SIST EN ISO 7027-2:2019
(Main)Water quality - Determination of turbidity - Part 2: Semi-quantitative methods for the assessment of transparency of waters (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)
This document specifies the following semi-quantitative methods for the assessment of transparency
of waters:
a) measurement of visual range using the transparency testing tube (applicable to transparent and
slightly cloudy water), see Clause 4;
b) measurement of visual range in the upper water layers using the transparency testing disc
(especially applicable to surface, bathing water, waste water and often used in marine monitoring),
see 5.1;
c) measurement of visibility by divers in a destined depth, see 5.2.
NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.
Wasserbeschaffenheit - Bestimmung der Trübung - Teil 2: Semi-quantitative Verfahren zur Beurteilung der Transparenz von Gewässern (ISO 7027-2:2019)
Dieses Dokument legt die folgenden semi quantitativen Verfahren für die Beurteilung der Transparenz von Gewässern fest:
a) Messung der Sichtweite mithilfe des Transparenzprüfröhrchens (anwendbar für klares und leicht getrübtes Wasser), siehe Abschnitt 4;
b) Messung der Sichtweite der oberen Wasserschichten mithilfe der Sichtscheibe (speziell anwendbar für Oberflächengewässer, Badegewässer, Abwässer und oftmals in der Überwachung im maritimen Bereich), siehe 5.1;
c) Messung der Sichtweite mittels Sichtscheibe durch Taucher in einer vorgesehenen Tiefe, siehe 5.2.
ANMERKUNG Die quantitativen Verfahren unter Verwendung optischer Trübungsmessgeräte oder Nephelometer sind in ISO 7027 1 beschrieben.
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)
This document specifies the following semi-quantitative methods for the assessment of transparency of waters:
a) measurement of visual range using the transparency testing tube (applicable to transparent and slightly cloudy water), see Clause 4;
b) measurement of visual range in the upper water layers using the transparency testing disc (especially applicable to surface, bathing water, waste water and often used in marine monitoring), see 5.1;
c) measurement of visibility by divers in a destined depth, see 5.2.
NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.
Kakovost vode - Ugotavljanje motnosti - 2. del: Semikvantitativne metode za ocenjevanje prosojnosti vode (ISO 7027-2:2019)
Ta dokument določa naslednje semikvantitativne metode za ocenjevanje prosojnosti
vode:
a) merjenje vidnega območja z uporabo epruvete za preskušanje prosojnosti (uporablja se za prosojno in
rahlo motno vodo), glej točko 4;
b) merjenje vidnega območja v zgornjih slojih vode z uporabo diska za preskušanje prosojnosti
(uporablja se zlasti za površinsko, kopalno in odpadno vodo ter pogosto pri monitoringu morja),
glej točko 5.1;
c) merjenje vidljivosti, ki ga izvedejo potapljači na predvideni globini, glej točko 5.2.
OPOMBA: Kvantitativne metode z uporabo optičnih turbidimetrov ali nefelometrov so opisane v standardu ISO 7027-1.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 7027-2:2019
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
SIST EN ISO 7027-2:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 7027-2:2019
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SIST EN ISO 7027-2:2019
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.
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SIST EN ISO 7027-2:2019
EN ISO 7027-2:2019 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 7027-2:2019
EN ISO 7027-2:2019 (E)
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.
3
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SIST EN ISO 7027-2:2019
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SIST EN ISO 7027-2:2019
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
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SIST EN ISO 7027-2:2019
ISO 7027-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 7027-2:2019
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 2019 – All rights reserved iii
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SIST EN ISO 7027-2:2019
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
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.
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).
Any trade name used in this document is information given for the convenience of users and does not
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
---------------------- Page: 10 ----------------------
SIST EN ISO 7027-2:2019
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]).
Measurements of transparency can be affected by the presence of dissolved light-absorbing substances
(substances imparting colour) as well as by particles (such as sediments).
