oSIST prEN ISO 23739:2026

SLOVENSKI STANDARD
01-marec-2026
Fina keramika (sodobna keramika, sodobna tehnična keramika) - Preskusne
metode za kemične analize praškov cirkonijevega oksida (ISO/DIS 23739:2026)
Fine ceramics (advanced ceramics, advanced technical ceramics) - Methods for
chemical analysis of zirconium oxide powders (ISO/DIS 23739:2026)
Hochleistungskeramik - Verfahren zur chemischen Analyse von Zirconiumoxidpulvern
(ISO/DIS 23739:2026)
Céramiques techniques - Méthodes pour l'analyse chimique des poudres d'oxyde de
zirconium (ISO/DIS 23739:2026)
Ta slovenski standard je istoveten z: prEN ISO 23739
ICS:
81.060.30 Sodobna keramika Advanced ceramics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 23739
ISO/TC 206
Fine ceramics (advanced ceramics,
Secretariat: JISC
advanced technical ceramics) —
Voting begins on:
Methods for chemical analysis of
2026-01-12
zirconium oxide powders
Voting terminates on:
2026-04-06
Céramiques techniques — Méthodes pour l'analyse chimique des
poudres d'oxyde de zirconium
ICS: 81.060.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 23739:2026(en)
DRAFT
ISO/DIS 23739:2026(en)
International
Standard
ISO/DIS 23739
ISO/TC 206
Fine ceramics (advanced ceramics,
Secretariat: JISC
advanced technical ceramics) —
Voting begins on:
Methods for chemical analysis of
zirconium oxide powders
Voting terminates on:
Céramiques techniques — Méthodes pour l'analyse chimique des
poudres d'oxyde de zirconium
ICS: 81.060.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 23739:2026(en)
ii
ISO/DIS 23739:2026(en)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Analytes and ranges . 1
5 Preparation of the test sample. 2
5.1 General .2
5.2 Sampling .2
5.3 Drying .2
5.4 Weighing .2
6 Reporting the analytical values . . 2
6.1 Number of analyses .2
6.2 Blank test .2
6.3 Evaluation of the analytical values .2
6.4 Expression of analytical values .3
7 Decomposition of the test sample . 3
7.1 Classification of the sample decomposition methods.3
7.2 Acid pressure decomposition .3
7.2.1 Reagents .3
7.2.2 Apparatus and instruments .3
7.2.3 Procedure .4
7.2.4 Preparation of blank test .4
7.3 Alkali fusion .5
7.3.1 Reagents .5
7.3.2 Apparatus and instruments .5
7.3.3 Procedure .5
7.3.4 Preparation of blank test .5
8 Determination of the zirconium content . 6
8.1 Precipitation and gravimetric method .6
8.1.1 Principle .6
8.1.2 Reagents .6
8.1.3 Apparatus and instruments .6
8.1.4 Procedure .6
8.1.5 Blank test .6
8.1.6 Calculation .7
8.2 ICP–OES method.7
8.2.1 Principle .7
8.2.2 Reagents .7
8.2.3 Apparatus and instruments .7
8.2.4 Procedure .8
8.2.5 Blank test .8
8.2.6 Drawing of calibration curve .8
8.2.7 Calculation .8
9 Determination of the content of the major elements . 9
9.1 Precipitation and gravimetric method (for yttrium) .9
9.1.1 Principle .9
9.1.2 Reagents .9
9.1.3 Apparatus and instruments .9
9.1.4 Procedure .9
9.1.5 Blank test .9
9.1.6 Calculation .10
9.2 ICP–OES method (for calcium, hafnium, magnesium and yttrium) .10

iii
ISO/DIS 23739:2026(en)
9.2.1 Principle .10
9.2.2 Reagents .10
9.2.3 Apparatus and instruments .10
9.2.4 Procedure .11
9.2.5 Blank test .11
9.2.6 Drawing of calibration curve .11
9.2.7 Calculation . 12
10 Determination of the trace elements contents .12
10.1 Principle . 12
10.2 Reagents . 12
10.2.1 Elemental standard solution . 13
10.2.2 Mixed standard solution (each element 50 mg/l) . 13
10.3 Apparatus and instruments. 13
10.4 Procedure . 13
10.5 Blank test .14
10.6 Drawing of the calibration curve .14
10.7 Calculation . 15
11 Test report .15
Annex A (informative) Analytical results obtained from the interlaboratory test .16

