ASTM D7967-21

Standard Test Method for Analysis of Chrome Content (as Cr<inf>2</inf>O<inf>3</inf>) in Wet Blue using Atomic Absorption or ICP

SIGNIFICANCE AND USE
5.1 The procedure described is for chromium in Wet Blue using Atomic Absorption or ICP. This method may be used to determine the chromium content in Wet Blue as an alternate to Test Method D6656.  
5.2 The chromium content of Wet Blue is related to the degree of tannage obtained, and hence may be a matter for specification in the purchase of Wet Blue. The procedure described provides adequate accuracy for this purpose.
SCOPE
1.1 This test method covers the Atomic Absorption procedure, using nitrous oxide-acetylene flame, air-acetylene flame or ICP (Inductively coupled plasma) to analyze the chrome content of Wet Blue (and leather) on a moisture-free basis.  
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. Some specific hazards statements are given in Section 9 on Hazards and in 12.5 and 12.20.  
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-Aug-2021
• ICS: 59.140.30 - Leather and furs
• Technical Committee: D31 - Leather
• Drafting Committee: D31.02 - Wet Blue

Relations

• Refers: ASTM D6658-08(2020) - Standard Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying
• Effective Date: 01-Apr-2020

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: D7967 − 21
Standard Test Method for
Analysis of Chrome Content (as Cr O ) in Wet Blue using
2 3
1
Atomic Absorption or ICP
This standard is issued under the fixed designation D7967; 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 D6658 Test Method for Volatile Matter (Moisture) of Wet
Blue by Oven Drying
1.1 This test method covers the Atomic Absorption
E177 Practice for Use of the Terms Precision and Bias in
procedure, using nitrous oxide-acetylene flame, air-acetylene
ASTM Test Methods
flame or ICP (Inductively coupled plasma) to analyze the
E691 Practice for Conducting an Interlaboratory Study to
chrome content of Wet Blue (and leather) on a moisture-free
Determine the Precision of a Test Method
basis.
1.2 The values stated in SI units are to be regarded as
3. Terminology
standard. No other units of measurement are included in this
3.1 Definitions—For definitions of general leather and tan-
standard.
ning terms used in this test method refer to Terminology
1.3 This standard does not purport to address all of the
D1517.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 4. Summary of Test Method
priate safety, health, and environmental practices and deter-
4.1 ThechromiumcontentmeasuredasCr O isdetermined
2 3
mine the applicability of regulatory limitations prior to use.
in Wet Blue using Atomic Absorption (AA) or ICP. The Wet
Some specific hazards statements are given in Section 9 on
Blue is digested using oxalic acid, hydrochloric acid, and
Hazards and in 12.5 and 12.20.
potassium chloride (Option A); or digested using nitric acid
1.4 This international standard was developed in accor-
and sulfuric acid (Option B). The chromium content in Wet
dance with internationally recognized principles on standard-
Blueismeasuredatawavelengthof429nanometerswitha0.7
ization established in the Decision on Principles for the
slit using Atomic Absorption with a nitrous oxide/acetylene
Development of International Standards, Guides and Recom-
flame; or at a wavelength of 357.9 nm with a 0.7 slit for the
mendations issued by the World Trade Organization Technical
air-acetylene flame; or standard operating settings for the ICP.
Barriers to Trade (TBT) Committee.
After theAAreading the chromium content is determined on a
moisture-free basis.
2. Referenced Documents
2
5. Significance and Use
2.1 ASTM Standards:
D1517 Terminology Relating to Leather
5.1 The procedure described is for chromium in Wet Blue
D2813 Practice for Sampling Leather for Physical and
using Atomic Absorption or ICP. This method may be used to
Chemical Tests
determine the chromium content in Wet Blue as an alternate to
D6656 Test Method for Determination of Chromic Oxide in
Test Method D6656.
Wet Blue (Perchloric Acid Oxidation)
5.2 The chromium content of Wet Blue is related to the
D6659 Practice for Sampling and Preparation of Wet Blue
degree of tannage obtained, and hence may be a matter for
and Wet White for Physical and Chemical Tests
specification in the purchase of Wet Blue. The procedure
described provides adequate accuracy for this purpose.
1
6. Interferences
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
6.1 The nitrous oxide/acetylene flame reduces or eliminates
Current edition approved Sept. 1, 2021. Published October 2021. Originally
manychemicalorcompoundinterferencesthatcanoccurifjust
approved in 2016. Last previous edition approved in 2016 as D7967–16. DOI:
10.1520/D7967-21.
an air/acetylene flame is used, however, sensitivity may be
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
reduced. Use of the ionization suppressant solution is recom-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
mended when the iron content of the sample is expected to be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. high.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7967 − 21
7. Apparatus 8.10 Wet Blue Digestion Mixture.
7.1 Atomic Absorption Analyzer, using a nitrous oxide-
NOTE 2—Wet Blue digestion mixture must be prepared in a fume or
acetylene flame measuring at a wavelength of 429 nano
...

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: D7967 − 16 D7967 − 21
Standard Test Method for
Analysis of Chrome Content (as Cr O ) in Wet Blue using
2 3
1
Atomic Absorption or ICP
This standard is issued under the fixed designation D7967; 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 Atomic Absorption procedure, using nitrous oxide-acetylene flame, air-acetylene flame or ICP
(Inductively coupled plasma) to analyze the chrome content of Wet Blue (and leather) on a moisture-free basis.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. Some specific hazards statements are given in Section 9 on Hazards and in 12.5
and 12.20.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1517 Terminology Relating to Leather
D2813 Practice for Sampling Leather for Physical and Chemical Tests
D6656 Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
D6659 Practice for Sampling and Preparation of Wet Blue and Wet White for Physical and Chemical Tests
D6658 Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions: Definitions—For Definitionsdefinitions of general leather and tanning terms used in this test method refer to
Terminology D1517.
4. Summary of Test Method
4.1 The chromium content measured as Cr O is determined in Wet Blue using Atomic Absorption (AA). (AA) or ICP. The Wet
2 3
1
This test method is under the jurisdiction of ASTM Committee D31 on Leather and is the direct responsibility of Subcommittee D31.02 on Wet Blue.
Current edition approved Sept. 1, 2016Sept. 1, 2021. Published October 2016October 2021. Originally approved in 2016. Last previous edition approved in 2016 as
D7967–16. DOI: 10.1520/D7967-16.10.1520/D7967-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7967 − 21
Blue is digested using oxalic acid, hydrochloric acid, and potassium chloride. chloride (Option A); or digested using nitric acid
and sulfuric acid (Option B). The chromium content in Wet Blue is measured at a wavelength of 429 nanometers with a 0.7 slit
using Atomic Absorption with a nitrous oxide/acetylene flame. flame; or at a wavelength of 357.9 nm with a 0.7 slit for the
air-acetylene flame; or standard operating settings for the ICP. After the AA reading the chromium content is determined on a
moisture-free basis.
5. Significance and Use
5.1 The procedure described is for chromium in Wet Blue using Atomic Absorption. Absorption or ICP. This method may be used
to determine the chromium content in Wet Blue as an alternate to Test Method D6656.
5.2 The chromium content of Wet Blue is related to the degree of tannage obtained, and hence may be a matter for specification
in the purchase of Wet Blue. The procedure described provides adequate accuracy for this purpose.
6. Interferences
6.1 The nitrous oxide/acetylene flame reduces or eliminates many chemical or compound interferences that can occur if just an
air/acetylene flame is used, however, sensitivity may be reduced. Use of the ionization suppressant solution is recommended when
the iron cont
...