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EVS-EN ISO 11426:2021

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

Üldinfo
Kehtiv alates 01.04.2021
Alusdokumendid
ISO 11426:2021; EN ISO 11426:2021
Tegevusala (ICS grupid)
39.060 Juveelitooted
Direktiivid või määrused
puuduvad
Standardi ajalugu
Staatus
Kuupäev
Tüüp
Nimetus
01.04.2021
Põhitekst
01.11.2016
Põhitekst
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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