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ISO 11426:2021

Jewellery and precious metals — Determination of gold — Cupellation method (fire assay) ISO 11426:2021

Publication date:   Mar 11, 2021

General information

60.60 Standard published   Mar 11, 2021

ISO

ISO/TC 174 Jewellery and precious metals

International Standard

39.060   Jewellery

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Scope

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 999,5 parts per thousand (‰) by weight. Fineness 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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 11426:2014

NOW

PUBLISHED
ISO 11426:2021
60.60 Standard published
Mar 11, 2021