ASTM E372-21

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: E372 − 21
Standard Test Method for
Determination of Calcium and Magnesium in Magnesium
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Ferrosilicon by EDTA Titrimetry
This standard is issued under the fixed designation E372; 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 for Determination of Chemical Composition
E50 Practices for Apparatus, Reagents, and Safety Consid-
1.1 This test method covers the chemical analysis of mag-
erations for Chemical Analysis of Metals, Ores, and
nesium ferrosilicon having chemical compositions within the
Related Materials
following limits:
E135 Terminology Relating to Analytical Chemistry for
Element Composition Range, %
Metals, Ores, and Related Materials
Aluminum 2.0 max E173 Practice for Conducting Interlaboratory Studies of
Calcium 0.25 to 3.00
Methods for Chemical Analysis of Metals (Withdrawn
Carbon 0.50 max
3
1998)
Cerium 1.0 max
Chromium 0.50 max
Magnesium 2.00 to 12.00
3. Terminology
Manganese 1.0 max
3.1 For definitions of terms used in this test method, refer to
Silicon 40.00 to 55.00
Sulfur 0.025 max
Terminology E135.
Titanium 0.2 max
1.2 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 This test method for the chemical analysis of metals and
responsibility of the user of this standard to establish appro-
alloys is primarily intended to test such materials for compli-
priate safety, health, and environmental practices and deter-
ance with compositional specifications. It is assumed that all
mine the applicability of regulatory limitations prior to use.
who use this test method will be trained analysts capable of
For general precautions to be observed in this test method,
performing common laboratory procedures skillfully and
refer to Practices E50.
safely. It is expected that work will be performed in a properly
1.3 This international standard was developed in accor-
equipped laboratory.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Hazards
Development of International Standards, Guides and Recom-
5.1 For precautions to be observed in the use of certain
mendations issued by the World Trade Organization Technical
reagents and equipment in this test method, refer to Practices
Barriers to Trade (TBT) Committee.
E50.
2. Referenced Documents
5.2 Specific hazard statements are given in 13.7.1 and 14.1.
2
2.1 ASTM Standards:
6. Sampling
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
6.1 For procedures to sample the material, refer to Practices
E32 Practices for Sampling Ferroalloys and Steel Additives
E32.
7. Rounding Calculated Values
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This test method is under the jurisdiction of ASTM Committee E01 on
7.1 Rounding of test results obtained using this test method
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
shall be performed as directed in Practice E29, Rounding
responsibility of Subcommittee E01.01 on Iron, Steel, and Ferroalloys.
Current edition approved Jan. 15, 2021. Published February 2021. Originally
Method, unless an alternative rounding method is specified by
approved in 1976. Redesignated E372 in 1980. Last previous edition approved in
the customer or applicable material specification.
2013 as E372 – 13. DOI: 10.1520/E0372-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
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E372 − 21
8. Interlaboratory Studies to a 250 mL beaker, add 1 mL of MgCl (13.6) solution and
2
100 mL of water, and proceed as directed in 14.4.
8.1 This test method has been evaluated in accordance with
13.3.3 Calculate the calcium equivalent of the EDTA solu-
Practice E173, unless otherwise noted in the precision and bias
tion as follows:
section.
Calcium equivalent, mg/mL 5 A/B (1)
where:
CALCIUM AND MAGNESIUM BY THE
(ETHYLENEDINITRILO) TETRAACETIC ACID
A = calcium, mg, and
DISODIUM SALT (EDTA) TITRIMETRY METHOD B = EDTA solution required to titrate t
...