ISO 9658:1990

Name: ISO 9658:1990 — Steel — Determination of aluminium content — Flame atomic absorption spectrometric method
SKU: ISO 9658:1990
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Steel — Determination of aluminium content — Flame atomic absorption spectrometric method

Название (английский):

ISO 9658:1990

Steel — Determination of aluminium content — Flame atomic absorption spectrometric method

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 22 февраля 1990 г.
Издание:: ISO IS 9658 edition 1 version 1
ICS:: 77.080.20

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Описание (английский):

The method is applicable to the determination of acid-soluble and/or total aluminium content between 0,005 % (m/m) and 0,20 % (m/m). Specifies definition, principle, reagents, apparatus, sampling, procedure, expression of results and test report. The annexes give additional information on the international co-operative tests, a graphical representation of precision data and procedures for the determination of instrumental criteria.

Abstract

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Overview

ISO 9658:1990 specifies a flame atomic absorption spectrometric (FAAS) method for the determination of aluminium in steels, covering both acid-soluble and total aluminium in the range 0.005 % (m/m) to 0.20 % (m/m). The standard defines the principle, reagents, apparatus, sampling, detailed procedures, calculation and expression of results, reporting requirements and annexed instrumental and precision criteria based on international inter‑laboratory trials.

Key topics & technical requirements

Scope & range: Applicable for acid-soluble and/or total Al between 0.005–0.20 % (m/m). Alternative preparation steps and calibration tables are given for the 0.010–0.20 % range.

Sample preparation

Acid-soluble Al: add fusion mixture solution, cool, vent CO2, dilute to volume, discard insoluble residue (retain filtrate).
Total Al: char and ignite insoluble residue, treat with HF and H2SO4, fuse, dissolve fusion products in HCl and water, transfer to volumetric flask.

Calibration & matrix matching: Calibration solutions are prepared using an iron matrix and aluminium standard additions (tables supplied). A fresh calibration graph is required for each series of determinations.

Instrumental settings (FAAS)

Lamp: aluminium hollow-cathode; wavelength 309.3 nm.
Flame: dinitrogen monoxide–acetylene, non‑luminous oxidizing flame; red-feather height 10–20 mm.
Bandwidth: follow manufacturer; if unspecified, 0.2–0.7 nm suggested.
Background correction may be necessary if zero member shows measurable absorbance.

Performance & quality criteria

Procedures for limit of detection, characteristic concentration, minimum precision and graph linearity (e.g., AA/A1 ≥ 0.7) are detailed in Annex A.
Precision (repeatability and reproducibility) was evaluated by 28 laboratories; results and logarithmic relationships are reported (Annex C).

Safety & good practice: Warnings about acetylene hazards, UV protection, burner maintenance, water traps and frequent spraying of distilled water between solutions.

Applications & users

ISO 9658 is used for:

Quality control and composition verification in steel production.

Certification testing and compliance with material specifications.

Metallurgical laboratories, third‑party testing bodies, failure analysis and R&D where accurate aluminium quantification in steel is required.

Instrument manufacturers and laboratory managers establishing FAAS methods and performance checks.

Related standards

ISO 5725 (statistical methods for repeatability and reproducibility) is referenced for precision evaluation.

Applicable FAAS instrument manufacturer guidance should be followed for lamp current, bandwidth and background correction settings.

Keywords: ISO 9658, aluminium determination, steel, flame atomic absorption spectrometry, FAAS, acid‑soluble aluminium, total aluminium, calibration, precision, metallurgical testing.

ISO 9658:1990

Abstract

Похожие стандарты

Overview

Key topics & technical requirements

Applications & users

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