ISO 19919:2025 PDF

Name: ISO 19919:2025 — Jewellery and precious metals — Determination of silver — ICP-OES method using an internal standard element
SKU: ISO 19919:2025
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Jewellery and precious metals — Determination of silver — ICP-OES method using an internal standard element

Название (английский):

ISO 19919:2025

Jewellery and precious metals — Determination of silver — ICP-OES method using an internal standard element

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 25 ноября 2025 г.
Издание:: ISO IS 19919 edition 1 version 1
ICS:: 39.060

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Описание (английский):

This document specifies an analytical method for the determination of silver on a material considered homogeneous. The silver content of the samples lies preferably between 50 ‰ (parts per thousand) and 990 ‰ (parts per thousand). Fineness above 990,0 ‰ can be determined using a spectroscopy method by difference (see ISO 15096). NOTE Lower contents of silver can be analysed according to this method.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 19919:2025 - Jewellery and precious metals - Determination of silver - ICP-OES method using an internal standard element specifies an analytical procedure for accurate measurement of silver content in homogeneous precious-metal materials. The method is optimized for silver fineness from 50 ‰ to 990 ‰ (parts per thousand); higher fineness (>990 ‰) is addressed by spectroscopy-by-difference methods (see ISO 15096). The technique uses inductively coupled plasma optical emission spectrometry (ICP‑OES) with an internal standard to correct for instrument drift and matrix effects.

Key topics and technical requirements

Scope and sample range: Preferable silver content 50 ‰–990 ‰; lower contents can also be analysed.

Sample preparation: Weigh at least two accurately known test portions (example ~100 mg), dissolve in nitric acid, precipitate with concentrated hydrochloric acid, re‑dissolve and make up to measurement volume.

Internal standards: Use single‑element standards such as yttrium, scandium, indium, germanium or lutetium; typical stock concentrations suggested (e.g., ~300 mg·L⁻¹ for In/Lu/Ge, ~100 mg·L⁻¹ for Sc/Y) and added in a fixed mass to all solutions.

Calibration and bracketing: Bracketing calibration uses two calibration solutions that bracket the sample concentration (recommended preliminary check with three calibration standards). Measurement sequence example: low standard – sample – high standard – sample – low standard – …

Instrumentation and performance: ICP‑OES capable of simultaneous measurement of Ag and internal standard with minimum optical resolution 0.02 nm. Use high‑purity argon (≥99.995 %), grade‑A volumetric flasks and an analytical balance with 0.01 mg readability.

Quality criteria: Recommended linearity check (regression coefficient >0.9999) and final relative standard deviation (RSD) ≤ 0.3 % after calculation. Choose emission lines free from spectral interference (recommended wavelengths listed in the standard).

Applications and who uses it

ISO 19919:2025 is intended for:

Assay offices and analytical laboratories performing silver determination in jewellery, bullion and precious‑metal alloys

Jewellery manufacturers and quality control teams verifying fineness and material conformity

Precious metals refineries and traders requiring traceable, reproducible results for certification and trade

Benefits include improved accuracy through internal standardization, robust matrix correction, and traceable calibration suitable for regulatory and commercial reporting.

Related standards

ISO 15096 - spectroscopy method by difference for very high fineness (>990 ‰)

ISO 11596 - sampling of precious metals and alloys (referenced for sampling procedures)

Keywords: ISO 19919:2025, ICP‑OES, silver determination, jewellery and precious metals, internal standard, fineness, calibration, analytical method.

ISO 19919:2025 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO 15096:2008

Jewellery — Determination of silver in 999 0/00 silver jewellery alloys — Difference method using inductively…

SIST EN ISO 11596:2026

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