ISO 16878:2016
(Main)Iron ores — Determination of metallic iron content — Iron(III) chloride titrimetric method
Iron ores — Determination of metallic iron content — Iron(III) chloride titrimetric method
ISO 16878:2016 specifies a titrimetric method for the determination of the metallic iron content of reduced iron ores. This method is applicable to a concentration range of 57,5 % mass fraction to 90,5 % mass fraction of the metallic iron. NOTE The term "metallic iron" means those forms of iron not bonded to oxygen or not present as pyrite.
Minerais de fer — Dosage du fer métallique — Méthode titrimétrique au chlorure de fer(III)
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INTERNATIONAL ISO
STANDARD 16878
First edition
2016-07-01
Iron ores — Determination of metallic
iron content — Iron(III) chloride
titrimetric method
Minerais de fer — Dosage du fer métallique — Méthode titrimétrique
au chlorure de fer(III)
Reference number
ISO 16878:2016(E)
©
ISO 2016
---------------------- Page: 1 ----------------------
ISO 16878:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 16878:2016(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 Sampling and sample preparation . 3
8 Procedure. 3
8.1 Number of determinations . 3
8.2 Preparation of test portions . 3
8.3 Determination . 3
9 Expression of results . 4
9.1 Calculation of the metallic iron content . 4
9.2 General treatment of result . 4
9.2.1 Repeatability and permissible tolerances . 4
9.2.2 Determination of analytical result . 4
9.2.3 Between-laboratories precision . 4
9.2.4 Check for trueness . 5
9.2.5 Calculation of final result . 6
10 Test report . 6
Annex A (normative) Flowsheet of the procedure for the acceptance of test results .7
Annex B (informative) Derivation of precision statements . 8
Bibliography . 9
© ISO 2016 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 16878:2016(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
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
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 meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 102, Iron ore and direct reduced iron,
Subcommittee SC 2, Chemical analysis.
This first edition of ISO 16878 cancels and replaces ISO/TS 16878:2010, which has been technically
revised.
iv © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 16878:2016(E)
Iron ores — Determination of metallic iron content —
Iron(III) chloride titrimetric method
CAUTION — This International Standard may involve hazardous operations and equipment. This
International Standard does not purport to address all of the safety issues associated with its use.
It is the responsibility of the user of this International Standard to establish appropriate safety
and health practices and determine the applicability of regulatory limitations prior to its use.
1 Scope
This International Standard specifies a titrimetric method for the determination of the metallic iron
content of reduced iron ores.
This method is applicable to a concentration range of 57,5 % mass fraction to 90,5 % mass fraction of
the metallic iron.
NOTE The term “metallic iron” means those forms of iron not bonded to oxygen or not present as pyrite.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 385, Laboratory glassware — Burettes
ISO 1042, Laboratory glassware — One-mark volumetric flasks
ISO 10835, Direct reduced iron and hot briquetted iron — Sampling and sample preparation
ISO 11323, Iron ore and direct reduced iron — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11323 apply.
4 Principle
0 +2
Iron present in the oxidation state Fe in the sample is oxidized to Fe by the action of FeCl according
3
to the following reaction:
03++2
Fe +23Fe → Fe
+2
The Fe is titrated with potassium dichromate solution using the sodium diphenylaminesulfonate
indicator.
5 Reagents
During the analysis, use only reagents of recognized analytical reagent grade and only distilled water
or water of equivalent purity.
© ISO 2016 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 16878:2016(E)
5.1 Iron(III) chloride solution.
Add 250 g of iron(III) chloride hexahydrate to a 2 000 ml container holding 600 ml of water and agitate
until it is completely dissolved. Dilute with water to a volume of 1 l.
NOTE For better dissolution of the FeCl , it is recommended to use a warm water bath. The ideal condition is
3
a complete dissolution of the salt resulting in a translucent solution.
