SIST ISO 15238:2005

SLOVENSKI STANDARD
SIST ISO 15238:2005
01-november-2005
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Solid mineral fuels -- Determination of total cadmium content of coal
Combustibles minéraux solides -- Dosage du cadmium total dans le charbon
Ta slovenski standard je istoveten z: ISO 15238:2003
ICS:
75.160.10 Trda goriva Solid fuels
SIST ISO 15238:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 15238:2005

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SIST ISO 15238:2005


INTERNATIONAL ISO
STANDARD 15238
First edition
2003-12-01
Corrected version
2004-06-15


Solid mineral fuels — Determination of
total cadmium content of coal
Combustibles minéraux solides — Dosage du cadmium total dans le
charbon




Reference number
ISO 15238:2003(E)
©
ISO 2003

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SIST ISO 15238:2005
ISO 15238:2003(E)
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ii © ISO 2003 — All rights reserved

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SIST ISO 15238:2005
ISO 15238:2003(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 15238 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 5,
Methods of analysis.
In this corrected version of ISO 15238:2003, Table 1 has been amended by the replacement of the published
value of 0, 6ω − 1 for the Repeatability limit with the correct value of 0,16ω − 1.
Cd Cd
© ISO 2003 — All rights reserved iii

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SIST ISO 15238:2005
ISO 15238:2003(E)
Introduction
Cadmium occurs naturally in coal. It is an element that can potentially be released during the combustion
process.
Quantitative recovery can be achieved by strict adherence to the procedure set out in this International
Standard.
The method may also be suitable for other elements, including lead and arsenic, although the choice of matrix
modifier may vary.
iv © ISO 2003 — All rights reserved

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SIST ISO 15238:2005
INTERNATIONAL STANDARD ISO 15238:2003(E)

Solid mineral fuels — Determination of total cadmium content
of coal
1 Scope
This International Standard specifies a procedure for the determination of the total cadmium content of coal.
This procedure has not been validated with coals that spontaneously ignite. Prior to use with such sample
types, users should validate the method.
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 331, Coal — Determination of moisture in the analysis sample — Direct gravimetric method
ISO 1170, Coal and coke — Calculation of analyses to different bases
ISO 3696, Water for analytical laboratory use — Specifications and test methods
ISO 5068, Brown coals and lignites — Determination of moisture content — Indirect gravimetric method
ISO 5069-2, Brown coals and lignites — Principles of sampling — Part 2: Sample preparation for
determination of moisture content and for general analysis
ISO 13909-2, Hard coal and coke — Mechanical sampling — Part 2: Coal — Sampling from moving streams
3 Principle
The coal sample is ashed, followed by dissolution of the ash in a mixture of hydrochloric, nitric and
hydrofluoric acids. The cadmium species present are quantified by graphite furnace atomic absorption
spectroscopy.
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.
4.1 Water, conforming to the requirements of Grade 1 of ISO 3696.
4.2 Aqua regia solution. Mix 1 part by volume of concentrated nitric acid solution (relative density 1,42),
3 parts of concentrated hydrochloric acid solution (relative density 1,19), and 1 part water.
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SIST ISO 15238:2005
ISO 15238:2003(E)
4.3 Concentrated hydrofluoric acid solution (relative density 1,15).
WARNING — Hydrofluoric acid is an extremely aggressive chemical which shall be handled with care.
4.4 Boric acid solution, saturated. Dissolve 60 g of boric acid in 1 litre of hot water, cool and allow to
stand for three days before decanting the clear solution.
4.5 Cadmium standard stock solution, 10 µg/ml. Prepare the stock solution from a high purity metal
oxide or salt, having a purity greater than 99,9 %. Dilute to volume with 1 % (V/V) nitric acid solution.
NOTE The cadmium standard stock solution may also be prepared from commercially available certified cadmium
solution.
4.6 Cadmium standard solution, 0,1 µg/ml. Dilute 10,0 ml of cadmium standard stock solution (4.5) to
1,0 litre with 1 % (V/V) nitric acid solution.
5 Apparatus
5.1 Balance, cap
...