ASTM D4653-87(2003)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4653–87(Reapproved2003)
Standard Test Method for
Total Chlorides in Leather
This standard is issued under the fixed designation D 4653; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope flask and add 200 mL of 0.1 N ammonium hydroxide solution.
Immerse the flask up to the neck in a bath of boiling water.
1.1 This test method is intended for use in determining total
Thoroughly wet all particles by occasional swirling. After 2 h,
chlorides in mineral tanned leather.
cool the flask to room temperature and make the flask up to
1.2 This standard does not purport to address all of the
volume with distilled water, shake and without delay filter
safety concerns, if any, associated with its use. It is the
through a folded filter paper.
responsibility of the user of this standard to establish appro-
7.2 Discard the first 20 to 25 mL of the filtrate. Pipette 200
priate safety and health practices and determine the applica-
mL of the filtrate into a 600 mL beaker, add a few drops of
bility of regulatory limitations prior to use.
methyl orange indicator and neutralize with 5 % acetic acid to
2. Referenced Documents an orange color.Add 2 to 3 mLof 5 % potassium chromate and
titrate the solution with 0.1 N silver nitrate. Record the
2.1 ASTM Standards:
millilitre of silver nitrate asA.Titrate 200 mLof distilled water
D 2813 Practice for Sampling Leather for Physical and
containing a few drops of methyl orange indicator and 2 to 3
Chemical Tests
mL of 5 % potassium chromate with 0.1 N silver nitrate as a
3. Significance and Use
blank and the millilitre of silver nitrate used and recorded as B.
3.1 This test method is used to determine amount of soluble
8. Calculation of Results
chlorides in leather.
8.1 Calculate the percent total chlorides as follows:
4. Apparatus
totalchlorides,% 5 ~A 2B!N/W 3 0.0355 3 250/200 3 100 (1)
4.1 Volumetric Flask, 250 mL.
where:
5. Reagents
5.1 Acetic Acid Solutions—5 or 10 % by volume.
A = millilitres of standard silver nitrate used for titrating
5.2 Methyl Orange—0.02 % solution in 50 % alcohol.
the sample,
5.3 Ammonium Hydroxide Solution, (0.1 N).
B = millilitres of standard silver nitrate used for titrating
5.4 Silver Nitrate, Standard Solution, (0.1 N). the blank,
5.5 Potassium Chromate Solution,5%. N = normality of the standard silver nitrate, and
W = weight of the specimen.
6. Sampling, Test Specimens and Test Units
8.2 The total chlorides in the sample for test shall
...