Проект комитета
ISO/CD 25643
Jewellery and precious metals — Determination of silver — Cupellation method (fire assay)
Ссылочный номер
ISO/CD 25643
Версия 1
Проект комитета
ISO/CD 25643
90991
Проект данного международного стандарта рассматривается комитетом.

Тезис

This document specifies a cupellation method (fire assay) for the determination of silver on a material considered homogeneous. The silver content of the sample lies preferably between 400 parts per thousand (‰) to 999 parts per thousand (‰) by mass. Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15096 or ISO 18214). The procedure is applicable to most types of silver samples. Some modifications are indicated for specific cases (presence of a large amount of base metals, see Annex A). It is compatible with the presence above trace levels of Platinum Group Metals, see Annex B. This method is also intended to be used as the recommended method for the determination of fineness in jewellery alloys covered by ISO 9202.

Общая информация

  •  : В стадии разработки
    : Регистрация проекта комитета (CD) [30.00]
  •  : 1
  • ISO/TC 174
  • RSS обновления

Жизненный цикл

Появились вопросы?

Ознакомьтесь с FAQ