ASTM E1070-17a

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Designation: E1070 − 17 E1070 − 17a
Standard Test Method for
Determination of Phosphorus in Iron Ores by Phospho-
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Molybdenum-Blue Spectrophotometry
This standard is issued under the fixed designation E1070; 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 This test method covers the determination of phosphorus in iron ores, concentrates, and agglomerates in the range from
0.005 % to 1.0 % phosphorus.
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 test method has been evaluated in accordance with Practice E1601 and Guide E1763. Unless otherwise noted in the
precision and bias section, the lower limit in the scope of each method specifies the lowest analyte content that may be analyzed
with acceptable error (defined as a nominal 5 % risk of obtaining a 50 % or larger relative difference in results on the same test
sample in two laboratories).
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 and health practices and determine the applicability of regulatory
limitations prior to use.
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
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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
E60 Practice for Analysis of Metals, Ores, and Related Materials by Spectrophotometry
E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
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
E1601 Practice for Conducting an Interlaboratory Study to Evaluate the Performance of an Analytical Method
E1763 Guide for Interpretation and Use of Results from Interlaboratory Testing of Chemical Analysis Methods (Withdrawn
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2015)
3. Terminology
3.1 Definitions—For definitions of terms used in this test method, refer to Terminology E135.
4. Summary of Test Method
4.1 The sample is fused in a zirconium crucible with sodium peroxide (Na O ). The melt is dissolved in water and HCl. In a
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suitable aliquot, the molybdenum blue complex is formed by the addition of ammonium molybdate-hydrazine sulfate solution. The
absorbance of the phospho-molybdenum-blue complex is measured at 725 nm.
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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 E01.02 on Ores, Concentrates, and Related Metallurgical Materials.
Current edition approved May 1, 2017Nov. 15, 2017. Published July 2017December 2017. Originally approved in 1985. Last previous edition approved in 20112017 as
E1070 – 11.17. DOI: 10.1520/E1070-17.10.1520/E1070-17A.
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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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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The last approved version of this historical standard is referenced on www.astm.org.
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E1070 − 17a
5. 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 users of this test method will be trained analysts capable of
performing common laboratory procedures skillfully and safely
...