ISO 4941:2024 PDF

Name: ISO 4941:2024 — Steel and iron — Determination of molybdenum content — Thiocyanate spectrophotometric method
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Steel and iron — Determination of molybdenum content — Thiocyanate spectrophotometric method

Название (английский):

ISO 4941:2024

Steel and iron — Determination of molybdenum content — Thiocyanate spectrophotometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 23 июля 2024 г.
Издание:: ISO IS 4941 edition 3 version 1
ICS:: 77.080.01

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Описание (английский):

This document specifies a thiocyanate spectrophotometric method for the determination of molybdenum contents in steel and iron. The method is applicable to molybdenum mass fractions between 0,005 % and 0,125 %. Vanadium and tungsten interfere with the measurement if, because of their contents, the V/Mo ratio is greater than 16 or the W/Mo ratio is greater than 8.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4941:2024 - Steel and iron - Determination of molybdenum content - Thiocyanate spectrophotometric method - specifies a validated laboratory procedure for measuring molybdenum (Mo) content in steel and iron. The standard covers sample dissolution, formation of a thiocyanate-based coloured complex, organic extraction and spectrophotometric measurement (around 470 nm) for Mo mass fractions between 0.005 % and 0.125 %. This is the third edition, technically revised from the 1994 version.

Key topics and requirements

Scope and applicability: Measurement range 0.005–0.125 % Mo in steel and iron.

Analytical principle: Dissolve sample, oxidize carbides, form a molybdenum–thiocyanate coloured complex, extract into butyl acetate, and measure absorbance at ~470 nm.

Interferences: Vanadium and tungsten interfere when V/Mo > 16 or W/Mo > 8; the standard documents how these affect results.

Reagents & standards: Specifies analytical-grade reagents and prepared solutions (acid mixtures, ammonium thiocyanate, L(+)-ascorbic acid, copper(II) solutions, tin(II)-copper(II) chloride, Mo standard solutions).

Apparatus: Requires class A glassware, a separating funnel (100 ml) and a spectrophotometer with 10 mm or 20 mm optical path length cells.

Procedure highlights: Typical test portion ≈ 1.00 g; use ISO 14284 for sampling/preparation; steps include test and compensating solutions, extraction of the organic layer, and calibration curve establishment.

Safety: Warning on perchloric acid vapour - explosion hazard in presence of organics, ammonia or nitrous fumes.

Quality control: Calibration curve preparation, use of compensating solution (pure iron) to correct background absorption, and updated precision data included.

Applications

ISO 4941:2024 is intended for:

Steel and iron producers for alloy certification and process control.

Metallurgical and chemical testing laboratories performing routine compositional analysis.

Quality assurance teams verifying conformity to material specifications.

R&D and failure analysis where accurate Mo quantification is required for metallurgical interpretation.

Practical uses include quality control of Mo-bearing steels, verification of supplier material certificates, and traceability in analytical records.

Related standards

ISO 14284 - Sampling and preparation of samples for chemical composition determination

ISO 3696 - Water for analytical laboratory use

ISO 385 / ISO 648 / ISO 1042 - Laboratory glassware (burettes, pipettes, volumetric flasks)

ISO 4800 - Separating funnels

Keywords: ISO 4941:2024, molybdenum determination, thiocyanate spectrophotometric method, steel and iron analysis, spectrophotometry, Mo content, interference V/Mo W/Mo, calibration curve.

ISO 4941:2024 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Related standards

Технические детали

SIST EN ISO 14284:2023

Steel and iron - Sampling and preparation of samples for the determination of chemical composition (ISO 14284…

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)

BS EN ISO 385:2005

Laboratory glassware. Burettes.

ISO 6487:2015/Amd 1:2017

Road vehicles — Measurement techniques in impact tests — Instrumentation — Amendment 1

BS EN ISO 10427-1:2024

Oil and gas industries including lower carbon energy. Equipment for well cementing. Casing bow-spring central…

SIST ISO 4800:2002

Laboratory glassware -- Separating funnels and dropping funnels