GSO ISO 11426:2024

ISO 11426:2021
Gulf Standard   Current Edition · Approved on 25 April 2024

Jewellery and precious metals — Determination of gold — Cupellation method (fire assay)

GSO ISO 11426:2024 Files

English 8 Pages
Current Edition Reference Language
31.29 OMR

GSO ISO 11426:2024 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.

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