ASTM D6407-99(2004)

Standard Test Method for Analysis of Iron and Copper in Vegetable Tanning Materials

SIGNIFICANCE AND USE
This test method is used to determine the quantity of iron and copper present in vegetable tanning materials or vegetable tannin extracts prepared using Practices D 4901, D 6404, or D 6405.
Because of the possibility of errors in this test method it is 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 iron and copper content in vegetable tanning materials. This test method is applicable to liquid, solid, pasty and powdered extracts, to raw and spent materials, and to tannery liquors.
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

Relations

• Replaces: ASTM D6407-99 - Standard Test Method for Analysis of Iron and Copper in Vegetable Tanning Materials
• Effective Date: 01-Apr-2004
• Replaced By: ASTM D6407-99(2009) - Standard Test Method for Analysis of Iron and Copper in Vegetable Tanning Materials
• Effective Date: 01-Apr-2009
• Referred By: ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
• Effective Date: 01-Apr-2004

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D6407–99(Reapproved2004)
Standard Test Method for
1
Analysis of Iron and Copper in Vegetable Tanning Materials
This standard is issued under the fixed designation D 6407; 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 4. Significance and Use
1.1 This test method is intended for use in determining iron 4.1 This test method is used to determine the quantity of
and copper content in vegetable tanning materials. This test iron and copper present in vegetable tanning materials or
method is applicable to liquid, solid, pasty and powdered vegetable tannin extracts prepared using Practices D 4901,
extracts, to raw and spent materials, and to tannery liquors. D 6404,or D 6405.
1.2 The values stated in SI units are to be regarded as the 4.2 Because of the possibility of errors in this test method it
standard. is essential that the method be followed exactly in order to
1.3 This standard does not purport to address all of the obtain reproducible results both among specimens within a
safety concerns, if any, associated with its use. It is the laboratory and for analyses between laboratories.
responsibility of the user of this standard to establish appro-
5. Apparatus and Reagents
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.1 Sulfuric Acid, concentrated (96 %).
5.2 Sulfuric Acid Solution, diluted 1:20 with distilled water.
2. Referenced Documents
5.3 Nitric Acid, fuming.
2
2.1 ASTM Standards: 5.4 Hydrochloric Acid, concentrated (36 %).
D 4901 Practice for Preparation of Solution of Liquid Veg- 5.5 Hydrochloric Acid Solution, 0.1 N.
etable Tannin Extracts 5.6 Bromine Water, saturated solution.
D 4902 Test Method for Evaporation and Drying of Ana- 5.7 Ammonium Hydroxide Solution, concentrated diluted
lytical Solutions 1:1 with distilled water.
D 4905 Practice for Preparation of Solution of Solid, Pasty, 5.8 Potassium Permanganate Solution, 0.1 N.
and Powdered Vegetable Tannin Extracts 5.9 Potassium (or Ammonium) Thiocyanate Solution,10g
D 6404 Practice for Sampling of Vegetable Materials Con- shall be dissolved in distilled water and diluted to 100 mLwith
taining Tannin distilled water.
D 6405 Practice for Extraction of Tannins from Raw and 5.10 Stock Iron Solution, This may be a purchased iron
Spent Materials standard solution or may be prepared as follows:
2.2 ALCA Methods: 5.10.1 0.70 g of crystallized ferrous ammonium sulfate
3
A31 Method for Copper and Iron in Tanning Materials [FeSO •(NH ) SO •6H O] shall be dissolved in 50 mL of
4 4 2 4 2
distilled water and 20 mL of dilute sulfuric acid (diluted 1:4).
3. Summary of Test Method
5.10.2 This solution shall be titrated with 0.1 N potassium
3.1 A specified quantity of the tanning material is analyzed permanganate solution until a faint pink persists for 1 minute
for iron and copper and content.
and the iron is completely oxidized.
5.10.3 Dilute this solution to 1 L with distilled water. 1 mL
of this solution is equivalent to 0.0001 g Fe.This solution shall
1
This test method is under the jurisdiction ofASTM Committee D31 on Leather
be stored in brown bottles and be protected from light.
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
5.10.4 Standard Iron Solution, 10 mL of the prepared stock
test method has been adapted from and is a replacement for Method A31 of the
Official Methods of the American Leather Chemists Association. solution, or its equivalent of purchased iron standard solution,
Current edition approved April 1, 2004. Published May 2004. Originally
shall be diluted to 100 mL with distilled water. 1 mL of this
approved in 1999. Last previous edition approved in 1999 as D 6407 – 99.
standard solution is equivalent to 0.00001 g Fe. The standard
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
solution shall be freshly prepared for each analysis.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
5.11 Stock Copper Solution, 3.9283 g of copper sulfate
the ASTM website.
crystals (CuSO •5H O) shall be dissolved in distilled water
3
4 2
Official Methods of the American Leather Chemists Association. Available
and diluted to 1 L with distilled water. 1 mL of this solution is
from the American Leather Chemists Association, University of Cincinnati, P.O.
Box 210014, Cincinnati, OH 45221-0014. equivalent to 0.001 g Cu.
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