EN ISO 9658:2024

SLOVENSKI STANDARD
oSIST prEN ISO 9658:2023
01-december-2023
Jeklo - Določevanje aluminija - Metoda plamenske atomske absorpcijske
spektrometrije (ISO/DIS 9658:2023)
Steel - Determination of aluminium content - Flame atomic absorption spectrometric
method (ISO/DIS 9658:2023)
Stahl - Bestimmung des Aluminiumgehaltes -
Flammenatomextinktionsspektrometrisches Verfahren (ISO/DIS 9658:2023)
Aciers - Détermination de l'aluminium - Méthode par spectrométrie d'absorption
atomique dans la flamme (ISO/DIS 9658:2023)
Ta slovenski standard je istoveten z: prEN ISO 9658
ICS:
77.040.30 Kemijska analiza kovin Chemical analysis of metals
77.080.20 Jekla Steels
77.120.10 Aluminij in aluminijeve zlitine Aluminium and aluminium
alloys
oSIST prEN ISO 9658:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 9658:2023
oSIST prEN ISO 9658:2023
DRAFT INTERNATIONAL STANDARD
ISO/DIS 9658
ISO/TC 17/SC 1 Secretariat: JISC
Voting begins on: Voting terminates on:
2023-10-23 2024-01-15
Steel — Determination of aluminium content — Flame
atomic absorption spectrometric method
Aciers — Dosage de l'aluminium — Méthode par spectrométrie d'absorption atomique dans la flamme
ICS: 77.080.20
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ISO/DIS 9658:2023(E)
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oSIST prEN ISO 9658:2023
ISO/DIS 9658:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 9658
ISO/TC 17/SC 1 Secretariat: JISC
Voting begins on: Voting terminates on:

Steel — Determination of aluminium content — Flame
atomic absorption spectrometric method
Aciers — Dosage de l'aluminium — Méthode par spectrométrie d'absorption atomique dans la flamme
ICS: 77.080.20
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2023
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 9658:2023(E)
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023

oSIST prEN ISO 9658:2023
ISO/DIS 9658:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 3
7 Sampling and preparation of the test samples . 4
8 Procedure .4
8.1 Test portion . 4
8.2 Blank test . 4
8.3 Determination . 4
8.3.1 Preparation of the test solution . 4
8.3.2 Preparation of the calibration solutions . 5
8.3.3 Adjustment of atomic absorption spectrometer . 6
8.3.4 Optimizing the atomic absorption spectrometer settings . 6
8.3.5 Spectrometric measurements . 7
8.4 Plotting the calibration graph . 7
9 Expression of results . 8
9.1 Method of calculation . 8
9.2 Precision . . . 8
10 Test report . 9
Annex A (informative) Procedures for the determination of instrumental criteria .10
Annex B (informative) Additional information on the international cooperative test .12
Annex C (informative) Graphical representation of precision data .13
Annex D (informative) Determination of acid-soluble aluminium .14
Bibliography .16
iii
oSIST prEN ISO 9658:2023
ISO/DIS 9658:2023(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
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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
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on the ISO list of patent declarations received (see www.iso.org/patents).
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 1, Methods of
determination of chemical composition.
This second edition cancels and replaces the first edition (ISO 9658:1990), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— re-assessment of the precision data;
— updating of the normative references;
— adding of some notes that could contribute to a better accuracy of the method;
— Editorially updated;
— Bibliography added.
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.
iv
oSIST prEN ISO 9658:2023
DRAFT INTERNATIONAL STANDARD ISO/DIS 9658:2023(E)
Steel — Determination of aluminium content — Flame
atomic absorption spectrometric method
1 Scope
This document specifies a flame atomic absorption spectrometric method for the determination of
aluminium in non-alloyed steel.
The method is applicable to aluminium contents between 0,005 % (mass fraction) and 0,20 % (mass
fraction).
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 385, Laboratory glassware — Burettes
ISO 648, Laboratory glassware — Single-volume pipettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological 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/
3.1
acid-soluble aluminium
aluminium dissolved in the acid mixture.
4 Principle
Dissolution of a test portion in dilute hydrochloric and nitric acids.
Fusion of the acid-insoluble residues with a mixture of orthoboric acid and potassium carbonate.
Nebulization of the solution into a dinitrogen monoxide- acetylene flame.
Spectrometric measurement of the atomic absorption of the 309,3 nm spectral line emitted by an
aluminium hollow cathode lamp.
NOTE Other suitable radiation sources can also be used, provided the criteria in 6.5.1 to 6.5.4 are still met.
oSIST prEN ISO 9658:2023
ISO/DIS 9658:2023(E)
5 Reagents
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only
distilled water or water of equivalent purity as specified in ISO 3696.
5.1 Pure iron, containing less than 0,000 1 % (mass fraction) of aluminium or of low and known
aluminium content.
5.2 Hydrofluoric acid, ρ approximately 1,15 g/ml.
5.3 Hydrochloric acid, ρ approximately 1,19 g/ml, diluted 1 + 1.
5.4 Hydrochloric acid, ρ approximately 1,19 g/ml, diluted 2 + 100.
5.5 Sulfuric acid, ρ approximately 1,84 g/ml, diluted 1 + 1.
5.6 Hydrochloric-nitric acids mixture.
Mix three volumes of hydrochloric acid (ρ approximately 1,19 g/ml), one volume of nitric acid
...