ASTM E1335-04e1
(Test Method)Standard Test Methods for Determination of Gold in Bullion by Cupellation
Standard Test Methods for Determination of Gold in Bullion by Cupellation
SCOPE
1.1 These test methods cover cupellation analysis of bullion having chemical compositions within the following limits:ElementConcentration Range, %Gold 0.5 to 4.0 and 20.0 to 99.0Silver 1.0 to 99.5Total gold plus silver75.0 to 100.0
1.2 These test methods appear in the following order: Sections20.0-99.0 % gold0.5-4.0 % gold98.9-99.8 % gold
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 and health practices and determine the applicability of regulatory limitations prior to use. For specific safety hazards, see Section 8.
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Designation:E1335–04
Standard Test Methods for
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Determination of Gold in Bullion by Cupellation
This standard is issued under the fixed designation E 1335; 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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e NOTE—Editorial changes were made throughout the text in February 2006.
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1. Scope Methods for Chemical Analysis of Metals
E 882 Guide for Accountability and Quality Control in the
1.1 These test methods cover cupellation analysis of bullion
Chemical Analysis Laboratory
having chemical compositions within the following limits:
E 1601 Practice for Conducting an Interlaboratory Study to
Element Concentration Range, %
Evaluate the Performance of an Analytical Method
Gold 0.5 to 4.0 and 20.0 to 99.0
E 1763 Guide for Interpretation and Use of Results from
Silver 1.0 to 99.5
Interlaboratory Testing of Chemical Analysis Methods
Total gold plus silver 75.0 to 100.0
1.2 These test methods appear in the following order: 3. Terminology
Sections
3.1 Definitions:
3.1.1 annealing—a thermal treatment to change the proper-
20.0–99.0% gold 10-16
0.5–4.0% gold 17-21 ties or grain structure of the product.
98.9–99.8% gold 22-28
3.1.2 cupel—a small, shallow, porous cup, usually made of
bone ash or magnesite.
1.3 This standard does not purport to address all of the
3.1.3 cupellation—an oxidizing fusion of lead, sample base
safety concerns, if any, associated with its use. It is the
metals and gold, and silver in a cupel. The lead is oxidized to
responsibility of the user of this standard to establish appro-
litharge (PbO); other base metals which may be present, such
priate safety and health practices and determine the applica-
ascopperandtin,areoxidizedaswell.Theoxidizedmetalsare
bility of regulatory limitations prior to use. For specific safety
absorbed into the cupel, leaving a gold and silver doré bead on
hazards, see Section 8.
the cupel surface.
2. Referenced Documents
3.1.4 doré bead—a gold and silver alloy bead which results
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from cupellation.
2.1 ASTM Standards:
3.1.5 inquartation—the addition of silver to an assay
B 562 Specification for Refined Gold
sample to facilitate parting.
E 29 Practice for Using Significant Digits in Test Data to
3.1.6 parting—separating silver from gold by selectively
Determine Conformance with Specifications
dissolving the silver in acid, usually nitric acid.
E50 Practices forApparatus, Reagents, and Safety Consid-
3.1.7 proof—a synthetic standard having a composition
erations for Chemical Analysis of Metals, Ores, and
similar to the test sample.
Related Materials
3.1.8 proof correction—analyzing the proof concurrently
E 135 Terminology Relating to Analytical Chemistry for
with the test sample and using the results to correct the final
Metals, Ores, and Related Materials
assay.
E 173 Practice for Conducting Interlaboratory Studies of
3.1.9 For definitions of other terms, refer to Terminology
E 135.
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These test methods are under the jurisdiction of ASTM Committee E01 on 4. Significance and Use
Analytical Chemistry for Metals, Ores and Related Materials and are the direct
4.1 Thesetestmethodsareintendedforthedeterminationof
responsibility of Subcommittee E01.03 on Precious Metals.
thegoldcontentofgoldandsilverbullion.Itisassumedthatall
Current edition approved Oct. 1, 2004. Published November 2004. Originally
approved in 1990. Last previous edition approved in 2003 as E 1335 – 03.
who use these test methods are trained assayers capable of
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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
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the ASTM website. Withdrawn.
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E1335–04
performing common fire assay procedures skillfully and safely. 9.2 Prepare shot samples from molten metal poured into
It is expected that work will be performed in a properly water. Use only whole single pieces between 1 and 3 mm in
equipped laboratory. diameter.
9.3 Pin tube samples are prepared from molten metal drawn
5. Interferences
intovacuum-evacuatedglasstubes.Breaktheglassandinspect
5.1 If the bullion contains any of the following elements in
the samples to ensure that they are not hollow and that they are
excess of the concentrations shown, the accuracy and precision
free from slag and inclusions.
requirements of these test methods may not be achieved.
9.3.1 Roll the samples lengthwise on a clean rolling
...
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