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)

Status : Current, Draft for public comment   Published : September 2020

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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.




Standard Number20/30404745 DC
TitleBS EN ISO 11426. Jewellery and precious metals. Determination of gold. Cupellation method (fire assay)
StatusCurrent, Draft for public comment
Publication Date03 September 2020
Normative References(Required to achieve compliance to this standard)ISO 15093
Informative References(Provided for Information)ISO 11596, ISO 9202
International RelationshipsISO/DIS 11426
Draft Expiry Date18 October 2020
DescriptorsGold alloys, Quantitative analysis, Determination of content, Chemical analysis and testing, Jewellery, Reproducibility, Gold, Control samples, Specimen preparation, Extraction methods of analysis, Combustion test methods, Non-ferrous alloys, Assay
ICS39.060
Title in FrenchTitre manque
CommitteeSTI/53
PublisherBSI
FormatA4
DeliveryYes
Pages15
File Size294 KB
NotesWarning: this draft is not current beyond its expiry date for comments.
Price£20.00


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