BS EN ISO 11426:2021
Current
The latest, up-to-date edition.
Jewellery and precious metals. Determination of gold. Cupellation method (fire assay)
Hardcopy , PDF
English
29-03-2021
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
STI/53
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| DocumentType |
Standard
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| Pages |
16
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| PublisherName |
British Standards Institution
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| Status |
Current
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| Supersedes |
This document specifies a cupellation method (fire assay) for the determination of gold on a material considered homogeneous. The gold content of the sample lies preferably between 100 and 999,5parts per thousand (‰) by weight. Fineness above 999,5‰ can be determined using a spectroscopy method by difference (e.g. ISO15093).The procedure is applicable to most types of gold samples. Some modifications are indicated for specific cases (presence of large amount of base metals, platinum or palladium, silver). It is not compatible with the presence above trace levels of iridium, rhodium and ruthenium (more than 0,25‰ for the sum of all three elements).This method is also intended to be used as the recommended method for the determination of fineness in jewellery alloys covered by ISO9202.
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