ASTM E508-03

Standard Test Method for Calcium and Magnesium in Iron Ores by Atomic Absorption Spectrometry

SIGNIFICANCE AND USE
This test method is intended as a referee method for compliance with compositional specifications for impurity content. It is assumed that all who use this procedure will be trained analysts capable of performing common laboratory practices 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. Follow appropriate quality control practices such as those described in Guide E 882.
SCOPE
1.1 This test method covers the determination of calcium and magnesium in iron ores, concentrates, and agglomerates in the concentration range from 0.05 to 5 % of calcium and 0.05 to 3 % of magnesium.
1.2 This standard does not purport to address all of the safety problems, 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.

General Information

• Status: Historical
• Publication Date: 09-Jun-2003
• ICS: 71.040.50 - Physicochemical methods of analysis
• 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

Relations

• Replaces: ASTM E508-98 - Standard Test Method for Calcium and Magnesium in Iron Ores by Atomic Absorption Spectrometry
• Effective Date: 10-Jun-2003
• Replaced By: ASTM E508-08 - Standard Test Method for Analysis of Calcium and Magnesium in Iron Ores by Flame Atomic Absorption Spectrometry
• Effective Date: 15-Dec-2008
• Referred By: ASTM F2529-13(2021) - Standard Guide for <emph type="ital"> in vivo</emph> Evaluation of Osteoinductive Potential for Materials Containing Demineralized Bone (DBM)
• Effective Date: 10-Jun-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E508–03
Standard Test Method for
Calcium and Magnesium in Iron Ores by Atomic Absorption
1
Spectrometry
This standard is issued under the fixed designation E 508; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method covers the determination of calcium 3.1 Definitions—For definitions of terms used in this test
and magnesium in iron ores, concentrates, and agglomerates in method, refer to Terminology E 135.
the concentration range from 0.05 to 5 % of calcium and 0.05
4. Summary of Test Method
to 3 % of magnesium.
1.2 This standard does not purport to address all of the 4.1 The sample is dissolved in hydrochloric acid with the
addition of a small amount of nitric acid.After evaporation and
safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- dehydration, any insoluble residue is filtered, treated for the
recovery of calcium and magnesium, and added to the main
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. solution. The solution is aspirated into the flame of the atomic
absorption spectrometer. For calcium, a nitrous oxide-
2. Referenced Documents
acetylene burner is used, for magnesium, an air-acetylene
2
2.1 ASTM Standards: burner is preferred (Note 1). The absorbed energy at the
D 1193 Specification for Reagent Water resonance line of the spectrum of calcium or magnesium, or
E50 Practices for Apparatus, Reagents, and Safety Precau- both, is measured by atomic absorption spectrophotometry and
tions for Chemical Analysis of Metals compared with that of the calibration solutions of the two
E 135 Terminology Relating to Analytical Chemistry for elements.
Metals, Ores and Related Materials
NOTE 1—If a nitrous oxide burner is used for the determination of
E 276 Test Method for Particle Size or Screen Analysis at
magnesium, the sensitivity is decreased by a factor of about three.
No. 4 (4.75-mm) Sieve and Finer for Metal-Bearing Ores
If an air-acetylene burner is used for the determination of calcium,
and Related Materials several elements, if present in percent amounts, interfere with the calcium
determination. Also, lanthanum chloride must be employed and the
E 882 Guide for Accountability and Quality Control in the
sensitivity is decreased by a factor of about two.
Chemical Analysis Laboratory
2.2 Other Documents
5. Significance and Use
E 663-86 (1991) Practice for Flame Atomic Absorption
3 5.1 This test method is intended as a referee method for
Analysis
compliance with compositional specifications for impurity
content. It is assumed that all who use this procedure will be
trained analysts capable of performing common laboratory
1
This test method is under the jurisdiction of ASTM Committee E-1 on
practices skillfully and safely. It is expected that work will be
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
performed in a properly equipped laboratory and that proper
lurgical Materials.
wastedisposalprocedureswillbefollowed.Followappropriate
Current edition approved June 10, 2003. Published August 2003. Originally
quality control practices such as those described in Guide
approved in 1973. Last previous edition approved in 1998 as E 508 – 98.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or E 882.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
6. Interferences
the ASTM website.
3
6.1 None of the elements normally found in iron ores
Available from Global Engineering Documents, 15 Inverness Way, East
Englewood, CO 80112-5704 interfere with this test method (Note 1).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E508–03
7. Apparatus the dropwise addition of nitric acid (HNO , sp gr 1.42).
3
Evaporate to a syrupy consistency. Add 20 mL of HCl (sp gr
7.1 Atomic Absorption Spectrophotometer, meeting the fol-
1.19) and dilute to 200 mL with water. Add 20 g of sodium
lowing criteria:
chloride (NaCl) dissolved in 200 mL water and dilute to 1 L
7.1.1 Minimum Sensitivity—The absorbance of the highest
with water.
calibration solution (see 8.4) must be at least 0.3.
8.6 Lanthanum Chloride Solution (50 g/L)—Dissolve 50 g
7.1.2 Curve-Linearity—The difference between the rea
...