ASTM D5356-10(2015)
(Test Method)Standard Test Method for pH of Chrome Tanning Solutions
Standard Test Method for pH of Chrome Tanning Solutions
SIGNIFICANCE AND USE
5.1 This test method is designed to measure the pH of a chrome tanning solution which has been diluted to a specific concentration. This is considered to be a measure of the acidity or alkalinity of the solution.
5.2 This test method is suitable for quality control in the manufacture of leather.
SCOPE
1.1 This test method covers the determination of the pH of chrome tanning solutions.
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
Relations
Buy Standard
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D5356 − 10 (Reapproved 2015)
Standard Test Method for
pH of Chrome Tanning Solutions
This standard is issued under the fixed designation D5356; 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 standard shall be governing except where the text of this test
method specifically deviates.
1.1 This test method covers the determination of the pH of
chrome tanning solutions.
5. Significance and Use
1.2 The values stated in SI units are to be regarded as
5.1 This test method is designed to measure the pH of a
standard. No other units of measurement are included in this
chrome tanning solution which has been diluted to a specific
standard.
concentration.This is considered to be a measure of the acidity
1.3 This standard does not purport to address all of the
or alkalinity of the solution.
safety concerns, if any, associated with its use. It is the
5.2 This test method is suitable for quality control in the
responsibility of the user of this standard to establish appro-
manufacture of leather.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Apparatus
2. Referenced Documents
6.1 pH Meter, either battery or line-operated equipped with
appropriate electrodes. The meter shall have a maximum scale
2.1 ASTM Standards:
division of 0.1 pH unit and reproducibility of 0.05 pH unit.
D3898 Test Method for Chromic Oxide in Basic Chromium
Tanning Liquors
NOTE 1—Sellers list reasonably priced models having more sensitivity
E70 Test Method for pH of Aqueous Solutions With the and greater reproducibility.
Glass Electrode
7. Reagents
3. Terminology
7.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
3.1 Definitions of Terms Specific to This Standard:
all reagents shall conform to the specifications of the Commit-
3.1.1 pH, of a solution—the negative logarithm of the
tee onAnalytical Reagents of theAmerican Chemical Society,
hydrogen ion activity.
where such specifications are available. Other grades may be
3.1.1.1 Discussion—A solution of pH 7 is neutral at 24°C.
used, provided it is first ascertained that the reagent is of
Lower numbers indicate increasing acidity, higher numbers
sufficiently high purity to permit its use without lessening the
indicate increasing alkalinity.
accuracy of the determination.
4. Summary of Test Method
7.2 Purity of Water—Unless otherwise indicated, references
4.1 The chrome tanning liquor is diluted to a concentration to water shall be understood to mean distilled water or water of
equal purity.
of 25.0 6 0.5 g chromic oxide equivalent per litre, allowed to
come to equilibrium and the pH is then measured with the
7.3 Buffer Solutions—Commercially available buffer solu-
appropriate meter. For general details of a procedure, Test
tions of 2.00 6 0.02 pH and 4.00 6 0.02 pH shall be used for
Method E70 should be consulted. The provisions of the
meter standardization, in accordance with the manufacturer’s
recommendations and the provisions set forth in Test Method
E70.
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.06 on Chemical Analysis
Current edition approved Dec. 1, 2015. Published December 2015. Originally
approved in 1993. Last previous edition approved in 2010 as D5356 – 10. DOI: Reagent Chemicals, American Chemical Society Specifications , American
10.1520/D5356-10R15. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5356 − 10 D5356 − 10 (Reapproved 2015)
Standard Test Method for
pH of Chrome Tanning Solutions
This standard is issued under the fixed designation D5356; 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
1.1 This test method covers the determination of the pH of chrome tanning solutions.
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.
2. Referenced Documents
2.1 ASTM Standards:
D3898 Test Method for Chromic Oxide in Basic Chromium Tanning Liquors
E70 Test Method for pH of Aqueous Solutions With the Glass Electrode
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 pH, of a solution—the negative logarithm of the hydrogen ion activity.
This test method is under the jurisdiction of ASTM Committee D31 on Leather and is the direct responsibility of Subcommittee D31.06 on Chemical Analysis
Current edition approved Nov. 1, 2010Dec. 1, 2015. Published November 2010December 2015. Originally approved in 1993. Last previous edition approved in 20092010
as D5356 – 93 (2009).D5356 – 10. DOI: 10.1520/D5356-10.10.1520/D5356-10R15.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3.1.1.1 Discussion—
A solution of pH 7 is neutral at 24°C. Lower numbers indicate increasing acidity, higher numbers indicate increasing alkalinity.
4. Summary of Test Method
4.1 The chrome tanning liquor is diluted to a concentration of 25.0 6 0.5 g chromic oxide equivalent per litre, allowed to come
to equilibrium and the pH is then measured with the appropriate meter. For general details of a procedure, Test Method E70 should
be consulted. The provisions of the standard shall be governing except where the text of this test method specifically deviates.
5. Significance and Use
5.1 This test method is designed to measure the pH of a chrome tanning solution which has been diluted to a specific
concentration. This is considered to be a measure of the acidity or alkalinity of the solution.
5.2 This test method is suitable for quality control in the manufacture of leather.
6. Apparatus
6.1 pH Meter, either battery or line-operated equipped with appropriate electrodes. The meter shall have a maximum scale
division of 0.1 pH unit and reproducibility of 0.05 pH unit.
NOTE 1—Sellers list reasonably priced models having more sensitivity and greater reproducibility.
7. Reagents
7.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5356 − 10 (2015)
such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
7.2 Purity of Water—Unless otherwise indicated, references to water shall be understood to mean distilled water or water of
equal purity.
7.3 Buffer Solutions—Commercially available buffer solutions of 2.00 6 0.02 pH and 4.00 6 0.02 pH shall be used for meter
standardization, in accordance with the manufacturer’s recommendations and the provisions set forth in Test Method E70.
8. Standardization
8.1 Standardize the meter against the pH 4.00 standard, in accordance with the manufacturer’s recommendations and the
provisions set forth in Test Method E70. The buffer standa
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.