ASTM E463-21
(Test Method)Standard Test Method for Determination of Silica in Fluorspar by Silico-Molybdate Visible Spectrophotometry
Standard Test Method for Determination of Silica in Fluorspar by Silico-Molybdate Visible Spectrophotometry
SIGNIFICANCE AND USE
5.1 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 E882.
SCOPE
1.1 This test method covers the determination of silica in fluorspar from 0.5 % to 10 % by mass.
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
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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: E463 − 21
Standard Test Method for
Determination of Silica in Fluorspar by Silico-Molybdate
1
Visible Spectrophotometry
This standard is issued under the fixed designation E463; 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 E882 Guide for Accountability and Quality Control in the
Chemical Analysis Laboratory
1.1 This test method covers the determination of silica in
fluorspar from 0.5 % to 10 % by mass.
3. Terminology
1.2 The values stated in SI units are to be regarded as
3.1 Definitions—For definitions of terms used in this test
standard. No other units of measurement are included in this
method, refer to Terminology E135.
standard.
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
4.1 The sample is fused with anhydrous sodium borate and
responsibility of the user of this standard to establish appro-
the melt is dissolved in dilute HCl. Silica is determined
priate safety, health, and environmental practices and deter-
spectrophotometrically after extraction of the silico-molybdate
mine the applicability of regulatory limitations prior to use.
complex with butyl alcohol. Spectrophotometric measurement
1.4 This international standard was developed in accor-
of the extract is made at 400 nm.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Significance and Use
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 5.1 This test method is intended as a referee method for
Barriers to Trade (TBT) Committee. compliance with compositional specifications for impurity
content. It is assumed that all who use this procedure will be
2. Referenced Documents
trained analysts capable of performing common laboratory
2
practices skillfully and safely. It is expected that work will be
2.1 ASTM Standards:
performed in a properly equipped laboratory and that proper
D1193 Specification for Reagent Water
wastedisposalprocedureswillbefollowed.Followappropriate
E29 Practice for Using Significant Digits in Test Data to
quality control practices such as those described in Guide
Determine Conformance with Specifications
E882.
E50 Practices for Apparatus, Reagents, and Safety Consid-
erations for Chemical Analysis of Metals, Ores, and
6. Interferences
Related Materials
E135 Terminology Relating to Analytical Chemistry for
6.1 The elements ordinarily present in commercial fluor-
Metals, Ores, and Related Materials
spars do not interfere in this test method.
E276 TestMethodforParticleSizeorScreenAnalysisatNo.
4 (4.75-mm) Sieve and Finer for Metal-Bearing Ores and
7. Reagents and Materials
Related Materials
7.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
all reagents conform to the specifications of the Committee on
1
This test method is under the jurisdiction of ASTM Committee E01 on
Analytical Reagents of the American Chemical Society where
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
3
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal- such specifications are available. Other grades may be used,
lurgical Materials.
Current edition approved Oct. 1, 2021. Published October 2021. Originally
approved in 1972. Last previous edition approved in 2014 as E463 – 14a. DOI:
3
10.1520/E0463-21. Reagent Chemicals, American Chemical Society Specifications, American
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Chemical Society, Washington, DC, www.chemistry.org. For suggestions on the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM testing of reagents not listed by the American Chemical Society, see the United
Standards volume information, refer to the standard’s Document Summary page on States Pharmacopeia and National Formulary, U.S. Pharmacopeial Convention,
the ASTM website. Inc. (USPC), Rockville, MD, www.usp.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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E463 − 21
provided it is first ascertained that the reagent is of sufficiently flux settles on the crucible cover. Hold the crucible while
high purity to permit its use wi
...
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: E463 − 14a E463 − 21
Standard Test Method for
Determination of Silica in Fluorspar by Silico-Molybdate
1
Visible Spectrophotometry
This standard is issued under the fixed designation E463; 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 silica in fluorspar in concentrations from 0.5 % to 10 %.10 % by mass.
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 safety, health, and healthenvironmental 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.
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
E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
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
E882 Guide for Accountability and Quality Control in the Chemical Analysis Laboratory
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 with anhydrous sodium borate and the melt is dissolved in dilute HCl. Silica is determined
1
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 Oct. 1, 2014Oct. 1, 2021. Published November 2014October 2021. Originally approved in 1972. Last previous edition approved in 2014 as
E463 – 14.E463 – 14a. DOI: 10.1520/E0463-14A.10.1520/E0463-21.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E463 − 21
photometricallyspectrophotometrically after extraction of the silico-molybdate complex with normal butyl alcohol. Photometric-
Spectrophotometric measurement of the extract is made at 400 nm.
5. Significance and Use
5.1 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 E882.
6. Interferences
6.1 The elements ordinarily present in commercial fluorspars do not interfere in this test method.
7. Reagents and Materials
7.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where such
3
specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity
to permit its use without lessening the accuracy of the determination.
7.2 Unless otherwise indicated, references to water shall be understood to mean reagent water
...
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