Standard Test Method for Calculation of Unfixed Chrome Concentration in Wet Blue

SIGNIFICANCE AND USE
5.1 This test method measures the amount of unfixed chrome in Wet Blue. Results may vary according to the age of the Wet Blue.
SCOPE
1.1 This test method covers the procedures to analyze and calculate unfixed chrome concentrations in Wet Blue.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Mar-2022
Technical Committee
Drafting Committee
Current Stage
Ref Project

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ASTM D8451-22 - Standard Test Method for Calculation of Unfixed Chrome Concentration in Wet Blue
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D8451 −22
Standard Test Method for
1
Calculation of Unfixed Chrome Concentration in Wet Blue
This standard is issued under the fixed designation D8451; 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. Summary of Test Method
1.1 This test method covers the procedures to analyze and 4.1 Thesampleissoaked,static,indeionizedwaterfor20to
calculate unfixed chrome concentrations in Wet Blue. 24 h. After 20 to 24 h of static soaking, the mixture is
thoroughly mixed, an aliquot filtered (and diluted) if necessary,
1.2 The values stated in SI units are to be regarded as
is analyzed for unfixed chrome content. Atomic Absorption
standard. No other units of measurement are included in this
Spectrophotometers using the nitrous oxide/acetylene flame or
standard.
the air/acetylene flame are acceptable to use for the analysis.
1.3 This standard does not purport to address all of the
Analysis by the ICP (Inductively Coupled Plasma) method is
safety concerns, if any, associated with its use. It is the
also acceptable.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5. Significance and Use
mine the applicability of regulatory limitations prior to use.
5.1 This test method measures the amount of unfixed
1.4 This international standard was developed in accor-
chrome in Wet Blue. Results may vary according to the age of
dance with internationally recognized principles on standard-
the Wet Blue.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
6. Apparatus
mendations issued by the World Trade Organization Technical
6.1 Leather Cutting Tool.
Barriers to Trade (TBT) Committee.
6.2 Styrofoam Cup, or 250 mL beaker.
2. Referenced Documents
6.3 Beaker, 250 mL capacity or equivalent.
2
2.1 ASTM Standards:
6.4 Beaker, 1000 mL capacity or equivalent.
D6658 Test Method for Volatile Matter (Moisture) of Wet
6.5 Volumetric Flask, 200 mL capacity or equivalent.
Blue by Oven Drying
D6659 Practice for Sampling and Preparation of Wet Blue
6.6 Volumetric Flask, 1000 mL capacity or equivalent.
and Wet White for Physical and Chemical Tests
6.7 Stirring Rod.
E177 Practice for Use of the Terms Precision and Bias in
6.8 Magnetic Stirrer.
ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to
6.9 Atomic Absorption Spectrophotometer.
Determine the Precision of a Test Method
6.10 ICP.
6.11 Scale, accurate to 0.0001 g.
3. Terminology
6.12 Filter Paper, Whatman 1 or equivalent.
3.1 Definitions:
3.1.1 unfixed chrome, n—chrome that is not chemically
6.13 Hot Plate, to be placed inside exhaust or fume hood.
bound to hide substance and may be removed by water
extraction.
7. Reagents and Materials
7.1 Purity of Reagents—Analytical Reagent (AR) Grade
shall be used in all tests. Unless otherwise indicated, it is
1
This test method is under the jurisdiction ofASTM Committee D31 on Leather
intended that all reagents conform to the specifications of the
and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
Committee on Analytic Reagents of the American Chemical
Current edition approved April 1, 2022. Published May 2022. DOI: 10.1520/
D8451-22.
Society (ACS), where such specifications are available. Other
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
grades may be used, provided it is first ascertained that the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
reagent is of sufficiently high purity to permit its use without
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. lessening the accuracy of determination.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D8451−22
NOTE 4—Prepare the 10 ppm and 25 ppm Cr O standard solutions
7.2 Commercial Reagents—The use of commercially avail-
2 3
fresh daily (on day of use).
able pre-standardized analytical reagents and solutions is
appropriate, providing those reagents and solutions have been
7.11 Calibration and Standardization—Nitrous oxide/
prepared in accordance with and conform to the previously
acetylene flame.
mentioned specifications (see 7.1).
7.11.1 Optimize the Atomic Absorption Spectrophotometer
according to the following instrumental parameter
...

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