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Homepage>BS Standards>39 PRECISION MECHANICS. JEWELLERY>39.060 Jewellery>20/30404745 DC BS EN ISO 11426. Jewellery and precious metals. Determination of gold. Cupellation method (fire assay)
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20/30404745 DC BS EN ISO 11426. Jewellery and precious metals. Determination of gold. Cupellation method (fire assay)

20/30404745 DC

BS EN ISO 11426. Jewellery and precious metals. Determination of gold. Cupellation method (fire assay)

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LANGUAGE
English
Standard number:20/30404745 DC
Pages:15
Released:2020-09-03
Status:Draft for Comment
DESCRIPTION
This standard 20/30404745 DC BS EN ISO 11426. Jewellery and precious metals. Determination of gold. Cupellation method (fire assay) is classified in these ICS categories:
  • 39.060 Jewellery

This document specifies a cupellation method (fire assay) for the determination of gold on a material considered homogeneous. The gold content of the sample should preferably lie between 100 and 999,5 parts per thousand (‰). Finenesses above 999,5 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).

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 ISO 9202.


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