5.2 Sulfuric acid, 1,84 g/ml.
5.3 Phosphoric acid, 1,7 g/ml.
5.4 Solution 15 % sulfuric acid/15 % phosphoric acid mixture.
Add 1 000 ml of water to a 3 000 ml beaker. Place the beaker in a cool place and add slowly with stirring
300 ml of phosphoric acid (5.3). Allow cooling. Add slowly with stirring 300 ml of sulfuric acid (5.2)
and allow cooling. Dilute this mixture to 2 000 ml with stirring. Store the solution in a 2 000 ml high-
density polyethylene bottle or equivalent container.
5.5 Sodium diphenylaminesulfonate.
Dissolve 0,2 g of powdered sodium diphenylaminesulfonate (C H NHC H SO Na) in a sm
...
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16878
ISO/TC 102/SC 2 Secretariat: SA
Voting begins on: Voting terminates on:
2015-09-17 2015-12-17
Iron ores — Determination of metallic iron content —
Iron(III) chloride titrimetric method
Minerais de fer — Dosage du fer métallique — Méthode titrimétrique au chlorure de fer(III)
ICS: 73.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 16878:2015(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2015
---------------------- Page: 1 ----------------------
ISO/DIS 16878:2015(E) ISO/DIS 16878
Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Principle.1
4 Definitions .1
5 Reagents.2
6 Apparatus.2
7 Sampling and sample preparation.3
8 Procedure.3
8.1 Number of determinations.3
8.2 Preparation of test portions .3
8.3 Determination .3
9 Expression of results.3
9.1 Calculation of the metallic iron content .3
9.2 General treatment of result.4
9.2.1 Repeatability and permissible tolerances.4
9.2.2 Determination of analytical result.4
9.2.3 Between-laboratories precision.4
9.2.4 Check for trueness .5
9.2.5 Calculation of final result.6
10 Test report.6
Annex A (normative) Flowsheet of the procedure for the acceptance of test results.7
Annex B (informative) Derivation of precision statements.8
Bibliography.9
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
© ISO 2015 – All rights reserved iii
---------------------- Page: 2 ----------------------
ISO/DIS 16878
Contents Page
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Principle. 1
4 Definitions . 1
5 Reagents. 2
6 Apparatus . 2
7 Sampling and sample preparation . 3
8 Procedure . 3
8.1 Number of determinations . 3
8.2 Preparation of test portions . 3
8.3 Determination . 3
9 Expression of results . 3
9.1 Calculation of the metallic iron content . 3
9.2 General treatment of result. 4
9.2.1 Repeatability and permissible tolerances . 4
9.2.2 Determination of analytical result . 4
9.2.3 Between-laboratories precision . 4
9.2.4 Check for trueness . 5
9.2.5 Calculation of final result. 6
10 Test report . 6
Annex A (normative) Flowsheet of the procedure for the acceptance of test results . 7
Annex B (informative) Derivation of precision statements . 8
Bibliography . 9
© ISO 2015 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/DIS 16878
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 committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. 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 meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT)
see the following URL: Foreword - Supplementary information.
ISO 16878 was prepared by Technical Committee ISO/TC 102, Iron Ore and Direct Reduced Iron,
Subcommittee SC 02, Chemical Analysis.
This first edition of ISO 16878 cancels and replaces ISO/TS 16878:2010, which has been technically revised.
iv © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 16878
Iron ores — Determination of metallic iron content — Iron(III)
chloride titrimetric method
CAUTION — This standard may involve hazardous operations and equipment. This standard does not
purport to address all of the safety issues associated with its use. It is the responsibility of the user of
this International Standard to establish appropriate safety and health practices and determine the
applicability of regulatory limitations prior to its use.
1 Scope
This International Standard specifies a titrimetric method for the determination of the metallic iron content of
reduced iron ores.
This method is applicable to a concentration range of 57,5 % mass fraction to 90,5 % mass fraction of the
metallic iron.
NOTE The term "metallic iron" means those forms of iron not bonded to oxygen or not present as pyrite.
2 Normative references
The following referenced documents are indispensable for the application 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 10835, Direct
...
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