ASTM E738-20
(Test Method)Standard Test Method for Determination of Aluminum in Iron Ores and Related Materials by EDTA Complexometric Titrimetry
Standard Test Method for Determination of Aluminum in Iron Ores and Related Materials by EDTA Complexometric Titrimetry
SIGNIFICANCE AND USE
5.1 This test method for the analysis of iron ore concentrates and agglomerates is primarily intended as a referee method to test for compliance with compositional specifications. It is assumed that all who use this test method 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 shall be followed, such as those described in Guide E882.
SCOPE
1.1 This test method2 covers the determination of aluminum in iron ores, concentrates, and agglomerates in the compositional range from 0.25 % to 5 % aluminum.
Note 1: As used in this test method (except as related to the term relative standard deviation), “percent” or “%” refers to mass fraction (mass/mass) of the form g/100 g.
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.
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
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: E738 − 20
Standard Test Method for
Determination of Aluminum in Iron Ores and Related
1
Materials by EDTA Complexometric Titrimetry
This standard is issued under the fixed designation E738; 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 E135 Terminology Relating to Analytical Chemistry for
2 Metals, Ores, and Related Materials
1.1 This test method covers the determination of aluminum
E877 Practice for Sampling and Sample Preparation of Iron
in iron ores, concentrates, and agglomerates in the composi-
Ores and Related Materials for Determination of Chemi-
tional range from 0.25 % to 5 % aluminum.
cal Composition and Physical Properties
NOTE 1—As used in this test method (except as related to the term
E882 Guide for Accountability and Quality Control in the
relative standard deviation), “percent” or “%” refers to mass fraction
(mass/mass) of the form g/100 g.
Chemical Analysis Laboratory
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 terms used in this test
standard.
method, refer to Terminology E135.
1.3 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 The sample is fused in a zirconium crucible with a
priate safety, health, and environmental practices and deter-
mixed flux of sodium carbonate and sodium peroxide. The
mine the applicability of regulatory limitations prior to use.
fused mass is dissolved in dilute HCl. The R O (Note 2)
2 3
1.4 This international standard was developed in accor-
hydroxides are precipitated with NH OH and redissolved in
4
dance with internationally recognized principles on standard-
HCl. Iron, titanium, and so forth, are removed with cupferron
ization established in the Decision on Principles for the
and chloroform. The aqueous phase is treated with HNO and
3
Development of International Standards, Guides and Recom-
HClO and evaporated to dryness. After dissolving in dilute
4
mendations issued by the World Trade Organization Technical
HCl, the solution is filtered, and the filtrate is treated with an
Barriers to Trade (TBT) Committee.
excess of ethylenediaminetetraacetic acid (EDTA). The excess
EDTA is titrated with a standard zinc solution using xylenol
2. Referenced Documents
orange indicator. Ammonium fluoride is added to release the
3
2.1 ASTM Standards: EDTA bound to aluminum. This EDTA is then titrated with
D1193 Specification for Reagent Water standard zinc solution, and the percent aluminum is calculated.
NOTE 2—R O hydroxides are rare earth sesquioxides such as La O ,
E29 Practice for Using Significant Digits in Test Data to
2 3 2 3
Y O,Ce O,Gd O , and Eu O .
2 3 2 3 2 3 2 3
Determine Conformance with Specifications
E50 Practices for Apparatus, Reagents, and Safety Consid-
5. Significance and Use
erations for Chemical Analysis of Metals, Ores, and
5.1 Thistestmethodfortheanalysisofironoreconcentrates
Related Materials
and agglomerates is primarily intended as a referee method to
test for compliance with compositional specifications. It is
assumed that all who use this test method will be trained
1
This test method is under the jurisdiction of ASTM Committee E01 on
analysts capable of performing common laboratory procedures
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal- skillfully and safely. It is expected that work will be performed
lurgical Materials.
in a properly equipped laboratory and that proper waste
Current edition approved July 1, 2020. Published July 2021. Originally approved
disposal procedures will be followed. Appropriate quality
in1980.Lastpreviouseditionapprovedin2011asE738–11,whichwaswithdrawn
control practices shall be followed, such as those described in
January 2020 and reinstated in July 2020. DOI: 10.1520/E0738-20.
2
Bhargava, O. P., “Complexometric Determination of Aluminum in Iron Ore,
Guide E882.
Sinter, Concentrates, and Agglomerates,” Talanta, Vol 26, 1979, pp. 146 to 148.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6. Interferences
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1 None of the elements normally found in iron or
...
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