iv
ISO/DIS 23739:2026(en)
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 organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 206, Fine Ceramics.
This second edition cancels and replaces the first edition (ISO 23739:2021), which has been technically
revised.
The main changes are as follows:
— Correction of calculation formulas
— Clarification of the barium determination method
— Addition of fundamental information regarding ICP-OES
— Revision of reagent descriptions
— Correction of minor technical errors and formatting updates
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
DRAFT International Standard ISO/DIS 23739:2026(en)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Methods for chemical analysis of zirconium
oxide powders
1 Scope
This document specifies methods for the chemical analysis of zirconium oxide powders used as the raw
material for fine ceramics.
It stipulates the determination methods of the zirconium, aluminium, barium, calcium, cerium, cobalt,
gadolinium, hafnium, iron, magnesium, potassium, silicon, sodium, strontium, titanium and yttrium contents
in zirconium oxide powders for fine ceramics. The test sample is decomposed by acid pressure decomposition
or alkali fusion. Contents of zirconium and yttrium are determined by using either a precipitation and
gravimetric method or an inductively coupled plasma–optical emission spectrometry (ICP–OES) method.
Contents of aluminium, barium, calcium, cerium, cobalt, gadolinium, hafnium, iron, magnesium, potassium,
silicon, sodium, strontium and titanium are determined by using an ICP–OES method.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 835, Laboratory glassware — Graduated pipettes
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 8656-1, Refractory products — Sampling of raw materials and unshaped products — Part 1: Sampling scheme
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Analytes and ranges
— Zirconium (Zr), range of 60 % to 74 % (mass fraction).
— Aluminium (Al), range of 0,01 % to 0,5 % (mass fraction).
— Barium (Ba), range of 0,01 % to 0,5 % (mass fraction).
— Calcium (Ca), range of 0,01 % to 6 % (mass fraction).
— Cerium (Ce), range of 0,01 % to 0,5 % (mass fraction).
— Cobalt (Co), range of 0,01 % to 0,5 % (mass fraction).

ISO/DIS 23739:2026(en)
— Gadolinium (Gd), range of 0,01 % to 0,5 % (mass fraction).
— Hafnium (Hf), range of 0,01 % to 2 % (mass fraction).
— Iron (Fe), range of 0,01 % to 0,5 % (mass fraction).
— Magnesium (Mg), range of 0,01 % to 6 % (mass fraction).
— Potassium (K), range of 0,01 % to 0,5 % (mass fraction).
— Sodium (Na), range of 0,01 % to 0,5 % (mass fraction).
— Silicon (Si), range of 0,01 % to 0,5 % (mass fraction).
— Strontium (Sr), range of 0,01 % to 0,5 % (mass fraction).
— Titanium (Ti), range of 0,01 % to 0,5 % (mass fraction).
— Yttrium (Y), range of 0,01 % to 15 % (mass fraction).
5 Preparation of the test sample
5.1 General
The sample preparation method shall be in accordance with ISO 8656-1, unless otherwise mutually agreed
upon by the analyser and customer.
5.2 Sampling
The sample shall be collected in accordance with ISO 8656-1
5.3 Drying
Place 10 g of the sample into a flat-type weighing bottle (60 mm × 30 mm) and spread it uniformly over
the bottom of the bottle. Place the bottle in an air bath at 110 °C ± 5 °C for 2 h, uncovered, and cool in a
desiccator, covered, for 1 h.
5.4 Weighing
Weigh the test sample to the nearest 0,1 mg of the required quantity using a balance.
6 Reporting the analytical values
6.1 Number of analyses
Prepare and analyse the test samples in duplicate.
6.2 Blank test
Prepare a blank solution by repeating the whole procedure omitting only the test sample. Upon analysis,
perform a blank test to correct the measured values.
6.3 Evaluation of the analytical values
When the difference between the two analytical values does not exceed the tolerance value (Table 1),
the average value shall be reported. When the difference between the two analytical values exceeds the
tolerance value, perform two additional analyses. When the difference of these further two analyses does

ISO/DIS 23739:2026(en)
not exceed the tolerance value, the average value thereof shall be reported. If the difference also exceeds the
tolerance value, the median of four analytical values shall be reported.
Table 1 — Tolerances for the analytical values
Units: % (mass fraction)
Parameter Zr Ca, Hf, Mg, Y Al, Ba, Ce, Co, Gd, Fe, K, Na, Si, Sr, Ti
a
0,01
Tolerance 0,70 0,01
b
0,1
a
Applicable to content of less than 0,1 %.
b
Applicable to content of not less than 0,1 %.
6.4 Expression of analytical values
The analytical values shall be given in % (mass fraction) on a dry basis. The results shall be expressed to
two decimal places (see Annex A).
7 Decomposition of the test sample
7.1 Classification of the sample decomposition methods
a) Acid pressure decomposition.
b) Alkali fusion.
7.2 Acid pressure decomposition
7.2.1 Reagents
It shall be ascertained that the reagents are of sufficiently high purity to permit their use without
compromising the accuracy of the determination.
7.2.1.1 Water, grade 1 according to ISO 3696, or superior.
7.2.1.2 Sulfuric acid, H SO , c(H SO ) = 96 % (mass fraction).
2 4 2 4
7.2.1.3 Sulfuric acid (1+1), H SO (7.2.1.2), diluted (1+1) by volume with water (7.2.1.1).
2 4
7.2.2 Apparatus and instruments
Ordinary laboratory apparatus and instruments shall be used together with the following:
7.2.2.1 Pressure decomposition vessel. A pressure decomposition vessel is shown in Figure 1. The
vessel shall be used exclusively for this analysis to avoid cross-contamination.
7.2.2.2 Polytetrafluoroethylene (PTFE) bottle, with cap.
7.2.2.3 Air bath, capable of heating at 230 °C ± 5 °C.

ISO/DIS 23739:2026(en)
Key
1 centre screw
2 screw cap
3 top plate
4 PTFE cap
5 cylinder
6 PTFE bottle
7 bottom plate
Figure 1 — Example of a pressure
...