SIST ISO 936:2003

SLOVENSKI STANDARD
SIST ISO 936:2003
01-september-2003
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Meat and meat products -- Determination of total ash
Viande et produits à base de viande -- Dosage des cendres totales
Ta slovenski standard je istoveten z: ISO 936:1998
ICS:
67.120.10 Meso in mesni proizvodi Meat and meat products
SIST ISO 936:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 936:2003

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SIST ISO 936:2003
INTERNATIONAL ISO
STANDARD 936
Second edition
1998-08-01
Meat and meat products — Determination
of total ash
Viande et produits à base de viande — Dosage des cendres totales
A
Reference number
ISO 936:1998(E)

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SIST ISO 936:2003
ISO 936:1998(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.
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.
International Standard ISO 936 was prepared by Technical Committee
ISO/TC 34, Agricultural food products, Subcommittee SC 6, Meat and meat
products.
This second edition cancels and replaces the first edition (ISO 936:1978),
which has been technically revised.
Annex A of this International Standard is for information only.
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii

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SIST ISO 936:2003
©
INTERNATIONAL STANDARD  ISO ISO 936:1998(E)
Meat and meat products — Determination of total ash
1 Scope
This International Standard specifies a method for the determination of the total ash from all kinds of meat and meat
products, including poultry.
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the edition indicated was valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
3 Definition
For the purposes of this International Standard, the following definition applies.
3.1
total ash from meat and meat products
mass of the residue obtained after incineration at a temperature of (550 ± 25) °C under the operating conditions
specified in this International Standard, divided by the mass of the test portion
NOTE The mass fraction of ash is usually expressed as a percentage.
4 Principle
A test portion is dried, carbonized and then incinerated at (550 ± 25) °C. After cooling, the mass of the residue is
determined.
5 Reagents
Use only reagents of recognized analytical grade, unless otherwise specified.
5.1 Water, complying with at least grade 3 in accordance with ISO 3696.
1

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SIST ISO 936:2003
©
ISO
ISO 936:1998(E)
5.2 Hydrogen peroxide, 30 %.
6 Apparatus
Usual laboratory apparatus and, in particular, the following.
6.1 Mechanical or electrical equipment capable of homogenizing the laboratory sample.
This includes a high-speed rotational cutter, or a mincer fitted with a plate with apertures not exceeding 4,0 mm in
diameter.
6.2 Dish, flat-bottomed, made of porcelain, quartz or metal (e.g. nickel, platinum, stainless steel) or of other
material unaffected by the conditions of the test, with a diameter of at least 60 mm, and inclined walls of height at
least 25 mm.
6.3 Muffle furnace, electrically heated and equipped with a programmable time-temperature controller, and
capable of being maintained at (550 ± 25) °C.
6.4 Desiccator, containing an efficient desiccant.
6.5 Analytical balance, capable of weighing to the nearest 0,1 mg.
6.6 Drying oven, capable of being maintained at (103 ± 2) °C (if the muffle furnace has no time-temperature
controller).
6.7 Electric hot-plate or a gas flame (if the muffle furnace has no time-temperature controller).
7 Sampling
Sampling is not part of the method specified in this International Standard. A recommended sampling method is
given in ISO 3100-1 [1].
It is important that the laboratory receive a sample which is truly representative and has not been damaged or
changed during transport or storage.
Start from a representative sample of at least 200 g. Store the sample in such a way that deterioration and change
in composition are prevented.
8 Preparation of test sample
Homogenize the laboratory sample with the appropriate equipment (6.1). Take care that the temperature of the
sample material does not rise above 25 °C. If a mincer is used, pass the sample at least twice through the
equipment.
Fill a suitable airtight container with the prepared sample. Close the container and store in such a way that
deterioration and change in composition are prevented. Analyse the sample as soon as practicable, but always
within 24 h after homogenization.
2

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SIST ISO 936:2003
©
ISO
ISO 936:1998(E)
9 Procedure
NOTE  If it is required to check whether the repeatability limit (see 11.2) is met, ca
...