ASTM D6401-99(2009)
(Test Method)Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials
Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials
SIGNIFICANCE AND USE
This test method is used to determine the proportion of the total soluble solids which are soluble non-tannins and the proportion which are tannins in a solution of tannin extract or in the water extract from raw or spent materials prepared for tannin analysis.
The specimens are aliquots from the analytical solutions prepared from tannin extracts or the water extract solutions prepared from raw or spent materials.
The soluble non-tannins are defined as the portion of the soluble solids which are not absorbed or bound by a prepared hide powder material.
The tannins are defined as the portion of the soluble solids which are absorbed or bound by a prepared hide powder material.
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 is intended for use in determining the quantity of soluble non-tannins and tannin in solutions of tannin extracts, water extracts of vegetable tanning materials, or tanning liquors. The method is applicable to the analysis of liquid, solid, pasty, and powdered extracts and to extracts of raw or spent materials.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.
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
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6401 − 99 (Reapproved2009)
Standard Test Method for
Determining Non-Tannins and Tannin in Extracts of
1
Vegetable Tanning Materials
This standard is issued under the fixed designation D6401; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 ALCA Method:
3
A22Non-Tannins and Tannin
1.1 This test method is intended for use in determining the
quantity of soluble non-tannins and tannin in solutions of
3. Terminology
tannin extracts, water extracts of vegetable tanning materials,
or tanning liquors. The method is applicable to the analysis of 3.1 Definitions:
liquid, solid, pasty, and powdered extracts and to extracts of
3.1.1 soluble non-tannins—non-volatile materials present in
raw or spent materials. tannin extracts and raw or spent materials that are dissolved or
suspendedinwater,arepartofthesolublesolidsdeterminedby
1.2 The values stated in SI units are to be regarded as the
Test Method D6402, and do not react with or bind to hide
standard. The inch-pound units given in parentheses are for
powder when mixed as in this test method.
information only.
3.1.2 tannins—non-volatile materials present in tannin ex-
1.3 This standard does not purport to address all of the
tracts and raw or spent materials that are dissolved or sus-
safety concerns, if any, associated with its use. It is the
pended in water, are part of the soluble solids determined by
responsibility of the user of this standard to establish appro-
Test Method D6402, and do react with or bind to hide powder
priate safety and health practices and determine the applica-
when mixed as in this test method.
bility of regulatory limitations prior to use.
4. Summary of Test Method
2. Referenced Documents
2
4.1 An aliquot of the analytical solution prepared from
2.1 ASTM Standards:
tannin extracts (Practices D4901 or D4905) or of the water
D2617Test Method for Total Ash in Leather
extract from raw or spent materials (Practice D6405) is dried
D4901Practice for Preparation of Solution of Liquid Veg-
overnight in a forced-air oven (Test Method D4902) and the
etable Tannin Extracts
solid residue remaining is determined and defined as the total
D4902Test Method for Evaporation and Drying ofAnalyti-
solidsforthatsample(TestMethodD4903).Anotheraliquotof
cal Solutions
the same solution is passed through a specified filtering
D4903Test Method for Total Solids and Water in Vegetable
procedure and the quantity of solid residue remaining in the
Tanning Material Extracts
filtrate is determined and defined as the soluble solids for that
D4905Practice for Preparation of Solution of Solid, Pasty
sample; the calculated difference between the total solids and
and Powdered Vegetable Tannin Extracts
the soluble solids is defined as the insolubles for that sample
D6402Test Method for Determining Soluble Solids and
(Test Method D6402). Another aliquot of the original analyti-
Insolubles in Extracts of Vegetable Tanning Materials
cal solution or water extract is mixed with a prepared hide
D6405Practice for Extraction of Tannins from Raw and
powder material with the resulting solution being passed
Spent Materials
through the same filtering procedure as for the soluble solids
analysis. The quantity of solid residue remaining in the filtrate
1
is determined and defined as the soluble non-tannins for that
ThistestmethodisunderthejurisdictionofASTMCommitteeD31onLeather
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather.This
sample; the calculated difference between the total soluble
method has been adapted from and is a replacement for MethodA22 of the Official
solids and the soluble non-tannins is defined as the tannin
Methods of the American Leather Chemists Association.
content for that sample.
Current edition approved April 1, 2009. Published July 2009. Originally
approved in 1999. Last previous edition approved in 2004 as D6401–99(2004).
DOI: 10.1520/D6401-99R09.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Official Methods of the American Leather Chemists Association. Available
Standards volume information, refer to the standard’s Document Summary page on from the American Leather Chemists Association, University of Cincinnati, P.O.
the ASTM website. Box 210014, Cincinnati, OH 45221-0014.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D6401 − 99 (2009)
5. Significance and Use and 8.9 cm (3.5 in.) diameter.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.