In semi-quantitative methods such as the determination of transparency depth by Secchi disc,
reflections on the water surface can cause interferences. These are often dependent on the light and
wind conditions.
NOTE Results of a field study for the validation of this document is given in Annex B.
© ISO 2019 – All rights reserved v
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SIST EN ISO 7027-2:2019
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SIST EN ISO 7027-2:2019
INTERNATIONAL STANDARD ISO 7027-2:2019(E)
Water quality — Determination of turbidity —
Part 2:
Semi-quantitative methods for the assessment of
transparency of waters
WARNING — Working in or around water is inherently dangerous. Persons using this document
should be familiar with normal laboratory practice. This document does not purport to address
all of the safety problems, if any, associated with its use. It is the responsibility of the user to
establish appropriate safety and health practices.
IMPORTANT — It is absolutely essential that tests conducted in accordance with this document
be carried out by suitably qualified and trained staff.
1 Scope
This document specifies the following semi-quantitative methods for the assessment of transparency
of waters:
a) measurement of visual range using the transparency testing tube (applicable to transparent and
slightly cloudy water), see Clause 4;
b) measurement of visual range in the upper water layers using the transparency testing disc
(especially applicable to surface, bathing water, waste water and often used in marine monitoring),
see 5.1;
c) measurement of visibility by divers in a destined depth, see 5.2.
NOTE The quantitative methods using optical turbidimeters or nephelometers are described in ISO 7027-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including amendments) applies.
CIE S 017/E, ILV: International Lighting Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in CIE S 017 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org ./obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
transparency
permeability with respect to electromagnetic waves, here especially of light
Note 1 to entry: In this document, transparency is used in terms of visibility in waters.
© ISO 2019 – All rights reserved 1
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SIST EN ISO 7027-2:2019
ISO 7027-2:2019(E)
3.2
turbidity
reduction of transparency of a liquid caused by the presence of undissolved and/or colloidal matter and
small organi
...
SLOVENSKI STANDARD
oSIST prEN ISO 7027-2:2018
01-februar-2018
Kakovost vode - Ugotavljanje motnosti - 2. del: Semikvantitativne metode za
ocenjevanje prosojnosti vode (ISO/DIS 7027-2:2017)
Water quality - Determination of turbidity - Part 2: Semi-quantitative methods for the
assessment of transparency of waters (ISO/DIS 7027-2:2017)
Wasserbeschaffenheit - Bestimmung der Trübung - Teil 2: Semi-quantitative Verfahren
(ISO/DIS 7027-2:2017)
Qualité de l'eau - Détermination de la turbidité - Partie 2: Méthodes semi-quantitatives
pour l'évaluation de la transparence des eaux (ISO/DIS 7027-2:2017)
Ta slovenski standard je istoveten z: prEN ISO 7027-2
ICS:
13.060.60 Preiskava fizikalnih lastnosti Examination of physical
vode properties of water
oSIST prEN ISO 7027-2:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 7027-2:2018
---------------------- Page: 2 ----------------------
oSIST prEN ISO 7027-2:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 7027-2
ISO/TC 147/SC 2 Secretariat: DIN
Voting begins on: Voting terminates on:
2017-12-20 2018-03-14
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
ICS: 13.060.60
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 7027-2:2017(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2017
---------------------- Page: 3 ----------------------
oSIST prEN ISO 7027-2:2018
ISO/DIS 7027-2:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 7027-2:2018
ISO/DIS 7027-2:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Laboratory . 2
4.1 Measurement using the transparency testing tube . 2
4.1.1 Apparatus . 2
4.1.2 Sampling and samples. 2
4.1.3 Procedure . 2
4.1.4 Expression of results . 2
5 In-situ-methods (field methods) . 3
5.1 Measurement using the transparency testing disc . 3
5.1.1 Apparatus . 3
5.1.2 Procedure . 4
5.1.3 Expression of results . 4
5.2 Determination of visibility by divers . 5
5.2.1 Apparatus . 5
5.2.2 Procedure . 5
5.2.3 Expression of results . 5
6 Test report . 6
Annex A (informative) Devices . 7
Annex B (informative) Results of a field study for validation of ISO 7027-2 .9
Bibliography .11
© ISO 2017 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 7027-2:2018
ISO/DIS 7027-2:2017(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
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.
