ISO 11426:2021

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

Standard Details

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.

General Information

Status : Published

Standard Type: Main

Document No: ISO 11426:2021

Document Year: 2021

Pages: 8

Edition: 4

Section Volume:
ISO/TC 174. Jewellery

ICS:
39.060 Jewellery

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