ISO 6467:2018

INTERNATIONAL ISO
STANDARD 6467
Second edition
2018-01
Ferrovanadium — Determination of
vanadium content — Potentiometric
method
Ferrovanadium — Dosage du vanadium — Méthode
potentiométrique
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Sample . 3
8 Procedure. 3
9 Expression of results . 3
10 Precision . 4
10.1 Expression of precision . 4
10.2 Calculation of final result . 4
11 Test report . 4
Annex A (informative) Original data from the verification test . 6
Annex B (informative) Graphical representation of the precision data . 7
Annex C (informative) Flow sheet for the procedure for the acceptance of analytical value
for test samples . 8
Bibliography . 9
Foreword
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URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 132, Ferroalloys.
This second edition cancels and replaces the first edition (ISO 6467:1980), which has been technically
revised. Changes have been made to the vanadium range, the procedure and the precision.
iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 6467:2018(E)
Ferrovanadium — Determination of vanadium content —
Potentiometric method
1 Scope
This document specifies a potentiometric method for the determination of the vanadium content of
ferrovanadium.
The method is applicable to vanadium contents between 35,0 % and 85,0 % (mass fraction) in
ferrovanadium.
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 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 3713, Ferroalloys — Sampling and preparation of samples — General rules
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
4 Principle
Dissolution of a test portion with nitric and sulfuric acids. Cold oxidation of the vanadium(IV) to
vanadium(V) by a slight excess of potassium permanganate. Destruction of the excess of potassium
permanganate by potassium nitrite, the excess of the latter being itself destroyed by urea. Reduction of
the vanadium(V) to vanadium(IV) by iron(II) in a potentiometric titration.
5 Reagents
During the analysis, unless otherwise specified, use only reagents of recognized analytical grade and
only grade 2 water as specified in ISO 3696.
5.1 Urea.
5.2 Nitric acid, ρ 1,38 to 1,42 g/ml.
5.3 Phosphoric acid.
...