GB/T 223.8-2025: Iron, steel and alloy - Determination of aluminium content - Titrimetric method and spectrophotometric method

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Scope

This document describes the methods for determining the aluminum content in iron, steel and
alloy. sodium fluoride separation-EDTA titration, chrome azurol S direct spectrophotometry,
and copper-iron reagent separation-chrome azurol S spectrophotometry.
Method 1, sodium fluoride separation-EDTA titration, is suitable for determining the aluminum
content in iron, steel and alloy with a mass fraction of 0.50% ~ 10.00%. Method 2, chrome
azurol S direct spectrophotometry, is suitable for determining the acid-soluble aluminum
content in iron, steel and alloy with a mass fraction of 0.050% ~ 1.00%. Method 3, copper-iron
reagent separation-chrome azurol S spectrophotometry, is suitable for determining the
aluminum content in iron, steel and alloy with a mass fraction of 0.015% ~ 0.50%.

Basic Data

Standard ID	GB/T 223.8-2025 (GB/T223.8-2025)
Description (Translated English)	Iron, steel and alloy - Determination of aluminium content - Titrimetric method and spectrophotometric method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H11
Classification of International Standard	77.080.01
Word Count Estimation	22,224
Date of Issue	2025-08-29
Date of Implementation	2026-03-01
Older Standard (superseded by this standard)	GB/T 223.8-2000, GB/T 223.9-2008
Issuing agency(ies)	State Administration for Market Regulation; Standardization Administration of China