ASTM D4655-95(2012)

Standard Test Methods for Sulfates in Leather (Total, Neutral, and Combined Acid)

SIGNIFICANCE AND USE
These test methods are used to determine the basicity of leather when used in accordance with Test Method D4654.
SCOPE
1.1 These test methods are intended for use in determining the total, neutral, and combined acid sulfate in mineral-tanned leather.
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-2012
• ICS: 59.140.30 - Leather and furs
• Technical Committee: D31 - Leather
• Drafting Committee: D31.06 - Chemical Analysis

Relations

• Replaces: ASTM D4655-95(2006) - Standard Test Methods for Sulfates in Leather (Total, Neutral, and Combined Acid)
• Effective Date: 01-Apr-2012
• Referred By: ASTM D4654-87(2020) - Standard Test Method for Sulfate Basicity in Leather
• Effective Date: 01-Apr-2012

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D4655 − 95 (Reapproved 2012)
Standard Test Methods for
Sulfates in Leather (Total, Neutral, and Combined Acid)
This standard is issued under the fixed designation D4655; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope gen phosphate, 0.1 molar solution (13.6 g/L KH PO)or
2 4
sodium dihydrogen phosphate, 0.1 molar solution (13.8 g/ L
1.1 These test methods are intended for use in determining
NaH PO -H O).
2 4 2
the total, neutral, and combined acid sulfate in mineral-tanned
leather. 5.2 HydrochloricAcidSolution, (1.5N)—125 mL/Lreagent
grade concentrate hydrochloric acid.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this 5.3 Barium Chloride Solution—(BaCl ·2H O), 1 %.
2 2
standard.
5.4 Sodium Hydroxide Solution, 0.01 N, 0.4 g/L.
1.3 This standard does not purport to address all of the
5.5 MixedIndicator,consistingof60mLofa0.1 %solution
safety concerns, if any, associated with its use. It is the
ofmethylredand40mLofa0.1 %solutionofmethyleneblue,
responsibility of the user of this standard to establish appro-
both in 95 % alcohol.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Sampling, Test Specimens, and Test Units
6.1 The specimen for each determination shall consist of 1
2. Referenced Documents
g leather from the composite sample (See Practice D2813).
2.1 ASTM Standards:
6.2 Two specimens from the composite sample shall be
D2813 Practice for Sampling Leather for Physical and
tested for each determination.
Chemical Tests
D4654 Test Method for Sulfate Basicity in Leather
7. Procedure
3. Significance and Use
7.1 Total Sulfates—Weigh the specimen to the nearest mil-
3.1 These test methods are used to determine the basicity of ligram and record the value as W . Transfer the specimen to a
leather when used in accordance with Test Method D4654. 250-mL volumetric flask and add 200 mL of 0.1 N ammonium
hydroxide or 0.1 molar potassium or sodium dihydrogen
4. Apparatus
phosphate solution. Immerse the flask up to the neck in a bath
of boiling water. Thoroughly wet all products by swirling
4.1 Volumetric Flask, 250 mL.
occasionally.After 2 h cool the flask to room temperature, and
4.2 Filter paper, ashless, fine grained and porcelain crucible.
make up to volume with distilled water, shake, and without
4.3 Crucible, Gooch, with porous porcelain filter (optional).
delay filter through a folded filter paper. Discard the first 20 to
25 mL of the filtrate. Pipette 200 mL of the filtrate into a 600
5. Reagents
mL beaker and add about 20 mL of 1.5 N hydrochloric acid.
5.1 Ammonium Hydroxide Solution, (0.1 N)—7 mL/L re-
Heat the solution to boiling and while boiling and stirring the
agentgradeconcentrateNH OH.Optional:Potassiumdihydro-
4 solution, add 20 mL of a 1 % solution of barium chloride
dropwise. Keep the covered beaker in a warm place at least for
1 2 h and preferably overnight.
These test methods are under the jurisdiction of ASTM Committee D31 on
Leather and are the direct responsibility of Subcommittee D31.06 on Chemical
7.1.1 Filter the precipitate through a fine grained ashless
Analysis.Thistestmethodwas developed in cooperation with theAmericanLeather
filter paper and wash with hot water until free from chloride.A
Chemists Assn. (Method D20–1956).
weighed Gooch crucible or a weighed porous crucible may be
Current edition approved April 1, 2012. Published April 2012. Originally
used as an alternative for the filtration. Transfer the paper with
approved in 1987. Last previous edition approved in 2006 as D4655–95 (2006).
DOI: 10.1520/D4655-95R12.
the precipitate to a weighed crucible and ignite gently, either
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
over a gas burner or in a muffle oven at 900°C for 1 h. Cool the
contact ASTM Customer Service at [e-mail]. For
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