Ferrovanadium -- Determination of vanadium content -- Potentiometric method

ISO 6467:2018 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.

Ferrovanadium -- Dosage du vanadium -- Méthode potentiométrique

General Information

Status
Published
Publication Date
30-Jan-2018
Technical Committee
Drafting Committee
Current Stage
6060 - International Standard published
Start Date
10-Jan-2018
Completion Date
31-Jan-2018
Ref Project

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INTERNATIONAL ISO
STANDARD 6467
Second edition
2018-01
Ferrovanadium — Determination of
vanadium content — Potentiometric
method
Ferrovanadium — Dosage du vanadium — Méthode
potentiométrique
Reference number
ISO 6467:2018(E)
ISO 2018
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ISO 6467:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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ii © ISO 2018 – All rights reserved
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ISO 6467:2018(E)
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

© ISO 2018 – All rights reserved iii
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ISO 6467:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

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World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

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
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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.
© ISO 2018 – All rights reserved 1
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