ISO 11426:2021 珠宝和贵金属 金的测定 杯形测定法（火试金法）

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

本文件规定了一种杯法（火试金法），用于测定被认为是均匀的材料上的金。样品的金含量优选在100至999.5重量份/千(‰)之间。高于999.5‰的细度可以使用光谱法通过差异测定（例如ISO 15093）。该程序适用于大多数类型的金样品。对于特定情况（存在大量贱金属、铂或钯、银），指示了一些修改。它与痕量铱、铑和钌的存在不相容（超过0,25？所有三种元素的总和）。该方法也旨在用作测定ISO 9202涵盖的珠宝合金细度的推荐方法。

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.

标准预览图