ASTM E1568-03

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Designation:E1568–03
Standard Test Method for
Determination of
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Gold in Activated Carbon by Fire Assay Gravimetry
This standard is issued under the fixed designation E 1568; 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.
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1. Scope E 300 Practice for Sampling Industrial Chemicals
E 882 Guide for Accountability and Quality Control in the
1.1 This test method covers the determination of gold in
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Chemical Analysis Laboratory
activated carbon by fire assay collection and gravimetric
E 1601 Practice for Conducting an Interlaboratory Studies
measurement. It covers the range of 15 to 5000 µg/g gold.
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of Methods for Chemical Analysis of Metals
1.2 The values stated in SI units are to be regarded as the
2.2
standard. The values given in parentheses are for information
E 173 Practice for Conducting Interlaboratory Studies of
only.
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Methods for Chemical Analysis of Metals
1.3 This standard does not purport to address all of the
safety problems, if any, associated with its use. It is the
3. Terminology
responsibility of the user of this standard to establish appro-
3.1 Definitions:
priate safety and health practices and determine the applica-
For definitions of terms used in this test method, refer to
bility of regulatory limitations prior to use.Forspecifichazards
Terminology E 135.
statements, see Section 9 and Notes 2-4, Note 6, and Note 7.
4. Summary of Test Method
2. Referenced Documents
4.1 The weighed test sample is ignited and fused with fire
2.1 ASTM Standards:
assay flux in a clay crucible. The lead metal from the fusion is
D 2862 Test Method for Particle Size Distribution of
2 separated and the precious metals concentrated by oxidation
Granular Activated Carbon
and adsorption of the lead on a cupel, the silver is parted with
D 2866 Test Method for Total Ash Content of Activated
2 nitric acid, and the gold is annealed and weighed on a
Carbon
2 microbalance.
D 2867 Test Method for Moisture in Activated Carbon
E 29 Practice for Using Significant Digits in Test Data to
5. Significance and Use
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Determine Conformance with Specifications
5.1 In the primary metallurgical processes used by the
E 50 Practices for Apparatus, Reagents, and Safety Precau-
4 mineral processing industry for gold bearing ores, gold is
tions for Chemical Analysis of Metals
extracted with alkaline cyanide solutions and adsorbed onto
E 135 Terminology Relating to Analytical Chemistry for
4 activated carbon for recovery of the metal. Metallurgical
Metals, Ores, and Related Materials
accounting, process control, and ore evaluation procedures for
E 173 Practice for Conducting Interlaboratory Studies of
5 this type of mineral processing plant depend on accurate,
Methods for Chemical Analysis of Metals
precise, and prompt measurements of gold concentrations in
E 276 Test Method for Particle Size or Screen Analysis at
the activated carbon.
No. 4 (4.75 mm) Sieve and Finer for Metal-Bearing Ores
4 5.2 This test method for gold in activated carbon is intended
and Related Materials
primarily as a referee method to test such materials for metal
content. It is assumed that those who use these procedures will
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This test method is under the jurisdiction of ASTM Committee E01 on
be trained analysts capable of performing common laboratory
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
proceduresskillfullyandsafely.Itisexpectedthatworkwillbe
responsibility of Subcommittee E01.02 on Ores, Concentrates, and Related Metal-
performed in a properly equipped laboratory and that proper
lurgical Materials.
Current edition approved June 10, 2003. Published August 2003. Originally
published in 1993. Last previous edition approved in 1998 as E 1568–93 (1998).
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Annual Book of ASTM Standards, Vol 15.01. Annual Book of ASTM Standards, Vol 15.05.
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Annual Book of ASTM Standards, Vol 14.02. Annual Book of ASTM Standards, Vol 03.06.
4 8
Annual Book of ASTM Standards, Vol 03.05. Global Engineering Documents, 15 Inverness Way East, Englewood, Colorado
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Discontinued; see Annual Book of ASTM Standards, Vol 03.05. 80112.
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E1568–03
waste disposal procedures will be followed. Appropriate qual- 8.10 Strong Nitric Acid Parting Solution, HNO (1 + 2)—
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ity control practices must be followed, such as those described Add 330 mL nitric acid to 660 mL of H O.
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in Guide E 882.
8.11 Weak NitricAcid Parting Solution,HNO (1 + 4)—Add
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200 mL nitric acid to 800 mL H O.
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6. Int
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