SIST EN ISO 11212-4:1998

Starch and derived products - Heavy metals content - Part 4: Determination of cadmium content by atomic absorption spectrometry with electrothermal atomization (ISO 11212-4:1997)

Stärke und Stärkederivate - Schwermetallgehalt - Bestimmung des Cadmiumgehaltes durch Atomabsorptionsspektrometrie mit elektrothermischer Atomisierung (ISO/DIS 11212-4:1996)

Amidons, fécules et produits dérivés - Teneur en métaux lourds - Partie 4: Détermination de la teneur en cadmium par spectrométrie d'absorption atomique avec atomisation électrothermique (ISO 11212-4:1997)

La présente partie de l'ISO 11212 prescrit une méthode pour la détermination de la teneur en cadmium dans les amidons, fécules, produits dérivés et sous-produits d'amidonnerie par spectrométrie d'absorption atomique avec atomisation électrothermique. Le nombre de paramètres opératoires impliqués en atomisation électrothermique étant considérablement plus grand qu'en atomisation dans la flamme, il est donc impossible de proposer une méthode détaillée susceptible de garantir l'obtention de résultats satisfaisants sur tous les types d'appareils actuellement commercialisés. Il convient donc que chaque analyste procède à l'optimisation des conditions d'utilisation de son propre instrument sur la base des recommandations générales ou particulières qui lui sont données.

Škrob in škrobni derivati - Delež težkih kovin - 4. del: Določevanje kadmija po metodi atomske absorpcijske spektrometrije z elektrotermijsko atomizacijo (ISO 11212-4:1997)

General Information

• Status: Published
• Publication Date: 30-Nov-1998
• ICS: 67.180.20 - Starch and derived products
• Technical Committee: KŽP - Agricultural food products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-1998
• Due Date: 01-Dec-1998
• Completion Date: 01-Dec-1998
• Ref Project: EN ISO 11212-4:1997 - Starch and derived products - Heavy metals content - Part 4: Determination of cadmium content by atomic absorption spectrometry with electrothermal atomization (ISO 11212-4:1997)

Relations

• Parent: SIST EN ISO 11212-1:1998 - Starch and derived products - Heavy metals content - Part 1: Determination of arsenic content by atomic absorption spectrometry (ISO 11212-1:1997)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 11212-4:1998
01-december-1998
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Starch and derived products - Heavy metals content - Part 4: Determination of cadmium
content by atomic absorption spectrometry with electrothermal atomization (ISO 11212-
4:1997)
Stärke und Stärkederivate - Schwermetallgehalt - Bestimmung des Cadmiumgehaltes
durch Atomabsorptionsspektrometrie mit elektrothermischer Atomisierung (ISO/DIS
11212-4:1996)
Amidons, fécules et produits dérivés - Teneur en métaux lourds - Partie 4: Détermination
de la teneur en cadmium par spectrométrie d'absorption atomique avec atomisation
électrothermique (ISO 11212-4:1997)
Ta slovenski standard je istoveten z: EN ISO 11212-4:1997
ICS:
67.180.20 Škrob in izdelki iz njega Starch and derived products
SIST EN ISO 11212-4:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11212-4:1998

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SIST EN ISO 11212-4:1998

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SIST EN ISO 11212-4:1998

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SIST EN ISO 11212-4:1998
INTERNATIONAL ISO
STANDARD 11212-4
First edition
1997-03-15
Starch and derived products - Heavy
metals content -
Part 4:
Determination of Cadmium content by atomic
absorption spectrometry with electrothermal
atomization
Amidons, f&ules et produits d&iv& - Teneur en mktaux lourds -
Partie 4: Determination de Ia teneur en Cadmium par spectrometrie
d ’absorption atomique avec atomisa tion klectrothermique
Reference number
ISO 11212-4:1997(E)

