标准编号：ISO 11426:2021
中文名称：珠宝和贵金属 金的测定 杯形测定法（火试金法）
英文名称：Jewellery and precious metals — Determination of gold — Cupellation method (fire assay)
发布日期：2021-03
标准范围
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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