EN ISO 11210:2023

Jewellery and precious metals - Determination of platinum - Gravimetry using ammonium chloride (ISO 11210:2023)

This document specifies a gravimetric method for the determination of platinum on a material considered homogeneous. The platinum content of the sample lies preferably between 50 and 999 parts per thousand (‰) by mass. Fineness above 999 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).
This method is also intended to be used as one of the recommended methods for the determination of fineness in jewellery alloys covered by ISO 9202.

Schmuck und Edelmetalle - Bestimmung von Platin - Gravimetrie mittels Ammoniumchlorid (ISO 11210:2023)

Dieses Dokument legt ein gravimetrisches Verfahren zur Bestimmung von Platin für ein als homogen angesehenes
Material fest. Der Platingehalt der Probe liegt vorzugsweise zwischen 50 und 999 Massenteilen je Tausend
(‰). Der Feingehalt über 999 ‰ kann mit einer spektroskopischen Differenzverfahren bestimmt werden (z. B.
ISO 15093).
Dieses Verfahren ist als eines der empfohlenen Verfahren für die Bestimmung des Feingehalts von Schmucklegierungen
nach ISO 9202 vorgesehen.

Joaillerie, bijouterie et métaux précieux - Dosage du platine - Méthode gravimétrique utilisant le chlorure d’ammonium (ISO 11210:2023)

Le présent document spécifie une méthode gravimétrique de dosage du platine sur un matériau considéré homogène. La teneur en platine des échantillons est de préférence comprise entre 50 et 999 millièmes (‰) en masse. Les titres supérieurs à 999 ‰ peuvent être déterminés à l’aide d’une méthode de spectroscopie par différence (par exemple ISO 15093).
Cette méthode est également destinée à être utilisée comme l’une des méthodes recommandées pour la détermination du titre dans les alliages pour la bijouterie-joaillerie couverts par l’ISO 9202.

Nakit in plemenite kovine - Določevanje platine - Gravimetrija z amonijevim kloridom (ISO 11210:2023)

Ta dokument določa gravimetrično metodo za določevanje platine v zlitinah platine. Vsebnost platine v vzorcu bi morala biti med 50 in 999 delov na tisoč (‰) glede na težo. Finost nad 999 ‰ je mogoče določiti z metodo spektroskopije glede na razlike (npr. standard ISO 15093).
Metoda je namenjena tudi za uporabo kot priporočena metoda za določanje finosti v zlitinah za nakit, ki je zajeta v standardu ISO 9202.

General Information

• Status: Published
• Publication Date: 14-Mar-2023
• ICS: 39.060 - Jewellery
• Technical Committee: CEN/TC 410 - Project Committee - Consumer confidence and nomenclature in the diamond industry
• Drafting Committee: CEN/SS M21 - Precious metals - Applications in jewellery and associated products
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Mar-2023
• Completion Date: 15-Mar-2023
• Ref Project: SIST EN ISO 11210:2023 - Jewellery and precious metals - Determination of platinum - Gravimetry using ammonium chloride (ISO 11210:2023)

Relations

• Replaces: EN ISO 11210:2016 - Jewellery - Determination of platinum in platinum jewellery alloys - Gravimetric method after precipitation of diammonium hexachloroplatinate (ISO 11210:2014)
• Effective Date: 18-Jan-2023

Overview

EN ISO 11210:2023 - Jewellery and precious metals - Determination of platinum - Gravimetry using ammonium chloride specifies a gravimetric laboratory method for accurately determining platinum content in homogeneous precious‑metal materials. The method is suitable for finenesses preferably between 50 and 999 ‰ (parts per thousand) by mass. For fineness above 999 ‰ the standard points to spectroscopic methods by difference (e.g. ISO 15093). EN ISO 11210:2023 supersedes the 2016 edition and aligns the method with related standards for jewellery and precious‑metal testing.

Key topics and technical requirements

• Principle: dissolve sample in aqua regia, precipitate platinum as diammonium hexachloroplatinate using ammonium chloride, ignite to metallic platinum (“platinum sponge”) and weigh gravimetrically.
• Silver removal: where silver is present, separate as silver chloride (AgCl) before platinum precipitation.
• Co‑precipitated elements: re‑dissolve platinum sponge and check for alloying elements (e.g. by ICP‑OES) and apply corrections.
• Reagents and apparatus: specifies analytical‑grade reagents (HCl, HNO3, aqua regia, NH4Cl, saturated NH4Cl solution), muffle furnace (≥900 °C), reduction apparatus, porcelain crucibles, ashless filter paper (≈3 μm), and an analytical balance with 0.01 mg readability.
• Sampling and preparation: sampling according to ISO 11596; flattening samples, weighing representative portions (targeting ~250 mg–1 g Pt); controlled evaporation cycles without drying; temperature control to avoid Pt reduction and re‑oxidation steps if needed.
• Quality and reporting: calculation, repeatability provisions (Clause 9), and required test‑report contents are defined. Safety and handling guidance is included for corrosive reagents and reducing gases.

