EN ISO 7027-2:2019

SLOVENSKI STANDARD
01-maj-2019
1DGRPHãþD
SIST EN ISO 7027:2000
Kakovost vode - Ugotavljanje motnosti - 2. del: Semikvantitativne metode za
ocenjevanje prosojnosti vode (ISO 7027-2:2019)
Water quality - Determination of turbidity - Part 2: Semi-quantitative methods for the
assessment of transparency of waters (ISO 7027-2:2019)
Wasserbeschaffenheit - Bestimmung der Trübung - Teil 2: Semi-quantitative Verfahren
zur Beurteilung der Transparenz von Gewässern (ISO 7027-2:2019)
Qualité de l'eau - Détermination de la turbidité - Partie 2: Méthodes semi-quantitatives
pour l'évaluation de la transparence des eaux (ISO 7027-2:2019)
Ta slovenski standard je istoveten z: EN ISO 7027-2:2019
ICS:
13.060.60 Preiskava fizikalnih lastnosti Examination of physical
vode properties of water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7027-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2019
EUROPÄISCHE NORM
ICS 13.060.60 Supersedes EN ISO 7027:1999
English Version
Water quality - Determination of turbidity - Part 2: Semi-
quantitative methods for the assessment of transparency
of waters (ISO 7027-2:2019)
Qualité de l'eau - Détermination de la turbidité - Partie Wasserbeschaffenheit - Bestimmung der Trübung - Teil
2: Méthodes semi-quantitatives pour l'évaluation de la 2: Semi-quantitative Verfahren zur Beurteilung der
transparence des eaux (ISO 7027-2:2019) Transparenz von Gewässern (ISO 7027-2:2019)
This European Standard was approved by CEN on 6 January 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7027-2:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7027-2:2019) has been prepared by Technical Committee ISO/TC 147 "Water
quality" in collaboration with Technical Committee CEN/TC 230 “Water analysis” the secretariat of
which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2019, and conflicting national standards shall
be withdrawn at the latest by August 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 7027:1999.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 7027-2:2019 has been approved by CEN as EN ISO 7027-2:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 7027-2
First edition
2019-01
Water quality — Determination of
turbidity —
Part 2:
Semi-quantitative methods for the
assessment of transparency of waters
Qualité de l'eau — Détermination de la turbidité —
Partie 2: Méthodes semi-quantitatives pour l'évaluation de la
transparence des eaux
Reference number
ISO 7027-2:2019(E)
©
ISO 2019
ISO 7027-2:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 7027-2:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Laboratory . 2
4.1 General . 2
4.2 Measurement using the transparency testing tube . 2
4.2.1 Apparatus . 2
4.2.2 Sampling and samples. 2
4.2.3 Procedure . 3
4.2.4 Expression of results . 3
5 In situ methods (field methods) . 3
5.1 General . 3
5.2 Measurement using the transparency testing disc . 3
5.2.1 Apparatus . 3
5.2.2 Procedure . 4
5.2.3 Expression of results . 5
5.2.4 Estimation of the attenuation coefficient (in the marine environment) . 5
5.3 Determination of visibility by divers . 5
5.3.1 Apparatus . 5
5.3.2 Procedure . 6
5.3.3 Expression of results . 6
6 Test report . 6
Annex A (informative) Devices . 8
Annex B (informative) Interlaboratory field study results .10
Bibliography .12
ISO 7027-2:2019(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
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
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constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 2,
Physical, chemical and biochemical methods.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
This first edition of ISO 7027-2, together with ISO 7027-1:2016, cancels and replaces ISO 7027:1999,
which has been technically revised.
A list of all parts in the ISO 7027 series can be found on the ISO website.
iv © ISO 2019 – All rights reserved

ISO 7027-2:2019(E)
Introduction
Turbidity in waters is caused by the presence of undissolved and/or colloidal matter and small
organisms (for example bacteria, phyto- and zooplankton) present in the water. Turbidity changes the
lighting conditions in surface waters by absorption and scattering of the light and thus influences the
trophic status of these waters. For the indicative assessment of the lighting conditions of waters or the
transparency of the water, semi-quantitative methods can be used (Reference [2]).
Meas
...