SIST EN ISO 11494:2019

Jewellery and precious metals - Determination of platinum in platinum alloys - ICP-OES method using an internal standard element (ISO 11494:2019)

This document describes an analytical procedure for the determination of platinum in platinum alloys with a nominal content up to 990 ‰ (parts per thousand), including alloys according to ISO 9202.

Schmuck und Edelmetalle - Bestimmung von Platin in Platinschmucklegierungen - ICP-OES-Verfahren unter Verwendung eines internen Standardelements (ISO 11494:2019)

Joaillerie et métals précieux - Dosage du platine dans les alliages de platine - Méthode par l'ICP-OES, utilisant un étalon interne (ISO 11494:2019)

Le présent document décrit un mode opératoire analytique pour le dosage du platine dans les alliages de platine, d'une teneur nominale allant jusqu'à 990 ? (millièmes), notamment pour les alliages conformes à l'ISO 9202.

Nakit in plemenite kovine - Določevanje platine v zlitinah platine - Metoda ICP-OES z uporabo notranjega standardnega elementa (ISO 11494:2019)

Ta dokument opisuje analitski postopek za določevanje platine v zlitinah platine z nominalno vsebnostjo do 990 ‰ (delov na tisoč), vključujoč zlitine v skladu s standardom ISO 9202.

General Information

• Status: Published
• Public Enquiry End Date: 24-Mar-2019
• Publication Date: 16-Sep-2019
• ICS: 39.060 - Jewellery
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Sep-2019
• Due Date: 11-Nov-2019
• Completion Date: 17-Sep-2019
• Ref Project: EN ISO 11494:2019 - Jewellery and precious metals - Determination of platinum in platinum alloys - ICP-OES method using an internal standard element (ISO 11494:2019)

Relations

• Replaces: SIST EN ISO 11494:2016 - Jewellery - Determination of platinum in platinum jewellery alloys - ICP-OES method using yttrium as internal standard element (ISO 11494:2014)
• Effective Date: 04-Sep-2019
• Revised: SIST EN ISO 11494:2016 - Jewellery - Determination of platinum in platinum jewellery alloys - ICP-OES method using yttrium as internal standard element (ISO 11494:2014)
• Effective Date: 04-Apr-2018

Overview

EN ISO 11494:2019 - "Jewellery and precious metals - Determination of platinum in platinum alloys - ICP‑OES method using an internal standard element" - specifies an analytical ICP‑OES procedure for measuring platinum content in platinum alloys with nominal platinum content up to 990 ‰ (parts per thousand). The method uses an internal standard (typically yttrium) and a bracketing calibration approach. It applies to jewellery and precious‑metal alloys, including those referenced in ISO 9202.

Key topics and technical requirements

• Principle: Dissolve accurately weighed samples in aqua regia, add an internal standard, and measure the ratio of platinum emission intensity to internal standard emission by ICP‑OES using bracketing calibration.
• Scope: Platinum alloys up to 990 ‰; minor method modifications described for alloys containing Ru, Rh, Ir or W.
• Reagents: Analytical grade HCl (30–37 %), HNO3 (65–70 %), high‑purity Pt (≥999.9 ‰), yttrium compound for internal standard, high‑purity copper (Pt‑free) and orthophosphoric acid for tungsten cases.
• Equipment: ICP‑OES capable of simultaneous measurement of Pt and the internal standard with minimum optical resolution 0.02 nm; analytical balance with 0.01 mg readability.
• Calibration & standards:
  • Bracketing uses two standards nearest expected sample concentration; recommended to prepare at least three for linearity checks.
  • Example standard masses listed (approx. 45–100 mg Pt) for preparing calibration solutions.
  • Internal standard solution: ~6 mg/L yttrium (typical preparation given).
• Sample preparation:
  • Typical sample mass: ~100 mg dissolved in aqua regia and adjusted to precise mass/volume.
  • Matrix matching and consistent acid concentration between calibration solutions and sample solutions are required.
  • Alloys with >5 % Ru/Ir/W may require pressure dissolution or preliminary alloying with Pt‑free copper; add orthophosphoric acid when tungsten is present.
• Measurement: Simultaneous measurement of Pt and internal standard emission lines, appropriate background correction, clean sample introduction system and stabilized plasma.
• Quality: Calculation method, repeatability, and test report content specified.