Applications and users

• Used by assay offices, jewellery manufacturers, precious‑metal refineries, testing laboratories, and regulatory authorities for determining platinum fineness and composition.
• Practical for quality control of jewellery alloys and other precious‑metal products, material certification, dispute resolution, and process control in refining.
• Suitable as one of the recommended methods for determining fineness in jewellery alloys covered by ISO 9202.

Related standards

• ISO 15093 - spectroscopy methods by difference for very high fineness.
• ISO 9202 - determination of fineness in jewellery alloys (recommended methods).
• ISO 11490 - harmonized procedures referenced in the revision.
• ISO 11596 - sampling of precious‑metal articles.

Keywords: EN ISO 11210:2023, platinum determination, gravimetry using ammonium chloride, jewellery testing, precious metals analysis, diammonium hexachloroplatinate, platinum sponge, aqua regia, ICP‑OES.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2023
Nakit in plemenite kovine - Določevanje platine - Gravimetrija z amonijevim
kloridom (ISO 11210:2023)
Jewellery and precious metals - Determination of platinum - Gravimetry using ammonium
chloride (ISO 11210:2023)
Schmuck und Edelmetalle - Bestimmung von Platin - Gravimetrie mittels
Ammoniumchlorid (ISO 11210:2023)
Joaillerie, bijouterie et métaux précieux - Dosage du platine - Méthode gravimétrique
utilisant le chlorure d’ammonium (ISO 11210:2023)
Ta slovenski standard je istoveten z: EN ISO 11210:2023
ICS:
39.060 Nakit Jewellery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11210
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2023
EUROPÄISCHE NORM
ICS 39.060 Supersedes EN ISO 11210:2016
English Version
Jewellery and precious metals - Determination of platinum
- Gravimetry using ammonium chloride (ISO 11210:2023)
Joaillerie, bijouterie et métaux précieux - Dosage du Schmuck und Edelmetalle - Bestimmung von Platin -
platine - Méthode gravimétrique utilisant le chlorure Gravimetrie mittels Ammoniumchlorid (ISO
d'ammonium (ISO 11210:2023) 11210:2023)
This European Standard was approved by CEN on 19 February 2023.

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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11210:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11210:2023) has been prepared by Technical Committee ISO/TC 174 "Jewellery
and precious metals" in collaboration with 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 September 2023, and conflicting national standards
shall be withdrawn at the latest by September 2023.
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 11210:2016.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 11210:2023 has been approved by CEN as EN ISO 11210:2023 without any modification.

INTERNATIONAL ISO
STANDARD 11210
Third edition
2023-02
Jewellery and precious metals —
Determination of platinum —
Gravimetry using ammonium chloride
Joaillerie, bijouterie et métaux précieux — Dosage du platine —
Méthode gravimétrique utilisant le chlorure d’ammonium
Reference number
ISO 11210:2023(E)
ISO 11210:2023(E)
© ISO 2023
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 11210:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Sampling . 2
8 Procedure .2
8.1 Preliminary analysis . 2
8.2 Preparation of samples free of silver . 2
8.3 Preparation of samples containing silver . 3
8.4 Precipitation of platinum with ammonium chloride . 3
9 Calculation and expression of results . 4
9.1 Calculation . 4
9.2 Repeatability . 5
10 Test report . 5
Annex A (informative) Reduction apparatus example . 6
Bibliography . 7
iii
ISO 11210:2023(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
committee has been established has the right to be represented on that committee. International
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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
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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 the European Committee for Standardization (CEN) Technical
Committee CEN/SSM21, Precious metals — Applications in jewellery and associated products, in
collaboration with ISO Technical Committee TC 174, Jewellery and precious metals, in accordance with
the agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 11210:2014), which has been technically
revised.
The main changes are as follows:
— extension of the scope of application to all precious metal alloys beyond the jewellery sector;
— clarification of the fineness for which the test is suitable;
— addition of a specific preparation for samples containing a significant amount of silver in Clause 8;
— addition of an alternative method for the filtration in Clause 8;
— harmonization of method with ISO 11490.
Any feedback or questions on this document should be directed to the user’s national standards body. A
compl
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