liquors
Effective Date
01-Apr-2009
Referred By
ASTM D6406-99(2020) - Standard Test Method for Analysis of Sugar in Vegetable Tanning Materials
Effective Date
01-Apr-2004
Referred By
ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
Effective Date
01-Apr-2004

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ASTM D6408-99(2004) - 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:D6408–99(Reapproved2004)
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 etc. Also, quantitatively, tannins are operationally defined as
the non-volatile materials present in tannin extracts and raw or
1.1 This test method covers the analysis of tannery liquors
spent materials that are dissolved or suspended in water, are
made up from vegetable tanning materials.
part of the soluble solids determined by Test Method D 6402,
1.2 The values stated in SI units are to be regarded as the
and do react with or bind to hide powder when mixed as in this
standard.
test method.
1.3 This standard does not purport to address all of the
3.1.3 vegetable tannins—mixtures of substances (natural
safety concerns, if any, associated with its use. It is the
products) obtained from plant tissues by water extraction
responsibility of the user of this standard to establish appro-
which have the chemical and physical properties necessary to
priate safety and health practices and determine the applica-
convert animal hides and skins into leather.
bility of regulatory limitations prior to use.
4. Summary of Test Method
2. Referenced Documents
2 4.1 An analytical solution is prepared from the sample of
2.1 ASTM Standards:
tannery liquor (Practice D 6404). Specimen aliquots from this
D 4903 TestMethodforTotalSolidsandWaterinVegetable
analytical solution are then analyzed for total solids (Test
Tanning Material Extracts
Method D 4903), soluble solids and insolubles (Test Method
D 4904 Practice for Cooling of Analytical Solutions
D 6402), non-tannins and tannin (Test Method D 6401), and
D 6401 Test Method for Determining Non-Tannins and
total acidity (Test Method D 6410).
Tannin in Extracts of Vegetable Tanning Materials
D 6402 Test Method for Determining Soluble Solids and
5. Significance and Use
Insolubles in Extracts of Vegetable Tanning Materials
5.1 This test method is used to determine the chemical
D 6404 Practice for Sampling of Vegetable Materials Con-
properties of tannery liquors which are relevant for the
taining Tannin
vegetable tanning process and influence the astringency of
D 6410 Test Method for Determining Acidity of Vegetable
vegetable tanning liquors. The astringency of liquors is depen-
Tanning Liquors
dent upon the solids and tannin content and the acidity. This
2.2 ALCA Methods:
3 method provides a standard procedure for determining these
A25 Analysis of Tannery Liquors
properties for any sample of vegetable tanning liquor.
3. Terminology 5.2 The specimens are aliquots from the analytical solution
prepared from the sample of tannery liquor collected for this
3.1 Definitions:
purpose.
3.1.1 tannery liquor—water solutions containing vegetable
5.3 The total solids, soluble solids, and non-tannins content
tannin that are made up and used in a vegetable tannery.
aredeterminedandthenthetannincontentoftheliquorsample
3.1.2 tannin—an astringent substance found in the various
is calculated. Because the amount of tannin per liter of
parts of plants such as bark, wood, leaves, nuts, fruits, roots,
analytical solution is less than that required for Test Method
D 6401, a table specifying the quantity of prepared hide
This test method is under the jurisdiction ofASTM Committee D31 on Leather
powder to be used for solutions with lower tannin concentra-
and is the direct responsibility of Subcommittee D31.01 onVegetable Leather .This
tions is included in this test method.
test method has been adapted from and is a replacement for Method A25 of the
Official Methods of the American Leather Chemists Association.
5.4 The total acidity of the liquor sample is determined by
Current edition approved April 1, 2004. Published May 2004. Originally
one of two titrametric procedures described in Test Method
approved in 1999. Last previous edition approved in 1999 as D 6408 – 99.
2 D 6410.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.5 The results of this test method are dependent on a great
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
many variables but particularly upon: the temperature condi-
the ASTM website.
tions under which the solutions were prepared and stored and
Official Methods of the American Leather Chemists Association. Available
the temperature at which the current analysis is performed; the
from the American Leather Chemists Association, University of Cincinnati, P.O.
Box 210014, Cincinnati, OH 45221-0014. uniformity and consistency of the Kaolin paste layer deposited
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6408–99 (2004)
onto the filter paper; the rate of solution run-out from the 8.1.2 Prepare the analytical solution for this analysis by
pipette; conditions related to the properties of the hide powder diluting a specimen aliquot from the tannery liquor sample to
used to react with the tannin content of the solution; etc. It is, the mark ina1L volumetric flask with distilled water. The
therefore, essential that the method be followed exactly in aliquot specimen shall be of such size that, after dilution the
order to obtain reproducible results both among specimens analyticalsolutionshallcontainasnearlyaspossible7.0gtotal
within a laboratory and for analyses between laboratories. solids per litre. Follow the above procedure except where such
dilutionwouldgivemorethan3.5gtanninperlitre.Inthiscase
6. Apparatus and Reagents
select the aliquot specimen size such that after dilution the
6.1 Analytical Solution: analytical solution shall c
...

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