ASTM E278-01
(Test Method)Standard Test Method for the Determiniation of Phosphorus in Iron Ores by Phosphomolybdate Coprecipitation and Nitric Acid Titrimetry
Standard Test Method for the Determiniation of Phosphorus in Iron Ores by Phosphomolybdate Coprecipitation and Nitric Acid Titrimetry
SCOPE
1.1 This test method covers the determination of phosphorus in iron ores, concentrates, and agglomerates.
1.2 This test method covers the determination of phosphorus in the concentration range from 0.01 to 1.00%.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:E278–01
Standard Test Method for the Determination of
Phosphorus in Iron Ores by Phosphomolybdate
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Coprecipitation and Nitric Acid Titrimetry
This standard is issued under the fixed designation E 278; 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 to strong fumes to dehydrate the silica.The insoluble residue is
filtered off, ignited, and treated for the recovery of any
1.1 This test method covers the determination of phospho-
contained phosphorus. Ammonium molybdate is added to
rus in iron ores, concentrates, and agglomerates.
precipitate phosphomolybdate. The precipitate is filtered off
1.2 This test method covers the determination of phospho-
and washed free from acid. It is then dissolved in an excess of
rus in the concentration range from 0.01 to 1.00 %.
standard sodium hydroxide solution. The excess sodium hy-
1.3 This standard does not purport to address all of the
droxide is titrated with a standard solution of nitric acid using
safety concerns, if any, associated with its use. It is the
phenolphthalein as an indicator.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 This test method is intended to be used for compliance
2. Referenced Documents with compositional specifications for phosphorus content. It is
assumed that all who use these procedures will be trained
2.1 ASTM Standards:
2
analysts capable of performing common laboratory procedures
D 1193 Specification for Reagent Water
skillfully and safely. It is expected that work will be performed
E 50 Practices forApparatus, Reagents, and Safety Consid-
in a properly equipped laboratory and that proper waste
erations for Chemical Analysis of Metals, Ores, and
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disposal procedures will be followed. Appropriate quality
Related Materials
control practices shall be followed, such as those described in
E 135 Terminology Relating to Analytical Chemistry for
3
Guide E 882.
Metals, Ores, and Related Materials
E 691 Practice for Conducting an Interlaboratory Study to
6. Interferences
4
Determine the Precision of a Test Method
6.1 Vanadium and arsenic, elements commonly found in
E 877 PracticeforSamplingandSamplePreparationofIron
5 iron ores, coprecipitate with the phosphorus. Provisions for
Ores and Related Materials
their removal or elimination of their interference are included
E 882 Guide for Accountability and Quality Control in the
5 in this test method.
Chemical Analysis Laboratory
6.2 Titanium tends to form an insoluble compound with
3. Terminology phosphorus and thus may cause low values for phosphorus.
Provision for its removal is included in this test method.
3.1 Definitions—For definitions of terms used in this test
method, refer to Terminology E 135.
7. Reagents and Materials
4. Summary of Test Method 7.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
4.1 The sample is dissolved in hydrochloric and nitric acids.
all reagents conform to the specifications of the Committee on
After the addition of perchloric acid, the solution is evaporated
Analytical Reagents of the American Chemical Society where
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such specifications are available. Other grades may be used,
provided it is first ascertained that the reagent is of sufficient
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This test method is under the jurisdiction of ASTM Committee E01 on
high purity to permit its use without lessening the accuracy of
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
the determination.
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
lurgical Materials.
Current edition approved November 10, 2001. Published November 2001.
e1
Originally published as E 278 – 65 T. Last previous edition E 278 – 96 .
2 6
Annual Book of ASTM Standards, Vol 11.01. “Reagent Chemicals, American Chemical Society Specifications,” Am. Chem.
3
Annual Book of ASTM Standards, Vol 03.05. Soc., Washington, DC. For suggestions on the testing of reagents not listed by the
4
Annual Book of ASTM Standards, Vol 14.02. American Chemical Society, see “Reagent Chemicals and Standards,” by Joseph
5
Annual Book of ASTM Standards, Vol 03.06. Rosin,D.NostrandCo.,Inc.,NewYork,NY,andthe“UnitedStatesPharmacopeia.”
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E278
7.2 Purity of Water—Unless otherwise indicated, references the p
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