ISO 334:2013
(Main)Solid mineral fuels — Determination of total sulfur — Eschka method
Solid mineral fuels — Determination of total sulfur — Eschka method
ISO 334:2013 specifies a reference method for determining the total sulfur content of hard coal, brown coals and lignites, and coke by the Eschka method.
Combustibles minéraux solides — Dosage du soufre total — Méthode Eschka
Trdna fosilna goriva - Določevanje celotnega žvepla - Eschkajeva metoda
Ta mednarodni standard določa referenčno metodo za določevanje celotne vsebnosti žvepla v črnem premogu, rjavem premogu in lignitu ter koksu z Eschkajevo metodo.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST ISO 334:2015
01-april-2015
1DGRPHãþD
SIST ISO 334:1998
7UGQDIRVLOQDJRULYD'RORþHYDQMHFHORWQHJDåYHSOD(VFKNDMHYDPHWRGD
Solid mineral fuels - Determination of total sulfur - Eschka method
Combustibles minéraux solides - Dosage du soufre total - Méthode Eschka
Ta slovenski standard je istoveten z: ISO 334:2013
ICS:
73.040 Premogi Coals
75.160.10 Trda goriva Solid fuels
SIST ISO 334:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 334:2015
---------------------- Page: 2 ----------------------
SIST ISO 334:2015
INTERNATIONAL ISO
STANDARD 334
Third edition
2013-10-15
Solid mineral fuels — Determination
of total sulfur — Eschka method
Combustibles minéraux solides — Dosage du soufre total —
Méthode Eschka
Reference number
ISO 334:2013(E)
©
ISO 2013
---------------------- Page: 3 ----------------------
SIST ISO 334:2015
ISO 334:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 334:2015
ISO 334:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
4.1 Eschka mixture . 1
4.2 Hydrochloric acid . 1
4.3 Potassium sulfate solution . 2
4.4 Barium chloride, approximately 85 g/l solution . 2
4.5 Methyl red indicator solution . 2
4.6 Ammonia . 2
4.7 Silver nitrate, 17 g/l solution . 2
5 Apparatus . 2
5.1 Analytical balance. 2
5.2 Graduated glassware . . 2
5.3 Electrically heated muffle furnace . 2
5.4 Crucible. 2
5.5 Flat plate . 2
5.6 Gooch crucible . 2
5.7 Air oven . 2
6 Preparation of test sample . 3
7 Procedure. 3
7.1 Test portion . 3
7.2 Charging the crucible . . 3
7.3 Ignition . 4
7.4 Recovering the residue . 4
7.5 Extraction . 4
7.6 Precipitation of barium sulfate . 4
7.7 Blank testing . 5
8 Expression of results . 5
9 Precision . 6
9.1 Repeatability limit . 6
9.2 Reproducibility limit . 6
10 Test report . 6
Annex A (informative) Derivation of factors used in the calculation in Clause 8 .7
© ISO 2013 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 334:2015
ISO 334:2013(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. 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. 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.
The committee responsible for this document is ISO/TC 27, Solid mineral fuels, Subcommittee SC 5,
Methods of analysis.
This third edition cancels and replaces the second edition (ISO 334:1992), of which it constitutes a
minor revision.
iv © ISO 2013 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 334:2015
ISO 334:2013(E)
Introduction
An alternative reference method to that specified in this International Standard is given in ISO 351:1996.
Instrumental methods for a more rapid determination of total sulfur are now available. If such a method
is to be used, it is important to demonstrate that the method is free from bias, when compared to this
reference method, and will give levels of repeatability and reproducibility which are the same as, or
better than, those quoted for the reference method (see Clause 9).
© ISO 2013 – All rights reserved v
---------------------- Page: 7 ----------------------
SIST ISO 334:2015
---------------------- Page: 8 ----------------------
SIST ISO 334:2015
INTERNATIONAL STANDARD ISO 334:2013(E)
Solid mineral fuels — Determination of total sulfur —
Eschka method
1 Scope
This International Standard specifies a reference method for determining the total sulfur content of
hard coal, brown coals and lignites, and coke by the Eschka method.
