ASTM D4900-99(2004)
(Test Method)Standard Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts
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.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 4900 – 99 (Reapproved 2004)
Standard Test Method for
Lignosulfonates (Sulfite Cellulose) in Tanning Extracts
This standard is issued under the fixed designation D 4900; 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 5. Specimen
1.1 This test method is intended for use in detecting the 5.1 The sample shall be drawn as described in Practice
presence of lignosulfonates (sulfite cellulose) in extracts of D 6404.
tanning materials. 5.2 The specimen shall consist of 5 mL of a solution of
1.2 This standard does not purport to address all of the analytical strength (4.0 g tannin per L), prepared as described
safety concerns, if any, associated with its use. It is the in Practices D 4901, D 4905, and Practice D 6405.
responsibility of the user of this standard to establish appro-
6. Apparatus and Reagents
priate safety and health practices and determine the applica-
6.1 Aniline.
bility of regulatory limitations prior to use.
6.2 Hydrochloric Acid, concentrated.
2. Referenced Documents
6.3 ComparisonSolution—Thisshallcontainlignosulfonate
2.1 ASTM Standards: (sulfite cellulose) in the proportion of 1 g total solids to 2000
D 4901 Practice for Preparation of Solution of Liquid Veg- mLof solution, and as much tanning material, similar to and of
etable Tannin Extracts the same type as that being tested but known to be free from
D 4905 Practice for Preparation of Solution of Solid, Pasty lignosulfonate, as will make up the solution to analytical
and Powdered Vegetable Tannin Extracts strength.
D 6404 Practice for Sampling of Vegetable Materials Con-
7. Procedure
taining Tannin
D 6405 Practice for Extraction of Tannins from Raw and 7.1 Place the specimen in a test tube.Add 0.5 mLof aniline,
and shake well. Add 2 mL of concentrated hydrochloric acid,
Spent Materials
2.2 ALCA Methods: and again shake mixture well.
A50 Lignosulfonates (Sulfite Cellulose)
8. Results
3. Summary of Test Method
8.1 If at least as much precipitate remains at the end of 15
3.1 The reaction with aniline, of a tanning material extract min as is obtained when the comparison solution is similarly
treated, the material shall be held to contain lignosulfonates
specimen is compared with that of a solution containing
lignosulfonate and tanning material known to be free from (sulfite cellulose) and the fact shall be noted on the analysis
report.
lignosulfonate.
8.2 Attention is drawn to the fact that some synthetic
4. Significance and Use
tannins give precipitates under the conditions of this test
4.1 The test method is useful to detect possible adulteration method.
of tanning material extract with cheap and inferio
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.