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SIST EN ISO 11212-4:1998
ISO 11212=4:1997(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. Esch 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 11212-4 was prepared by Technical Committee
ISO/TC 93, Starch (including derivatives and by-products).
ISO 11212 consists of the following Parts, under the general title Starch
and derived products - Heavy metals content.
- Part 1: Determination of arsenic content by a tomic absorption
spectrometry
mercury content by atomic absorption
- Part 2: Determination of
spectrometry
- Par? 3: Determination of lead content by atomic absorption
spectrometry with electrothermal atomization
- Part 4: Determination of Cadmium content by atomic absorption
spectrometry with electrothermal atomization
Annex A of this part of ISO 11212 is for information only.
0 ISO 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Internet central @ iso.ch
x.400 c=ch; a=40Onet; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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SIST EN ISO 11212-4:1998
ISO 11212-4: 1997(E)
INTERNATIONAL STANDARD @ ISO
Starch and derived products - Heavy metals content -
Part 4:
Determination of Cadmium content by atomic absorption spectrometry
with electrothermal atomization
1 Scope
This patt of ISO 11212 specifies a method for the determination of the Cadmium content of starch, including
derivatives and by-products, by atomic absorption spectrometry with electrothermal atomization.
The number of Parameters for the procedure involved in the electrothermal atomization is far larger than in flame
atomization; it is thus impossible to propose a comprehensive method likely to ensure the attainment of satisfactory
results on all types of apparatus currently available. Esch analyst should therefore optimize the conditions of use of
his/her own apparatus on the basis of general or particular instructions.
2 Definition
For the purposes of this patt of ISO 11212, the following definition applies.
2.1 Cadmium content: Quantity of Cadmium determined in accordance with the conditions specified in this
method and expressed as Cadmium (Cd), in micrograms per kilogram of the product as received.
3 Principle
Wet digestion of the organic matrix. Injection of an aliquot portion of digested Sample, in the presence of a matrix
modifier, into the furnace of an electrothermal atomization atomic absorption spectrometer.
Measurement of the absorbance at a wavelength of 228,8 nm.
Determination of the concentration of Cadmium in the Sample by means of a calibration curve.
4 Reagents
Use only reagents of recognized analytical grade and distilled water or water of equivalent purity.
4.1 Nitrit acid (pzO = 1,38 g/ml).
4.2 Hydrogen Peroxide, 30 % (WV) solution.
4.3 Matrix modifier, consisting of a 1 g/l Solution of Palladium nitrate.

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SIST EN ISO 11212-4:1998
@ ISO
ISO 11212=4:1997(E)
4.4 Cadmium Standard Solution, 1 g/l.
Standard solutions are commercially available at this concentration. These solutions may also be prepared by
weighing and dissolving the salt or metal of known purity.
4.5 Calibration salutions
Before each series of measurements, prepare from the Standard Cadmium Solution (4.4) at least five calibration
solutions covering the range of concentrations to be determined. 100 ml of each calibration Solution shall contain
75 ml of nitric acid (4.1) and 20 ml of the matrix modifier Solution (4.3) if the latter is not distributed by the automatic
injection device.
5 Apparatus
products (such as nitric acid) and rinsed
All the glassware used shall be previously washed by means of suitable
with distilled wate r to eli minate a ny trace of Cadmium.
Use ordinary laboratory apparatus and, in particular, the following.
5.1 Digestion apparatus (see figure l), made of borosilicate glass and consisting of three elements terminating
with conical ground joints (5.1 .l to 5.1.3).
51.1 Soxhlet extraction tube, of capacity 200 ml, equipped with a stopcock and a lateral tube connected directly
to the flask (5.1.3).
51.2 Cooling apparatus, 35 cm long, connected to the top of the Soxhlet extraction tube (5.1 .l).
51.3 Round-bottom flask, of capacity 250 ml, connected to the lower patt of the Soxhlet extraction tube (5.1 .l).
is under reflux; when it is closed, the Soxhlet extraction tube (5.1 .l) retains
When the stopcock is open, the device
the condensed water and acid vapours.
5.2 Atomic absorption spectrometer, consisting of five elements (5.2.1 to 5.2.5).
52.1 High-resolution monochromator, allowing a 0,2 nm bandwidth slit.
5.2.2 Correcting device for non-specific absorption.
5.2.3 Measuring and photoelectric reception device, with a response time not exceeding about IO ms.
5.2.4 Detector and Signal processing System
...