EN ISO 11969:1996

SLOVENSKI STANDARD
SIST EN ISO 11969:1998
01-januar-1998
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Water quality - Determination of arsenic - Atomic absorption spectrometric method
(hydride technique) (ISO 11969:1996)
Wasserbeschaffenheit - Bestimmung von Arsen - Atomabsorptionsspektrometrie
(Hydridverfahren) (ISO 11969:1996)
Qualité de l'eau - Dosage de l'arsenic - Méthode par spectrométrie d'absorption
atomique (technique hydrure) (ISO 11969:1996)
Ta slovenski standard je istoveten z: EN ISO 11969:1996
ICS:
13.060.50 3UHLVNDYDYRGHQDNHPLþQH Examination of water for
VQRYL chemical substances
SIST EN ISO 11969:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11969:1998

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SIST EN ISO 11969:1998

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SIST EN ISO 11969:1998

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SIST EN ISO 11969:1998

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SIST EN ISO 11969:1998

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SIST EN ISO 11969:1998
INTERNATIONAL IS0
STANDARD
11969
First edition
1996-07-15
Water quality - Determination of
arsenic - Atomic absorption
spectrometric method (hydride technique)
Qua/it6 de I ’eau - Dosage de / ‘arsenic - M&hode par spectromktrie
d ‘absorp tion a tomique (technique h ydrure)
Reference number
IS0 11969:1996(E)

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SIST EN ISO 11969:1998
IS0 11969:1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
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 IS0 11969 was prepared by Technical Committee
lSO/TC 147, l,&ter quality, Subcommittee SC 2, Physical, chemical,
biochemical methods.
Annexes A and B of this International Standard are for information only.
0 IS0 1996
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.
lnternationa I Organization for Standardization
Case Postal tzerland
e 56 l CH-1211 Geneve 20 l Swi
Printed in Switzerland

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SIST EN ISO 11969:1998
IS0 11969:1996(E)
INTERNATIONAL STANDARD 0 IS0
- Determination of arsenic - Atomic
spectrometric meth
(hydride technique)
WARNING - Arsenic and arsenic compounds are toxic and are recognized as human carcinogens.
Avoid any exposure by inhalation. Personal protection must be used in all cases where exposure
to arsenic or arsenic compounds is possible.
4 Scope 3 Principle
The method is based on the atomic absorption
This International Standard specifies a method for the
measurement of arsenic generated by the thermal
determination of arsenic including organically bound
arsenic in drinking waters, ground waters and surface decomposition of arsenic(l I I) hydride.
waters, in a concentration range from 1 pg/l to
Under the conditions of this method, only As(lIl) is
10 l-m
quantitatively converted to the hydride. To avoid er-
rors in determination, other oxidation states need to
Higher concentrations can be determined by using a
be converted to As(lll) prior to the determination.
suitable dilution of the water sample.
As(lIl) is reduced to gaseous arsenic(l II) hydride
(ASH,) by reaction with sodium tetrahydroborate in a
hydrochloric acid medium.
2 Normative references
The absorbance is determined at a wavelength of
The following standards contain provisions which,
193,7 nm.
through reference in this text, constitute provisions
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All standards
4 Reagents
are subject to revision, and parties to agreements
based on this International Standard are encouraged
During the analysis, use only reagents of recognized
to investigate the
...