ASTM D6716-08(2020)
(Test Method)Standard Test Method for Total Ash in Wet Blue or Wet White
Standard Test Method for Total Ash in Wet Blue or Wet White
SIGNIFICANCE AND USE
5.1 This test method is useful in determining the approximate amount of nonvolatile inorganic material in wet blue. This may be in the form of salts or oxides of the elements. In a mixed-chrome tannage, the approximate percentage of other elements in the wet blue may be determined by subtracting the chromic oxide that may be conveniently determined on the ash. (See Test Method D6714.)
5.2 The specified temperature of 600°C is high enough to produce a reproducible result but it does not completely dehydrate such oxides as aluminum oxide (Al2O3) and chromic oxide (Cr2O3). Likewise, such salts as sulfates and phosphates may be incompletely dehydrated, and if alkalis and chromium are present simultaneously, oxidation to chromate may occur. Therefore, caution is advised in drawing conclusions based on quantitative relations of the elements.
SCOPE
1.1 This test method covers the determination of total ash in wet blue and wet white.
1.2 For total ash in wet white, the procedure is identical; substitute wet white for wet blue in the standard.
1.3 Total ash in wet blue may be reported upon a number of different bases (for example, fat-free, moisture-free, as received, excluding chromium, and so forth). Before proceeding with any tests, it is very important to determine upon which basis that the total ash is to be reported and to identify all other test methods that will be required to be executed in order to achieve the determined reporting method.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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.
1.6 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
Relations
Standards Content (Sample)
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: D6716 − 08 (Reapproved 2020)
Standard Test Method for
Total Ash in Wet Blue or Wet White
This standard is issued under the fixed designation D6716; 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 D6714 Test Method for Chromic Oxide in Ashed Wet Blue
(Perchloric Acid Oxidation)
1.1 This test method covers the determination of total ash in
wet blue and wet white.
3. Terminology
1.2 For total ash in wet white, the procedure is identical;
3.1 Definitions:
substitute wet white for wet blue in the standard.
3.1.1 The terms and definitions employed within this test
1.3 Total ash in wet blue may be reported upon a number of
method are commonly used in normal laboratory practice and
different bases (for example, fat-free, moisture-free, as
require no special comment.
received, excluding chromium, and so forth). Before proceed-
ingwithanytests,itisveryimportanttodetermineuponwhich
4. Summary of Test Method
basis that the total ash is to be reported and to identify all other
4.1 Theweighedsampleisignitedinairat600 625°Cuntil
test methods that will be required to be executed in order to
constant mass is attained. The weighed residual matter is
achieve the determined reporting method.
termed “ash” and is calculated as a percentage of the original
1.4 The values stated in SI units are to be regarded as
sample.
standard. No other units of measurement are included in this
5. Significance and Use
standard.
1.5 This standard does not purport to address all of the
5.1 This test method is useful in determining the approxi-
safety concerns, if any, associated with its use. It is the mate amount of nonvolatile inorganic material in wet blue.
responsibility of the user of this standard to establish appro-
This may be in the form of salts or oxides of the elements. In
priate safety, health, and environmental practices and deter- a mixed-chrome tannage, the approximate percentage of other
mine the applicability of regulatory limitations prior to use.
elements in the wet blue may be determined by subtracting the
1.6 This international standard was developed in accor- chromicoxidethatmaybeconvenientlydeterminedontheash.
dance with internationally recognized principles on standard-
(See Test Method D6714.)
ization established in the Decision on Principles for the
5.2 The specified temperature of 600°C is high enough to
Development of International Standards, Guides and Recom-
produce a reproducible result but it does not completely
mendations issued by the World Trade Organization Technical
dehydratesuchoxidesasaluminumoxide(Al O )andchromic
2 3
Barriers to Trade (TBT) Committee.
oxide (Cr O ). Likewise, such salts as sulfates and phosphates
2 3
may be incompletely dehydrated, and if alkalis and chromium
2. Referenced Documents
are present simultaneously, oxidation to chromate may occur.
2.1 ASTM Standards:
Therefore, caution is advised in drawing conclusions based on
D3495 Test Method for Hexane Extraction of Leather
quantitative relations of the elements.
D6658 Test Method for Volatile Matter (Moisture) of Wet
Blue by Oven Drying
6. Apparatus
D6659 Practice for Sampling and Preparation of Wet Blue
6.1 Crucible, 30- to 50-mL, high-form, platinum or porce-
and Wet White for Physical and Chemical Tests
lain.
6.2 Electric Muffle Furnace, with controller or rheostat and
This test method is under the jurisdiction ofASTM Committee D31 on Leather
pyrometer, capable of maintaining a temperature of 600 6
and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
Current edition approved April 1, 2020. Published April 2020. Originally 25°C.
approved in 2001. Last previous edition approved in 2013 as D6716 – 08(2013).
6.3 Dessicator, of appropriate size and charged with fresh
DOI: 10.1520/D6716-08R20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or dessicant.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.4 Analytical Balance, capable of accurate weighings to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. within 0.001 g.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6716 − 08 (2020)
minutes, and filter the suspension through an ashless high-retention filter
7. Test Specimen
paper. Transfer the paper and insoluble residue to the crucible and ignite
7.1 The specimen shall consist of 2 to 10 g of wet blue from
at 600 6 25°C as described above. Cool, add the filtrate to the crucible,
the composite sample, prepared in accordance with Practice
evaporate carefully to dryness, then ignite at 600 6 25°C to constant mass
as described previously.
D6659.
NOTE 1—Typicall
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.