ASTM E1941-10

This document is not anASTM standard and is intended only to provide the user of anASTM 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:E1941–04 Designation:E1941–10
Standard Test Method for
Determination of Carbon in Refractory and Reactive Metals
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and Their Alloys by Combustion Analysis
This standard is issued under the fixed designation E1941; 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
1.1This test method applies to the determination of carbon in refractory and reactive metals and their alloys in concentrations
from 0.004 to 0.100% (see
1.1 This test method applies to the determination of carbon in refractory and reactive metals and their alloys in quantities from
20 µg to 500 µg. This corresponds to mass fractions ranging from 0.004 wt % to 0.100 wt % for a 0.5 g sample (see Note 1).
NOTE1—Actual instrument range might vary from manufacturer to manufacturer and according to sample size. 1—Actual quantitative range might
vary from manufacturer to manufacturer and according to sample mass. Samples of higher mass may allow for proportionally lower detection limits
provided complete combustion of the sample is assured.
1.2 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. Specific precautionary statements are given in Section 89.
2. Referenced Documents
2.1 ASTM Standards:
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E29Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications ASTM Standards:
E50 PracticesforApparatus,Reagents,andSafetyConsiderationsforChemicalAnalysisofMetals,Ores,andRelatedMaterials
E55Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical Composition
E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
E1601 Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
E456Terminology Relating to Quality and Statistics
E1019Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by
Various Combustion and Fusion Techniques Practice for Conducting an Interlaboratory Study to Evaluate the Performance of
an Analytical Method
3. Summary of Test Method
3.1The metal specimen, contained in a single-use ceramic crucible, is ignited in an oxygen atmosphere in an induction furnace.
The carbon in the specimen is oxidized to carbon dioxide or carbon monoxide, or both, and is eventually carried to the
analyzer/detector. The amount of carbon present is electronically processed and is displayed by the analyzer readout.
3.2This test method is written for use with commercially available analyzers equipped to carry out the above operations and
calibrated using commercially available standards of known carbon content. Terminology
3.1 Definitions—For definitions of terms used in this test method, see Terminology E135.
4. Significance and Use
4.1This test method is intended to test for compliance with compositional specifications. It is assumed that all who use this
method will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that the
work will be performed in a properly equipped laboratory. Summary of Test Method
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This test method is under the jurisdiction of ASTM Committee E01 on Analytical Chemistry for Metals, Ores, and Related Materials and is the direct responsibility of
Subcommittee E01.06 on Titanium, Zirconium, Tungsten, Molybdenum, Tantalum, Niobium, Hafnium, and Rhenium.
Current edition approved May 1, 2004. Published June 2004. Originally approved in 1998. Last previous edition approved in 1998 as E1941–98. DOI:
10.1520/E1941-04.on Ti, Zr, W, Mo, Ta, Nb, Hf, Re.
Current edition approved Dec. 1, 2010. Published February 2011. Originally approved in 1998. Last previous edition approved in 2004 as E1941 – 04. DOI:
10.1520/E1941-10.
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For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
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