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 687, Solid mineral fuels — Coke — Determination of moisture in the general analysis test sample
ISO 1170, Coal and coke — Calculation of analyses to different bases
ISO 5068-1, Brown coals and lignites — Determination of moisture content — Part 1: Indirect gravimetric
method for total moisture
ISO 5069-2, Brown coals and lignites — Principles of sampling — Part 2: Sample preparation for
determination of moisture content and for general analysis
ISO 11722, Solid mineral fuels — Hard coal — Determination of moisture in the general analysis test sample
by drying in nitrogen
ISO 13909-4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples
3 Principle
A test portion is ignited in intimate contact with the Eschka mixture in an oxidizing atmosphere at
800 °
...
INTERNATIONAL ISO
STANDARD 334
Third edition
2013-10-15
Solid mineral fuels — Determination
of total sulfur — Eschka method
Combustibles minéraux solides — Dosage du soufre total —
Méthode Eschka
Reference number
ISO 334:2013(E)
©
ISO 2013
---------------------- Page: 1 ----------------------
ISO 334:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 334:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
4.1 Eschka mixture . 1
4.2 Hydrochloric acid . 1
4.3 Potassium sulfate solution . 2
4.4 Barium chloride, approximately 85 g/l solution . 2
4.5 Methyl red indicator solution . 2
4.6 Ammonia . 2
4.7 Silver nitrate, 17 g/l solution . 2
5 Apparatus . 2
5.1 Analytical balance. 2
5.2 Graduated glassware . . 2
5.3 Electrically heated muffle furnace . 2
5.4 Crucible. 2
5.5 Flat plate . 2
5.6 Gooch crucible . 2
5.7 Air oven . 2
6 Preparation of test sample . 3
7 Procedure. 3
7.1 Test portion . 3
7.2 Charging the crucible . . 3
7.3 Ignition . 4
7.4 Recovering the residue . 4
7.5 Extraction . 4
7.6 Precipitation of barium sulfate . 4
7.7 Blank testing . 5
8 Expression of results . 5
9 Precision . 6
9.1 Repeatability limit . 6
9.2 Reproducibility limit . 6
10 Test report . 6
Annex A (informative) Derivation of factors used in the calculation in Clause 8 .7
© ISO 2013 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 334:2013(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. 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. 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.
The committee responsible for this document is ISO/TC 27, Solid mineral fuels, Subcommittee SC 5,
Methods of analysis.
This third edition cancels and replaces the second edition (ISO 334:1992), of which it constitutes a
minor revision.
iv © ISO 2013 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 334:2013(E)
Introduction
An alternative reference method to that specified in this International Standard is given in ISO 351:1996.
Instrumental methods for a more rapid determination of total sulfur are now available. If such a method
is to be used, it is important to demonstrate that the method is free from bias, when compared to this
reference method, and will give levels of repeatability and reproducibility which are the same as, or
better than, those quoted for the reference method (see Clause 9).
© ISO 2013 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 334:2013(E)
Solid mineral fuels — Determination of total sulfur —
Eschka method
1 Scope
This International Standard specifies a reference method for determining the total sulfur content of
hard coal, brown coals and lignites, and coke by the Eschka method.
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 687, Solid mineral fuels — Coke — Determination of moisture in the general analysis test sample
ISO 1170, Coal and coke — Calculation of analyses to different bases
ISO 5068-1, Brown coals and lignites — Determination of moisture content — Part 1: Indirect gravimetric
method for total moisture
ISO 5069-2, Brown coals and lignites — Principles of sampling — Part 2: Sample preparation for
determination of moisture content and for general analysis
ISO 11722, Solid mineral fuels — Hard coal — Determination of moisture in the general analysis test sample
by drying in nitrogen
ISO 13909-4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples
3 Principle
A test portion is ignited in intimate contact with the Eschka mixture in an oxidizing atmosphere at
800 °C to remove combustible matter and to convert the sulfur to sulfate. This is then extracted with
hydrochloric acid solution and determined gravimetrically by precipitation with barium chloride.
4 Reagents
WARNING — Care should be exercised when handling the reagents, many of which are toxic
and corrosive.
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only
distilled water or water of equiva
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.