ASTM D8371-20

Standard Test Method for Trace Metal Content Analysis in Carbon Black

SIGNIFICANCE AND USE
5.1 This test covers the quantitation of trace metals in carbon black. The quantitation of heavy metals may help to estimate their contribution to a final finished article. Metal components may impact application properties of final products or may be a regulatory issue. It is the responsibility of the user of the material to consider the impact of the elements when designing a final product.  
5.2 Elements which cannot be digested with nitric acid, such as silicon, cannot be quantified by this test method. This standard describes two digestion methods; microwave acid digestion and furnace ashing. The furnace ashing method may not be appropriate for certain more volatile elements which can be lost during incineration.
SCOPE
1.1 This test method covers the determination of metal content in carbon black with ICP-OES or ICP-MS after adequate digestion. See 3.1.5 – 3.1.7 for definitions.  
1.2 The concentration ranges covered by these test methods are determined by the sensitivity of the instruments, the amount of sample taken for analysis and the dilution volume.  
1.3 Detection limits, sensitivity and optimum ranges of the metals will vary with the matrices and model of spectrometer.  
1.4 Elements present at concentrations above the linear response range of the calibration curve can be determined with additional appropriate dilutions.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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.  
1.7 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: 30-Nov-2020
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.66 - Environment, Health, and Safety

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: D8371 − 20
Standard Test Method for
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Trace Metal Content Analysis in Carbon Black
This standard is issued under the fixed designation D8371; 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 Spectrometry (ICP-AES) for ElementalAnalysis of Petro-
leum Products and Lubricants
1.1 This test method covers the determination of metal
content in carbon black with ICP-OES or ICP-MS after
3. Terminology
adequate digestion. See 3.1.5 – 3.1.7 for definitions.
3.1 Definitions:
1.2 The concentration ranges covered by these test methods
3.1.1 calibration, n—the process by which the relationship
are determined by the sensitivity of the instruments, the
between signal intensity and element concentration is deter-
amount of sample taken for analysis and the dilution volume.
mined for a specific element analysis.
1.3 Detection limits, sensitivity and optimum ranges of the
3.1.2 calibration curve, n—the plot of signal intensity (on
metals will vary with the matrices and model of spectrometer.
the ‘y’ axis) versus element concentration (on the ‘x’ axis)
1.4 Elements present at concentrations above the linear
using data obtained from standards that contain certified trace
response range of the calibration curve can be determined with
metal concentrations (calibration solutions), known with high
additional appropriate dilutions.
accuracy.
1.5 The values stated in SI units are to be regarded as
3.1.3 calibration solution, n—solution containing mixture
standard. No other units of measurement are included in this
of elements of known concentrations (multi element certified
standard.
standard solution).
1.6 This standard does not purport to address all of the
3.1.4 detection limit, n—the concentration of an analyte that
safety concerns, if any, associated with its use. It is the
results in a signal intensity that is some multiple (typically
responsibility of the user of this standard to establish appro-
three) times the standard deviation of the background intensity
priate safety, health, and environmental practices and deter-
of the blank.
mine the applicability of regulatory limitations prior to use.
3.1.5 ICP-MS, n—inductively coupled plasma – mass spec-
1.7 This international standard was developed in accor-
trometry.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 3.1.6 ICP-OES, n—inductively coupled plasma – optical
emission spectrometry.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3.1.7 inductively coupled plasma (ICP), n—a high tempera-
Barriers to Trade (TBT) Committee.
ture discharge generated by flowing an ionizable gas through a
magnetic field induced by a load coil that surrounds the tubes
2. Referenced Documents
carrying the gas.
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2.1 ASTM Standards:
3.1.8 linear response range, n—the elemental concentration
D1193 Specification for Reagent Water
range over which the calibration curve is a straight line, within
D1506 Test Methods for Carbon Black—Ash Content
the precision of the test method.
D7260 Practice for Optimization, Calibration, and Valida-
3.1.9 secondary solution, n—calibration solution from a
tion of Inductively Coupled Plasma-Atomic Emission
second source.
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4. Summary of Test Method
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
Black and is the direct responsibility of Subcommittee D24.66 on Environment,
4.1 A sample of carbon black is digested either with strong
Health, and Safety.
acid under high temperature and pressure or after incineration
Current edition approved Dec. 1, 2020. Published January 2021. DOI: 10.1520/
D8371-20.
of the sample and acid treatment of the ash. By digestion, the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
trace metals are transferred into their soluble salts, and most of
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
the interfering matrix components, that is, carbon black, are
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. removed.
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D8371 − 20
4.2 The digestion solution is measured with an ICP-OES or 6.10 Crucibles, made of porcelain, quartz or platinu
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