Applications and who uses this standard

• Quality control and assay testing in jewellery manufacturers, assay offices, precious‑metal refineries and laboratories.
• Compliance testing for hallmarking and certification of platinum jewellery and components.
• Analytical laboratories performing elemental analysis of platinum alloys for trade, customs, and materials verification.

Related standards

• ISO 9202 - reference for platinum alloy compositions.
• ISO 11596 - sampling of precious metal items (sampling procedure referenced).
• EN ISO 11494:2019 supersedes EN ISO 11494:2016.

Keywords: EN ISO 11494:2019, platinum determination, ICP‑OES, internal standard, yttrium, platinum alloys, jewellery testing, aqua regia dissolution, bracketing calibration.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2019
Nadomešča:
SIST EN ISO 11494:2016
Nakit in plemenite kovine - Določevanje platine v zlitinah platine - Metoda ICP-OES
z uporabo notranjega standardnega elementa (ISO 11494:2019)
Jewellery and precious metals - Determination of platinum in platinum alloys - ICP-OES
method using an internal standard element (ISO 11494:2019)
Schmuck und Edelmetalle - Bestimmung von Platin in Platinschmucklegierungen - ICP-
OES-Verfahren unter Verwendung eines internen Standardelements (ISO 11494:2019)
Joaillerie et métals précieux - Dosage du platine dans les alliages de platine - Méthode
par l'ICP-OES, utilisant un étalon interne (ISO 11494:2019)
Ta slovenski standard je istoveten z: EN ISO 11494:2019
ICS:
39.060 Nakit Jewellery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11494
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2019
EUROPÄISCHE NORM
ICS 39.060 Supersedes EN ISO 11494:2016
English Version
Jewellery and precious metals - Determination of platinum
in platinum alloys - ICP-OES method using an internal
standard element (ISO 11494:2019)
Joaillerie, bijouterie et métaux précieux - Dosage du Schmuck und Edelmetalle - Bestimmung von Platin in
platine dans les alliages de platine - Méthode par l'ICP- Platinschmucklegierungen - ICP-OES-Verfahren unter
OES, utilisant un étalon interne (ISO 11494:2019) Verwendung eines internen Standardelements (ISO
11494:2019)
This European Standard was approved by CEN on 26 April 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11494:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11494:2019) has been prepared by Technical Committee ISO/TC 174 "Jewellery
and precious metals" in collaboration with Technical Committee CEN/SS M21 “Precious metals -
Applications in jewellery and associated products” the secretariat of which is held by CCMC.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2020, and conflicting national standards
shall be withdrawn at the latest by February 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11494:2016.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 11494:2019 has been approved by CEN as EN ISO 11494:2019 without any modification.

INTERNATIONAL ISO
STANDARD 11494
Third edition
2019-07
Jewellery and precious metals —
Determination of platinum in
platinum alloys — ICP-OES method
using an internal standard element
Joaillerie et métaux précieux — Dosage du platine dans les alliages de
platine — Méthode par ICP-OES utilisant un étalon interne
Reference number
ISO 11494:2019(E)
©
ISO 2019
ISO 11494:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 11494:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Equipment . 2
7 Sampling . 2
8 Procedure. 2
8.1 Internal standard solution . 2
8.2 Calibration solutions . 2
8.3 Sample solutions . 2
8.4 Preparation of the platinum alloy solution containing ruthenium, iridium, or tungsten . 3
8.5 Measurements . 3
9 Calculation and expression of results . 3
9.1 Calculation . 3
9.2 Repeatability . 5
10 Test report . 5
Bibliography . 6
ISO 11494:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 174, Jewellery and precious metals.
This third edition cancels and replaces the second edition (ISO 11494:2014), which has been technically
revised.
The main changes compared to the previous edition are as follows:
a) the definition of bracketing in Clause 3 has been removed;
b) the recommended lines in Clause 4 have been removed;
c) reagents in Clause 5 have been changed and removed, and the requirements a
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