ISO 6561-1:2005

SLOVENSKI STANDARD
SIST ISO 6561-1:2011
01-junij-2011
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SIST ISO 6561:1995
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Fruits, vegetables and derived products -- Determination of cadmium content -- Part 1:
Method using graphite furnace atomic absorption spectrometry
Fruits, légumes et produits dérivés -- Détermination de la teneur en cadmium -- Partie 1:
Méthode par spectrométrie d'absorption atomique avec four en graphite
Ta slovenski standard je istoveten z: ISO 6561-1:2005
ICS:
67.080.01 Sadje, zelenjava in njuni Fruits, vegetables and
proizvodi na splošno derived products in general
SIST ISO 6561-1:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 6561-1:2011

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SIST ISO 6561-1:2011


INTERNATIONAL ISO
STANDARD 6561-1
First edition
2005-02-01

Fruits, vegetables and derived
products — Determination of cadmium
content —
Part 1:
Method using graphite furnace atomic
absorption spectrometry
Fruits, légumes et produits dérivés — Détermination de la teneur en
cadmium —
Partie 1: Méthode par spectrométrie d'absorption atomique avec four en
graphite




Reference number
ISO 6561-1:2005(E)
©
ISO 2005

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SIST ISO 6561-1:2011
ISO 6561-1:2005(E)
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ii © ISO 2005 – All rights reserved

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SIST ISO 6561-1:2011
ISO 6561-1:2005(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
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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 6561-1 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 3, Fruit and
vegetable products.
This first edition of ISO 6561-1, together with ISO 6561-2:2004, cancels and replaces ISO 6561:1983, which
has been technically revised.
ISO 6561 consists of the following parts, under the general title Fruits, vegetables and derived products —
Determination of cadmium content:
 Part 1: Method using graphite furnace atomic absorption spectrometry
 Part 2: Method using flame atomic absorption spectrometry

© ISO 2005 – All rights reserved iii

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SIST ISO 6561-1:2011

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SIST ISO 6561-1:2011
INTERNATIONAL STANDARD ISO 6561-1:2005(E)

Fruits, vegetables and derived products — Determination of
cadmium content —
Part 1:
Method using graphite furnace atomic absorption spectrometry
1 Scope
This part of ISO 6561 specifies a graphite furnace atomic absorption spectrometric method for the
determination of the cadmium content of fruits, vegetables and derived products.
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 5515:1979, Fruits, vegetables and derived products — Decomposition of organic matter prior to
analysis — Wet method
3 Principle
Organic matter is decomposed by a wet method and the dissolved cadmium is determined by graphite furnace
atomic absorption spectrometry.
4 Reagents
Use only reagents of recognized analytical grade, and which, with the exception of the cadmium sulfate
hydrate (4.8) and the cadmium standard solutions (4.9 and 4.10), shall be free from cadmium. Use only water
which has been double-distilled in borosilicate glass apparatus, or water of at least equivalent purity.
4.1 Sulfuric acid, concentrated, ρ = 1,84 g/ml.
20
4.2 Nitric acid, ρ = 1,38 g/ml.
20
4.3 Perchloric acid, ρ = 1,67 g/ml.
20
4.4 Sulfuric acid, dilute, 10 % (volume fraction).
4.5 EDTA (ethylenediaminetetraacetic acid, disodium salt), 0,20 mol/l solution.
4.6 Buffer solution, pH 9.
Dissolve 5,4 g of ammonium chloride in water and transfer to a 100 ml one-mark volumetric flask. Add 35 ml
of 25 % (volume fraction) ammonia solution and make up to the mark with water.
© ISO 2005 – All rights reserved 1

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SIST ISO 6561-1:2011
ISO 6561-1:2005(E)
4.7 Eriochrome black T, 1 % (mass fraction) mixture with sodium chloride.
4.8 Cadmium sulfate hydrate (3CdSO ·8H O).
4 2
The titre of the cadmium sulfate shall be verified as follows.
Weigh exactly 102,6 mg of cadmium sulfate hydrate, transfer quantitatively to a conical flask with water and
shake until dissolved. Add 5 ml of the buffer solution (4.6) and about 20 mg of the eriochrome black T mixture
(4.7). Titrate with the EDTA solution (4.5) until the end point is reached as indicated by a change of colour to
blue.
The volume of EDTA used shall be 20 ml. If the volume differs slightly, correct the mass of cadmium sulfate
used to prepare the standard cadmium solution (4.9) accordingly.
4.9 Cadmium standard solution, corresponding to 1,0 mg of cadmium per mililitre.
4.10 Cadmium standard solution, containing 0,05 mg of cadmium per litre.
Transfer, by means of a pipette, 10 ml of the cadmium standard solution (4.9) to 1 000 ml one-mark volumetric
flask and dilute to the mark with water. Transfer 5 ml of this solution to another 1 000 ml one-mark volumetric
flask and dilute to the mark with the dilute sulfuric acid (4.4).
1 ml of this standard solution contains 0,05 µg of
...