ISO/DTS 4188

Magnesium and magnesium alloys - Determination of arsenic - Inductively coupled plasma optical emission spectrometric method

Titre manque

General Information

• Status: Not Published
• ICS: 77.120.20 - Magnesium and magnesium alloys
• Technical Committee: ISO/TC 79/SC 5 - Magnesium and alloys of cast or wrought magnesium
• Drafting Committee: ISO/TC 79/SC 5/WG 4 - Analysis of magnesium and magnesium alloys
• Current Stage: 5098 - Project deleted
• Start Date: 02-Nov-2023
• Completion Date: 13-Dec-2025

Overview

ISO/DTS 4188 specifies an ICP‑OES (inductively coupled plasma optical emission spectrometric) method for the determination of arsenic (As) in magnesium and magnesium alloys. Drafted by ISO/TC 79/SC 5 (Secretariat: SAC) in 2023, the document defines the analytical principle, required reagents and apparatus, sample preparation, calibration and result expression for arsenic mass fractions in the range 0.001% to 0.050% (mass fraction). The method is intended for alloys with limited rare‑earth and zirconium contents (e.g., Ce, Gd, Nd, Zr limits given in the standard).

Key topics and technical requirements

• Analytical principle: Dissolution of a prepared test sample in nitric and hydrochloric acids followed by nebulization into an ICP‑OES; measurement of arsenic emission intensity and quantification via a magnesium‑based calibration curve.
• Scope limits: Applicable for arsenic between 0.001% and 0.050% mass fraction; restricted to alloys with specified maximum contents of Ce, Gd, Nd and Zr.
• Reagents and standards: Use of analytical‑grade reagents and Grade 2 water (ISO 3696). The draft lists primary materials including pure magnesium and pure arsenic (purity > 99.99%), hydrochloric and nitric acids, and prepared arsenic standard solutions (examples given: 1 g/L, 0.1 g/L, 0.01 g/L).
• Apparatus requirements: An ICP‑OES instrument with specification of measurement wavelength(s), limit of detection, and calibration linearity criteria (sections dedicated to wavelength selection, LOD, and calibration curve performance).
• Quality and reporting: Sections cover sampling and sample preparation, calibration procedure, measurement steps, method of calculation, precision information, limit of detection (Annex A) and test report requirements. Informative annexes provide precision test details and graphical representation of precision data.
• Normative references: Includes ISO 648, ISO 1042 (laboratory glassware) and ISO 3696 (water for analytical use); related material safety and lab practice references implied.

Practical applications and users

• Who uses it: Analytical chemistry laboratories, metallurgical QC labs, material certification bodies, and manufacturers of magnesium products who require robust arsenic quantification.
• Why it matters: Arsenic is a hazardous impurity that affects health and the environment. This method supports compliance and material safety assessments-particularly for magnesium components intended for food, medical, or other safety‑sensitive applications.
• Use cases: Routine quality control of raw magnesium and alloys, acceptance testing of incoming batches, regulatory testing tied to impurity limits (e.g., the combined Cd/Hg/As/Cr threshold in ISO 8287), and investigative analysis when impurity sources are suspected.

Related standards

• ISO 8287 (impurity limits for Mg alloys)
• ISO 3696 (water for analytical laboratory use)
• ISO 648, ISO 1042 (laboratory glassware)

Keywords: ISO/DTS 4188, magnesium alloys, arsenic determination, ICP‑OES, inductively coupled plasma optical emission spectrometry, limit of detection, calibration curve, sample preparation, magnesium‑based calibration.

Standards Content (Sample)

1.1.1 ISO TC 79/SC 5
1.1.2 Date: 2023-05
ISO/TC 79/SC 5
Secretariat: SAC
Date: 2023-07-11
Magnesium and magnesium alloys – — Determination of arsenic –— Inductively
coupled plasma optical emission spectrometric method

Magnésium et alliages de magnésium - Détermination de l'arsenic - Méthode par
spectrométrie d'émission atomique avec source à plasma induit

FDIS stage
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©ISO 2018 - All rights reserved

Contents
Foreword . vii
Introduction . ix
1 Scope . １
2 Normative references . １
3 Terms and definitions . １
4 Principle . １
5 Reagents . ２
6 Apparatus . ２
6.1 Inductively coupled plasma optical emission spectrometer . ３
6.1.1 General . ３
6.1.2 Wavelength . ３
6.1.3 Limit of detection . ３
6.1.4 Linearity of the calibration curve . ３
7 Sampling and sample preparation . ３
8 Procedure. ３
8.1 General . ３
8.2 Test sample . ３
8.3 Preparation of the test solution . ４
8.4 Preparation of the calibration solutions . ４
8.5 Adjustment of the apparatus . ４
8.6 Measurement of the calibration solutions . ４
8.7 Calibration curve . ５
8.8 Measurement of the test solution . ５
9 Expression of results . ５
9.1 Method of calculation . ５
9.2 Precision . ５
10 Test report . ６
Annex A (normative) Limit of detection . ７
Annex B (informative) Information on the precision test . 1
Annex C (informative) Graphical representation of precision data . 3
Bibliography . 6

Foreword . iv

Introduction . v
1 Scope. １
2 Normative references . １
3 Terms and definitions . １
4 Principle . １
5 Reagent . １
6 Apparatus . ２
6.1 Inductively coupled plasma optical emission spectrometer . ２
6.1.1 General . ２
6.1.2 Wavelength . ３
6.1.3 Limit of detection . ３
6.1.4 Linearity of the calibration curve . ３
7 Sampling and sample preparation . ３
8 Procedure . ３
8.1 General . ３
8.2 Test sample . 错误！未定义书签。
8.3 Preparation of the test solution . ３
8.4 Preparation of the calibration solutions . ４
8.5 Adjustment of the apparatus . ４
8.6 Measurement of the calibration solutions . ４
8.7 Calibration curve . ４
8.8 Measurement of the test solution . ５
9 Expression of results . ５
9.1 Method of calculation . ５
9.2 Precision . ５
10 Test report . ５
Annex A (normative) Limit of detection . ７
Annex B (normative) Information on the precision test . ８
Annex C (informative) Graphical representation of precision data . ９
Bibliography. １０

©ISO 2018 - All rights reserved

Foreword
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This document was prepared by Technical Committee ISO/TC 79, Light metals and their alloys,
Subcommittee SC 5, Magnesium and alloys of cast or wrought magnesium.

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©ISO 2018 - All rights reserved

Introduction
Magnesium and magnesium alloys are one kind of light metallic materials and show several advantageous
properties, such as low density, high specific stiffness and strength, good damping capacity, castability,
weldability and machinability, etc. Arsenic as one of the hazardous impurities has badnegative effects on
the environment and the health, so its content mustand needs to be strictly controlled. The sum of the mass
contents of cadmium (Cd), mercury (Hg), arsenic (As) and chromium (Cr) given in ISO 8287 is defined to
be less than 0,01 % in magnesium and its alloys, which mustneeds to be inspected if used in food and
medicine fields.
©ISO 2018 - All rights reserved ix
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