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ASTM E342-04

(Test Method)

Standard Test Method for Determination of Chromium Oxide in Chrome Ores by Permanganate Titrimetry

Standard Test Method for Determination of Chromium Oxide in Chrome Ores by Permanganate Titrimetry

SIGNIFICANCE AND USE
This test method is intended to be used for compliance with compositional specifications for chromium oxide content. It is assumed that all who use these procedures 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 must be followed such as those described in Guide E 882.
SCOPE
1.1 This test method covers the determination of chromium oxide (Cr2O3) in chrome ores in the concentration range from 25 to 60 %.
1.2 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.

General Information

Status
Historical
Publication Date
30-Apr-2004
ICS
73.060.30 - Chromium ores
Technical Committee
E01 - Analytical Chemistry for Metals, Ores, and Related Materials
Drafting Committee
E01.02 - Ores, Concentrates, and Related Metallurgical Materials
Current Stage
Ref Project

Relations

Replaces
ASTM E342-99 - Standard Test Method for Chromium Oxide in Chrome Ores
Effective Date
01-May-2004
Replaced By
ASTM E342-11 - Standard Test Method for Determination of Chromium Oxide in Chrome Ores by Permanganate Titrimetry
Effective Date
01-Dec-2011
Referred By
ASTM E1282-21 - Standard Guide for Specifying the Chemical Compositions and Selecting Sampling Practices and Quantitative Analysis Methods for Metals, Ores, and Related Materials
Effective Date
01-May-2004

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ASTM E342-04 - Standard Test Method for Determination of Chromium Oxide in Chrome Ores by Permanganate TitrimetryASTM E342-04 - Standard Test Method for Determination of Chromium Oxide in Chrome Ores by Permanganate Titrimetry
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ASTM E342-04 - Standard Test Method for Determination of Chromium Oxide in Chrome Ores by Permanganate Titrimetry
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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:E342–04
Standard Test Method for
Determination of Chromium Oxide in Chrome Ores by
1
Permanganate Titrimetry
This standard is issued under the fixed designation E342; 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 nitrate, potassium permanganate, and peroxydisulfate. The
excess of permanganate is destroyed by the addition of sodium
1.1 This test method covers the determination of chromium
chloride.Aftercooling,thechromateisreducedbytheaddition
oxide (Cr O ) in chrome ores in the concentration range from
2 3
of a measured excess of a ferrous ammonium sulfate, and the
25 to 60 %.
excess titrated with a standard permanganate solution.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 This test method is intended to be used for compliance
priate safety and health practices and determine the applica-
with compositional specifications for chromium oxide content.
bility of regulatory limitations prior to use.
It is assumed that all who use these procedures will be trained
2. Referenced Documents analysts capable of performing common laboratory procedures
2
skillfully and safely. It is expected that work will be performed
2.1 ASTM Standards:
in a properly equipped laboratory and that proper waste
D1193 Specification for Reagent Water
disposal procedures will be followed. Appropriate quality
E50 Practices for Apparatus, Reagents, and Safety Consid-
control practices must be followed such as those described in
erations for Chemical Analysis of Metals, Ores, and
Guide E882.
Related Materials
E135 Terminology Relating to Analytical Chemistry for
6. Interferences
Metals, Ores, and Related Materials
6.1 None of the elements normally found in chrome ores
E276 Test Method for Particle Size or Screen Analysis at
interfere with this test method.
No. 4 (4.75-mm) Sieve and Finer for Metal-Bearing Ores
and Related Materials
7. Reagents and Materials
E882 Guide for Accountability and Quality Control in the
7.1 Purity of Reagents—Reagent grade chemicals shall be
Chemical Analysis Laboratory
used in all tests. Unless otherwise indicated, it is intended that
3. Terminology all reagents conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society where
3.1 Definitions—For definitions of terms used in this test
3
such specifications are available . Other grades may be used,
method, refer to Terminology E135.
provided it is first ascertained that the reagent is of sufficiently
4. Summary of Test Method high purity to permit its use without lessening the accuracy of
the determination.
4.1 The sample is decomposed by fusion with sodium
7.2 Purity of Water—Unless otherwise indicated, references
peroxide. After leaching in water and boiling to decompose
to water shall be understood to mean reagent water as defined
peroxides, the solution is acidified with nitric and sulfuric
by Type I of Specification D1193.
acids. Residual chromium is oxidized to chromate with silver
7.3 Ammonium Peroxydisulfate Solution (250 g/L)—
Dissolve 25 g of ammonium persulfate (ammonium peroxy-
1
This test method is under the jurisdiction of ASTM Committee E01 on
disulfate) ((NH ) S O ) in water, and dilute to 100 mL.
4 2 2 8
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
Prepare fresh as needed.
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
lurgical Materials.
Current edition approved May 1, 2004. Published June 2004. Originally
3
approved in 1967. Last previous edition approved in 1999 as E342 – 99. DOI: Reagent Chemical, American Chemical Society Specifications, American
10.1520/E0342-04. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole Dorset, U. K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary,U.S.PharmaceuticalConvention,Inc.,(USPC),Rockville,
the ASTM website. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E342–04
7.4 Ferrous Ammonium Sulfate, Standard Solution (0.2 melted,
...

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5.1 This test method is intended to be used for compliance with compositional specifications for chromium oxide content in chromium-bearing ores. It is assumed that all who use these procedures 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 must be followed such as those described in Guide E882.
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