ASTM D4900-99(2009)

Standard Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts

SIGNIFICANCE AND USE
The test method is useful to detect possible adulteration of tanning material extract with cheap and inferior lignosulfonates.
SCOPE
1.1 This test method is intended for use in detecting the presence of lignosulfonates (sulfite cellulose) in extracts of tanning materials.
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-2009
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Replaces: ASTM D4900-99(2004) - Standard Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts
• Effective Date: 01-Apr-2009
• Referred By: ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
• Effective Date: 01-Apr-2009

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4900 −99(Reapproved2009)
Standard Test Method for
Lignosulfonates (Sulfite Cellulose) in Tanning Extracts
This standard is issued under the fixed designation D4900; 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 4. Significance and Use
1.1 This test method is intended for use in detecting the 4.1 The test method is useful to detect possible adulteration
presence of lignosulfonates (sulfite cellulose) in extracts of of tanning material extract with cheap and inferior lignosul-
tanning materials. fonates.
1.2 The values stated in SI units are to be regarded as
5. Specimen
standard. No other units of measurement are included in this
5.1 The sample shall be drawn as described in Practice
standard.
D6404.
1.3 This standard does not purport to address all of the
5.2 The specimen shall consist of 5 mL of a solution of
safety concerns, if any, associated with its use. It is the
analytical strength (4.0 g tannin per L), prepared as described
responsibility of the user of this standard to establish appro-
in Practices D4901, D4905, and Practice D6405.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Apparatus and Reagents
2. Referenced Documents
6.1 Aniline.
2.1 ASTM Standards:
6.2 Hydrochloric Acid, concentrated.
D4901 Practice for Preparation of Solution of Liquid Veg-
6.3 Comparison Solution—This shall contain lignosulfonate
etable Tannin Extracts
(sulfite cellulose) in the proportion of 1 g total solids to 2000
D4905 Practice for Preparation of Solution of Solid, Pasty
mLof solution, and as much tanning material, similar to and of
and Powdered Vegetable Tannin Extracts
the same type as that being tested but known to be free from
D6404 Practice for Sampling Vegetable Materials Contain-
lignosulfonate, as will make up the solution to analytical
ing Tannin
strength.
D6405 Practice for Extraction of Tannins from Raw and
Spent Materials
7. Procedure
2.2 ALCA Methods:
7.1 Place the specimen in a test tube.Add 0.5 mLof aniline,
A50 Lignosulfonates (Sulfite Cellulose)
and shake well. Add 2 mL of concentrated hydrochloric acid,
3. Summary of Test Method
and again shake mixture well.
3.1 The reaction with aniline, of a tanning material extract
8. Results
specimen is compared with that of a solution containing
lignosulfonate and tanning material known to be free from 8.1 If at least as much precipitate remains at the end of 15
min as is obtained when the comparison solution is similarly
lignosulfonate.
treated, the material shall be held to contain lignosulfonates
(sulfite cellulose) and the fact shall be noted on the analysis
This test method is under the jurisdiction ofASTM Committee D31 on Leather
report.
and is the direct responsibility of Subc
...