ASTM E246-21

Standard Test Methods for Determination of Iron in Iron Ores and Related Materials by Dichromate Titrimetry

SIGNIFICANCE AND USE
3.1 The determination of the total iron content is the primary means for establishing the commercial value of iron ores used in international trade.  
3.2 These test methods are intended as referee methods for the determination of iron in iron ores. It is assumed that all who use these test methods will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be followed. Appropriate quality control practices must be followed, such as those described in Guide E882.
SCOPE
1.1 These test methods cover the determination of total iron in iron ores, concentrates, and agglomerates in the concentration range 30 % to 95 % iron.  
1.2 The test methods in this standard are contained in the sections indicated as follows:    
Test Method A— Iron by the Hydrogen Sulfide Reduction Dichromate Titration Method (30 % to 75 % Fe)  
Test Method B—Iron by the Stannous Chloride Reduction Dichromate Titration Method (35 % to 95 % Fe)  
Test Method C—Iron by the Silver Reduction Dichromate Titration Method (35 % to 95 % Fe)  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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. Specific hazards statements are given in Section 5 and in special “Warning” paragraphs throughout these test methods.  
1.5 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-Sep-2021
• ICS: 73.060.10 - Iron ores
• Technical Committee: E01 - Analytical Chemistry for Metals, Ores, and Related Materials
• Drafting Committee: E01.02 - Ores, Concentrates, and Related Metallurgical Materials

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: E246 − 21
Standard Test Methods for
Determination of Iron in Iron Ores and Related Materials by
1
Dichromate Titrimetry
This standard is issued under the fixed designation E246; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E29Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.1 These test methods cover the determination of total iron
E50Practices for Apparatus, Reagents, and Safety Consid-
in iron ores, concentrates, and agglomerates in the concentra-
erations for Chemical Analysis of Metals, Ores, and
tion range 30% to 95% iron.
Related Materials
1.2 The test methods in this standard are contained in the
E276TestMethodforParticleSizeorScreenAnalysisatNo.
sections indicated as follows:
4 (4.75-mm) Sieve and Finer for Metal-Bearing Ores and
Test Method A— Iron by the Hydrogen Sulfide Reduction Dichromate
Related Materials
Titration Method (30% to 75% Fe)
E691Practice for Conducting an Interlaboratory Study to
Test Method B—Iron by the Stannous Chloride Reduction Dichromate Determine the Precision of a Test Method
Titration Method (35% to 95% Fe)
E877Practice for Sampling and Sample Preparation of Iron
Ores and Related Materials for Determination of Chemi-
Test Method C—Iron by the Silver Reduction Dichromate Titration
Method (35% to 95% Fe)
cal Composition and Physical Properties
E882Guide for Accountability and Quality Control in the
1.3 The values stated in SI units are to be regarded as
Chemical Analysis Laboratory
standard. No other units of measurement are included in this
E1028Test Method for Total Iron in Iron Ores and Related
standard.
3
Materials by Dichromate Titrimetry (Withdrawn 2003)
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Significance and Use
responsibility of the user of this standard to establish appro-
3.1 The determination of the total iron content is the
priate safety, health, and environmental practices and deter-
primary means for establishing the commercial value of iron
mine the applicability of regulatory limitations prior to use.
ores used in international trade.
Specific hazards statements are given in Section 5 and in
special “Warning” paragraphs throughout these test methods.
3.2 These test methods are intended as referee methods for
1.5 This international standard was developed in accor- thedeterminationofironinironores.Itisassumedthatallwho
dance with internationally recognized principles on standard-
use these test methods will be trained analysts capable of
ization established in the Decision on Principles for the
performing common laboratory procedures skillfully and
Development of International Standards, Guides and Recom-
safely. It is expected that work will be performed in a properly
mendations issued by the World Trade Organization Technical
equipped laboratory and that proper waste disposal procedures
Barriers to Trade (TBT) Committee.
will be followed.Appropriate quality control practices must be
followed, such as those described in Guide E882.
2. Referenced Documents
2
2.1 ASTM Standards: 4. Apparatus, Reagents, and Instrumental Practices
D1193Specification for Reagent Water
4.1 Apparatus—Specialized apparatus requirements are
listed in the “Apparatus” Section in each test method.
1
These test methods are under the jurisdiction of ASTM Committee E01 on
4.2 Reagents:
Analytical Chemistry for Metals, Ores, and Related Materials and are the direct
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
4.2.1 Purity of Reagents—Reagent grade chemicals shall be
lurgical Materials.
used in all tests. Unless otherwise indicated, it is intended that
Current edition approved Oct. 1, 2021. Published October 2021. Originally
all reagents conform to the specifications of the Committee on
approvedin1964.Lastpreviouseditionapprovedin2015asE246–10(2015).DOI:
10.1520/E0246-21. Analytical Reagents of theAmerican Chemical Society where
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
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.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959.
...

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: E246 − 10 (Reapproved 2015) E246 − 21
Standard Test Methods for
Determination of Iron in Iron Ores and Related Materials by
1
Dichromate Titrimetry
This standard is issued under the fixed designation E246; 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 These test methods cover the determination of total iron in iron ores, concentrates, and agglomerates in the concentration range
30 % to 95 % iron.
1.2 The test methods in this standard are contained in the sections indicated as follows:
Test Method A— Iron by the Hydrogen Sulfide Reduction Dichromate
Titration Method (30 % to 75 % Fe)
Test Method B—Iron by the Stannous Chloride Reduction Dichromate
Titration Method (35 % to 95 % Fe)
Test Method C—Iron by the Silver Reduction Dichromate Titration
Method (35 % to 95 % Fe)
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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. Specific hazards statements are given in Section 5 and in special “Warning”
paragraphs throughout these test methods.
1.5 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:
D1193 Specification for Reagent Water
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
1
These test methods are under the jurisdiction of ASTM Committee E01 on Analytical Chemistry for Metals, Ores, and Related Materials and are the direct responsibility
of Subcommittee E01.02 on Ores, Concentrates, and Related Metallurgical Materials.
Current edition approved Aug. 15, 2015Oct. 1, 2021. Published August 2015October 2021. Originally approved in 1964. Last previous edition approved in 20102015 as
E246 – 10.E246 – 10(2015). DOI: 10.1520/E0246-10R15.10.1520/E0246-21.
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

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E246 − 21
E276 Test Method for Particle Size or Screen Analysis at No. 4 (4.75-mm) Sieve and Finer for Metal-Bearing Ores and Related
Materials
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E877 Practice for Sampling and Sample Preparation of Iron Ores and Related Materials for Determination of Chemical
Composition and Physical Properties
E882 Guide for Accountability and Quality Control in the Chemical Analysis Laboratory
3
E1028 Test Method for Total Iron in Iron Ores and Related Materials by Dichromate Titrimetry (Withdrawn 2003)
3. Significance and Use
3.1 The determination of the total iron content is the primary means for establishing the commercial value of iron ores used in
international trade.
3.2 These test methods are intended as referee methods for the determination of iron in iron ores. It is assumed that all who use
these test methods will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected
that work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be followed.
Appropriate quality control practices must be followed, such as those described in Guide E882.
4. Apparatus, Reagents, and Instrumental Practices
4.1 Apparatus—Specialized apparatus requirements are listed in the “Apparatus” Section in each test method.
4.
...