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ASTM E945-02a

(Test Method)

Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Tritrimetry

Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Tritrimetry

SCOPE
1.1 This test method covers the determination of zinc in ores, concentrates, and related materials having chemical composition within the following limits: Element Concentration Range, %Zinc 5.0 to 70.0Lead 0.5 to 50.0Copper 0.1 to 3.0Iron 0.5 to 16.0Sulfur 4.0 to 30.0Calcium 0.1 to 20.0Magnesium0.1 to 10.0Cadmium 0.1 to 8.0Arsenic 0.01 to 1.0Antimony0.01 to 0.005Bismuth 0.001 to 0.1Cobalt 0.1 to 0.5Nickel 0.3 to 3.0Silver 0.00 to 150 oz/tonGold 0.00 to 1.0 oz/ton
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
09-Jun-2002
ICS
73.060.99 - Other metalliferous minerals
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 E945-02 - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Tritrimetry
Effective Date
10-Jun-2002
Replaced By
ASTM E945-07 - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Titrimetry
Effective Date
01-Jul-2007

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ASTM E945-02a - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric TritrimetryASTM E945-02a - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Tritrimetry
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ASTM E945-02a - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Tritrimetry
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:E945–02a
Standard Test Method for
Determination of Zinc in Zinc Ores and Concentrates by
1
Complexometric Titrimetry
This standard is issued under the fixed designation E 945; 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 E 173 Practice for Conducting Interlaboratory Studies of
5
Methods for Chemical Analysis of Metals
1.1 This test method covers the determination of zinc in
6
E 663 Practice for Flame Atomic Absorption Analysis
ores, concentrates, and related materials having chemical
E 882 Guide for Accountability and Quality Control in the
composition within the following limits:
7
Chemical Analysis Laboratory
Element Concentration Range, %
E 1024 Guide for Chemical Analysis of Metals and Metal
Zinc 5.0 to 70.0
Bearing Ores by Flame Atomic Absorption Spectropho-
Lead 0.5 to 50.0
7
tometry
Copper 0.1 to 3.0
E 1601 Practice for Conducting an Interlaboratory Study to
Iron 0.5 to 16.0
4
Sulfur 4.0 to 30.0
Evaluate the Performance of an Analytical Method
Calcium 0.1 to 20.0
Magnesium 0.1 to 10.0
3. Terminology
Cadmium 0.1 to 8.0
Arsenic 0.01 to 1.0
3.1 Definitions—For definitions of terms used in this test
Antimony 0.01 to 0.005
method, refer to Terminology E 135.
Bismuth 0.001 to 0.1
Cobalt 0.1 to 0.5
4. Summary of Test Method
Nickel 0.3 to 3.0
Silver 0.00 to 150 oz/ton
4.1 The sample, after appropriate acid decomposition, is
Gold 0.00 to 1.0 oz/ton
evaporated to near dryness. The salts are dissolved in acid,
1.2 This standard does not purport to address all of the
interfering elements are removed, and the zinc is extracted as
safety concerns, if any, associated with its use. It is the
thiocyanate complex into MIBK. Zinc is determined in the
responsibility of the user of this standard to establish appro-
extract by titrating with EDTA, using an internal indicator.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5. Significance and Use
5.1 This test method is primarily intended to test materials
2. Referenced Documents
forcompliancewithcompositionalspecifications.Itisassumed
2.1 ASTM Standards:
that all who use this test method will be trained analysts
2
D 1193 Specification for Reagent Water
working in properly equipped laboratories.
E 29 Practice for Using Significant Digits in Test Data to
5.2 Appropriate quality control practices shall be followed
3
Determine Conformance with Specifications
such as those described in Guide E 882.
E 50 Practices for Apparatus, Reagents, and Safety Precau-
4
6. Interferences
tions for Chemical Analysis of Metals
E 135 Terminology Relating to Analytical Chemistry for
6.1 With the exception of cadmium and cobalt, elements do
4
Metals, Ores and Related Materials
not interfere if their concentrations are under the maximum
limits shown in 1.1.
6.2 When the cadmium content is above 5.0 % in the
1
This test method is under the jurisdiction of ASTM Committee E01 on
material to be analyzed, some of the cadmium is extracted and
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
will titrate as zinc. The addition of potassium iodide before the
responsibility of Subcommittee E01.02 on Ores, Concentrates, Refractories, Ce-
ment, and Related Metallurgical Materials.
Current edition approved June 10, 2002. Published June 2002. Originally
5
published as E 945 – 83. Last previous edition E 945 – 02. Discontinued 1997;Available from Global Engineering, 15 Iverness Way East,
2
Annual Book of ASTM Standards, Vol 11.01. Englewood, Colorado 80112.
3 6
Annual Book of ASTM Standards, Vol 14.02. Discontinued; see 1997 Annual Book of ASTM Standards, Vol 03.06.
4 7
Annual Book of ASTM Standards, Vol 03.05. Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E945–02a
titration serves to prevent the interference of cadmium. The
Amount of
EDTA · 2H O EDTA Standard Zinc
2
amount of potassium iodide solution to add in order to prevent
If the expected Weight, g/L Concentration Solution to
the interference of cadmium is listed in 13.10.3.
zinc is: Use
6.3 Cobalt is extracted and titrated with the zinc. If the 5 to 20 % 6.642 6 g/L 10 mL
20 to 40 % 13.29 12 g/L 30 mL
cobalt content of the material to be analyzed is less than
40 to 56 % 17.71 16 g/L 40 mL
0.05 %, the interference is negligible. For cobalt contents
56 to 70 % 22.14 20 g/L 50 mL
greater than 0.05 %, the cobalt must be extracted as outlined in
8.8.2 Standardize the EDTA
...

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