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ASTM E945-07

(Test Method)

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

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

SIGNIFICANCE AND USE
This test method is primarily intended to test materials for compliance with compositional specifications. It is assumed that all who use this test method will be trained analysts working in properly equipped laboratories.
Appropriate quality control practices shall be followed such as those described in Guide E 882.
SCOPE
1.1 This test method covers the determination of zinc in ores, concentrates, and related materials having chemical composition within the following limits:
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-Jun-2007
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 E945-02a - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Tritrimetry
Effective Date
01-Jul-2007

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ASTM E945-07 - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric TitrimetryASTM E945-07 - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Titrimetry
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ASTM E945-07 - Standard Test Method for Determination of Zinc in Zinc Ores and Concentrates by Complexometric Titrimetry
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:E945–07
Standard Test Method for
Determination of Zinc in Zinc Ores and Concentrates by
1
Complexometric Titrimetry
This standard is issued under the fixed designation E945; 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 E135 Terminology Relating to Analytical Chemistry for
Metals, Ores, and Related Materials
1.1 This test method covers the determination of zinc in
E173 Practice for Conducting Interlaboratory Studies of
ores, concentrates, and related materials having chemical
3
Methods for Chemical Analysis of Metals
composition within the following limits:
3
E663 Practice for Flame Atomic Absorption Analysis
Element Concentration Range, %
E882 Guide for Accountability and Quality Control in the
Zinc 5.0 to 70.0
Chemical Analysis Laboratory
Lead 0.5 to 50.0
E1024 Guide for Chemical Analysis of Metals and Metal
Copper 0.1 to 3.0
Bearing Ores by Flame Atomic Absorption Spectropho-
Iron 0.5 to 16.0
3
Sulfur 4.0 to 30.0
tometry
Calcium 0.1 to 20.0
E1601 Practice for Conducting an Interlaboratory Study to
Magnesium 0.1 to 10.0
Evaluate the Performance of an Analytical Method
Cadmium 0.1 to 8.0
Arsenic 0.01 to 1.0
Antimony 0.01 to 0.005
3. Terminology
Bismuth 0.001 to 0.1
3.1 Definitions—For definitions of terms used in this test
Cobalt 0.1 to 0.5
Nickel 0.3 to 3.0
method, refer to Terminology E135.
Silver 0.00 to 150 oz/ton
Gold 0.00 to 1.0 oz/ton
4. Summary of Test Method
1.2 This standard does not purport to address all of the
4.1 The sample, after appropriate acid decomposition, is
safety concerns, if any, associated with its use. It is the
evaporated to near dryness. The salts are dissolved in acid,
responsibility of the user of this standard to establish appro-
interfering elements are removed, and the zinc is extracted as
priate safety and health practices and determine the applica-
thiocyanate complex into MIBK. Zinc is determined in the
bility of regulatory limitations prior to use.
extract by titrating with EDTA, using an internal indicator.
2. Referenced Documents
5. Significance and Use
2
2.1 ASTM Standards:
5.1 This test method is primarily intended to test materials
D1193 Specification for Reagent Water
forcompliancewithcompositionalspecifications.Itisassumed
E29 Practice for Using Significant Digits in Test Data to
that all who use this test method will be trained analysts
Determine Conformance with Specifications
working in properly equipped laboratories.
E50 Practices for Apparatus, Reagents, and Safety Consid-
5.2 Appropriate quality control practices shall be followed
erations for Chemical Analysis of Metals, Ores, and
such as those described in Guide E882.
Related Materials
6. Interferences
6.1 With the exception of cadmium and cobalt, elements do
1
This test method is under the jurisdiction of ASTM Committee E01 on
not interfere if their concentrations are under the maximum
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
limits shown in 1.1.
lurgical Materials.
6.2 When the cadmium content is above 5.0 % in the
Current edition approved July 15, 2007. Published July 2007. Originally
material to be analyzed, some of the cadmium is extracted and
approved in 1983. Last previous edition approved in 2002 as E945 – 02a. DOI:
will titrate as zinc. The addition of potassium iodide before the
10.1520/E0945-07.
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
3
Standards volume information, refer to the standard’s Document Summary page on Withdrawn. The last approved version of this historical standard is referenced
the ASTM website. on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
E945–07
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 S
...

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