ISO 18719:2025
(Main)Fine ceramics (advanced ceramics, advanced technical ceramics) — Methods for chemical analysis of impurities in yttrium oxide powders using inductively coupled plasma-optical emission spectrometry
Fine ceramics (advanced ceramics, advanced technical ceramics) — Methods for chemical analysis of impurities in yttrium oxide powders using inductively coupled plasma-optical emission spectrometry
This document specifies methods for chemical analysis of impurities in refined high-purity yttrium oxide (Y2O3) powders used as a raw material for fine ceramics. This document is applicable for determination of aluminium (Al), calcium (Ca), cobalt (Co), iron (Fe) and silicon (Si) in yttrium oxide powders. Yttrium oxide powders are decomposed by microwave decomposition method. The aluminium (Al), calcium (Ca), cobalt (Co), iron (Fe) and silicon (Si) contents are determined by using inductively coupled plasma-optical emission spectrometry (ICP-OES). This document does not apply to coarse unrefined powders from mineral extraction and processing operations, which are covered by ISO 24181-1.
Céramiques techniques (céramiques avancées, céramiques techniques avancées) — Méthodes d'analyse chimique des impuretés contenues dans les poudres d'oxyde d'yttrium à l'aide de la spectrométrie d'émission optique par plasma à couplage inductif
General Information
Standards Content (Sample)
International
Standard
ISO 18719
First edition
Fine ceramics (advanced ceramics,
2025-10
advanced technical ceramics) —
Methods for chemical analysis of
impurities in yttrium oxide powders
using inductively coupled plasma-
optical emission spectrometry
Céramiques techniques (céramiques avancées, céramiques
techniques avancées) — Méthodes d'analyse chimique des
impuretés contenues dans les poudres d'oxyde d'yttrium à l'aide
de la spectrométrie d'émission optique par plasma à couplage
inductif
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Analytes and ranges . 2
6 Preparation of test sample . 2
6.1 General .2
6.2 Sampling .2
6.3 Drying .2
6.4 Weighing .2
7 Reporting the analytical values . . 2
7.1 Number of analyses .2
7.2 Blank test .2
7.3 Evaluation of analytical values .2
8 Decomposition of test sample . 3
8.1 General .3
8.2 Reagents .3
8.3 Apparatus and instruments.3
8.4 Equipment cleaning .4
8.5 Sample decomposition .4
8.6 Blank test .4
9 Determination of impurity elements . 4
9.1 Reagents .4
9.2 Apparatus and instruments.5
9.3 Measurement .5
9.4 Calibration .5
9.4.1 Drawing of the calibration curve .5
9.5 Calculation .6
10 Test report . 6
Annex A (informative) Analytical results obtained from an inter-laboratory test . 7
Bibliography . 9
iii
Foreword
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iv
International Standard ISO 18719:2025(en)
Fine ceramics (advanced ceramics, advanced technical
ceramics) — Methods for chemical analysis of impurities in
yttrium oxide powders using inductively coupled plasma-
optical emission spectrometry
WARNING — Suitable health and safety procedures should be followed. Persons using this document
should be familiar with normal laboratory practice. This document does not purport to address all
of the safety problems, if any, associated with its use. It is the responsibility of the user to establish
appropriate safety and health practices and to determine applicability of any national regulatory
conditions.
1 Scope
This document specifies methods for chemical analysis of impurities in refined high-purity yttrium oxide
(Y O ) powders used as a raw material for fine ceramics.
2 3
This document is applicable for determination of aluminium (Al), calcium (Ca), cobalt (Co), iron (Fe) and
silicon (Si) in yttrium oxide powders. Yttrium oxide powders are decomposed by microwave decomposition
method. The aluminium (Al), calcium (Ca), cobalt (Co), iron (Fe) and silicon (Si) contents are determined by
using inductively coupled plasma-optical emission spectrometry (ICP-OES).
This document does not apply to coarse unrefined powders from mineral extraction and processing
operations, which are covered by ISO 24181-1.
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 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
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
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 Principle
The samples are digested by hydrochloric acid (1+1) or nitric acid (1+1) in closed vessels using a microwave
digestion system, and the test solution is diluted with water. In order to determine the contents of impurities
in yttrium oxide with an ICP-OES, the effect of the main component, i.e. yttrium, is corrected with a blank
standard solution and mixed standard solutions at the optimum wavelength of each element. Create a
calibration curve and measure each component to determine the concentration. The contents of impurities
in the sample are calculated by comparing the emission intensities to the calibration curve.
5 Analytes and ranges
a) Aluminium (Al), range of 1,0 mg/kg to 100 mg/kg.
b) Calcium (Ca), range of 1,0 mg/kg to 100 mg/kg.
c) Cobalt (Co), range of 1,0 mg/kg to 100 mg/kg.
d) Iron (Fe), range of 1,0 mg/kg to 100 mg/kg.
e) Silicon (Si), range of 1,0 mg/kg to 100 mg/kg.
6 Preparation of test sample
6.1 General
Prepare the sample in accordance with ISO 8656-1, unless the actual method used is documented in the
test report.
6.2 Sampling
Take the sample in accordance with ISO 8656-1.
6.3 Drying
Place 10 g of the sample into a flat-type weighing bottle (60 mm × 30 mm) and spread it uniformly at the
bottom of the bottle. Place the bottle in a drying oven at 110 °C ± 5 °C for 2 h or more. Then, cover the mouth
of the bottle, and cool in a desiccator for 1 h.
6.4 Weighing
Weigh 0,5 g of the sample to the nearest 0,1 mg of the required quantity using a balance.
7 Reporting the analytical values
7.1 Number of analyses
Prepare each sample twice and analyse them at intervals of time.
7.2
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