SIST EN ISO 8467:1998

SLOVENSKI STANDARD
SIST EN ISO 8467:1998
01-maj-1998
.DNRYRVWYRGH'RORþDQMHSHUPDJDQDWQHJDLQGHNVD,62
Water quality - Determination of permanganate index (ISO 8467:1993)
Wasserbeschaffenheit - Bestimmung des Permanganat-Index (ISO 8467:1993)
Qualité de l'eau - Détermination de l'indice de permanganate (ISO 8467:1993)
Ta slovenski standard je istoveten z: EN ISO 8467:1995
ICS:
13.060.50 3UHLVNDYDYRGHQDNHPLþQH Examination of water for
VQRYL chemical substances
SIST EN ISO 8467:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8467:1998

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SIST EN ISO 8467:1998

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SIST EN ISO 8467:1998

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SIST EN ISO 8467:1998
INTERNATIONAL ISO
STANDARD 8467
Second edition
1993-06-15
Water quality - Determination of
permanganate index
Qualit6 de I ’eau - Dhermina tion de I ’indice de permangana te
Reference number
ISO 8467:1993(E)

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SIST EN ISO 8467:1998
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 8467 was prepared by Technical Committee
ISOnC 147, Water quality, Sub-Committee SC 2, Physical, Chemical,
biochemical methods.
This second edition cancels and replaces the first edition
(ISO 8467:1986), of which it constitutes a technical revision.
0 ISO 1993
All rights reserved. No part of this publication may be reproduced or utiiized in any form or
by any means, electronie or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 8467:1998
ISO 8467:1993(E)
Introduction
The permanganate index is a conventional measure of the contamination
by organic and oxidizable inorganic matter in a water Sample. lt is primarily
intended for judging the quality of potable water and raw waters, such as
weil and surface waters. More heavily contaminated waters may be ana-
lysed, provided an appropriate pre-dilution step is adopted. The per-
manganate index tan be determined for waters containing less than
500 mg/1 of chloride ion. Reducing compounds such as iron(ll) salts, ni-
trites or hydrogen sulfide may contribute to the permanganate index but
are not classified as impurities.
The permanganate index cannot be considered as a measure of the the-
oretical Oxygen demand or the total content of organic matter. Many or-
ganic compounds are only partially oxidized in this test, as Oxidation is
generally incomplete. Volatile matter that evaporates before the addition
of permanganate is not included.
The method is not recommended for determining organic load in waste
waters; for this purpose the Chemical Oxygen demand should be deter-
mined as described in ISO 6060:1989, Water quality - Determination of
the Chemical Oxygen demand.
The method is simple and convenient for suweying the quality of a large
number of water samples.

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SIST EN ISO 8467:1998
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SIST EN ISO 8467:1998
INTERNATIONAL STANDARD ISO 8467:1993(E)
- Determination of permanganate
Water quality
index
duction of part of the permanganate by oxidizable
1 Scope
material in the Sample and determination of the con-
sumed permanganate by addition of an excess of
This International Standard specifies a method for the
oxalate Solution, followed by titration with permanga-
determination of the permanganate index of water. lt
nate.
is primarily intended for water for human consumption
and domestic use, drinking water, natura1 mineral
NOTE 1
The suggested maximum permanganate index
water, well and table water, as well as water from
of 10 mg/1 is equivalent to a consumption of approximately
swimming pools. lt is used for the determination of
60 % of the added permanganate by the non-diluted sam-
the Parameter “oxidizability ”. lt is applicable to waters
ple.
having a chloride ion concentration of less than
300 mg/l. Samples having a permanganate index over
10 mg/1 should be diluted before analysis. The lower 5 Reagents
limit of the Optimum range of the test is 0,5 mg/l.
During the analysis, use only reagents of recognized
analytical grade and only distilled water, water from a
2 Normative reference reverse osmosis or water of equivalent purity. DO not
use deionized water from an organic ion exchanger.
The following Standard contains provisions which,
NOTE 2
Non-reducing water tan be prepared as follows.
through reference in this text, constitute provisions
Add 10 ml of sulfuric acid (5.3) and a small excess of the
of this International Standard. At the time of publi-
potassium permanganate stock Solution (5.6) to 1 litre of
cation, the edition indicated was valid. All Standards
distilled water. Distil in an all-glass apparatus and discard the
are subject to revision, and Parties to agreements
first 100 ml of distillate. Store in a glass bottle with a glass
based on this International Standard are encouraged
stopper.
to investigate the possibility of applying the most re-
cent edition of the Standard indicated below. Mem-
The volume of the consumed potassium permanga-
bers of IEC and ISO maintain registers of currently
nate Standard Solution V. (see 8.4) shall not exceed
valid International Standards.
0,l ml, otherwise the procedure shall be repeated or
a water of lower organic content shall be used.
ISO 385-1: 1984, Laborstory glassware - Burettes -
Part 1: General requirements.
5.1 Sulfuric acid, p(H,SO,) = 1,84 g/ml, 18 mol/l.
3 Definition
5.2 Sulfuric acid, c(H,SO,) = 7,5 mol/l.
Add slowly, while stirring continuously, 420 ml of
3.1 permanganate index (of water): The mass
sulfuric acid (5.1) to 500 ml of water. Allow to cool
concentration of Oxygen equivalent to the amount of
and dilute to 1 litre.
permanganate ion consumed when a water Sample is
treated with that oxidant under defined conditions.
5.3 Sulfuric acid, c(H2S04) = 2 mol/l.
4 Principle Add slowly, while stirring continuously, 110 ml of
sulfuric acid (5.1) to about 500 ml of water. Slowly
add potassium permanganate Solution (5.7) until a
Heating of a Sample in a boiling water-bath with a
known amount of potassium permanganate and faint pink colour persists. Allow to cool, dilute with
water to 1 litre and mix.
sulfuric acid for a fixed period of time (10 min). Re-

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SIST EN ISO 8467:1998
ISO 8467:1993(E)
54 Sodium oxalate, stock Solution, c(Na&OJ = forming blank determinations until the values are ad-
mol/l. equately low and constant.
0 ’05
I
sodium oxalate at 120 “C for 2 h. Dissolve A blank value V. shall typ
...