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).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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.
This first edition of ISO 7027-2, together with ISO 7027-1, 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 2017 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 7027-2:2018
ISO/DIS 7027-2:2017(E)
Introduction
The turbidity in waters is caused by finely distributed undissolved and/or colloidal dissolved inorganic
and organic substances as well as by particles (e.g. sediment) and small organisms (bacteria, phyto- and
zooplankton) present in the water. Turbidity changes the lighting conditions in surface waters and thus
influences the trophic status of these waters. For the indicative assessment of the lighting conditions of
[2]
waters or the transparency of the water, semi-quantitative methods can be used (Reference ).
Measurements of transparency can be affected by the presence of dissolved light-absorbing substances
(substances imparting colour) as well as by particles (such as sediments).
In semi-quantitative methods such as the determination of transparency depth by Secchi disc,
reflections on the water surface can cause interferences. These are often dependent on the light and
wind conditions.
© ISO 2017 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 7027-2:2018
---------------------- Page: 8 ----------------------
oSIST prEN ISO 7027-2:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 7027-2:2017(E)
Water quality — Determination of turbidity —
Part 2:
Semi-quantitative methods for the assessment of
transparency of waters
WARNING — Working in or around water is inherently dangerous. Persons using this document
should be familiar with normal laboratory practice. This document does not purport to address
all of the safety problems, if any, associated with its use. It is the responsibility of the user to
establish appropriate safety and health practices.
IMPORTANT — It is absolutely essential that tests conducted in accordance with this document
be carried out by suitably qualified staff.
1 Scope
This document specifies the following semi-quantitative methods for the assessment of transparency
of waters:
a) measurement of visual range using the transparency testing tube (applicable to transparent and
slightly cloudy water); see Clause 4.
b) measurement of visual range in the upper water layers using the transparency testing disc
(especially applicable to surface, bathing water, waste water and often used in marine monitoring);
see 5.1.
c) measurement of visibility by divers in a destined depth, see 5.2.
NOTE The quantitative methods using optical turbidimeters or nephelometers are described in part 1 of
ISO 7027.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including amendments) applies.
ISO 5667-3:2012, Water quality — Sampling — Part 3: Preservation and handling of water samples
CIE Publication No. 17: 1987, International Lighting Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in CIE Publication No. 17 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org./obp
— IEC Electropedia: available at http://www.electropedia.org/
© ISO 2017 – All rights reserved 1
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oSIST prEN ISO 7027-2:2018
ISO/DIS 7027-2:2017(E)
3.1
transparency
permeability with respect to electromagnetic waves, here especially of light
3.2
turbidity
reduction of transparency of a liquid caused by the presence of undissolved and/or colloidal matter
4 Laboratory
In cases where measurements cannot be carried out on site, it may be an option to do it in the laboratory
with the approach described in 4.1.
4.1 Measurement using the transparency testing tube
4.1.1 Apparatus
4.1.1.1 Transparency testing tube, consisting of a colourless glass tube 600 mm ± 10 mm long and of
internal diameter 25 mm ± 1 mm, graduated in divisions of 10 mm.
4.1.1.2 Shield, close fitting, to protect the transparency testing tube from lateral light.
4.1.1.3 Print sample, to place under the tube (4.1.1.1), consisting of black print on a white background
(height of characters 3,5 mm; line width 0,35 mm) or a test mark (for example, a black cross on white
paper), provided with the apparatus.
4.1.1.4 Constant light source, low voltage tungsten lamp (3 W), to illuminate the print sample or test
mark (4.1.1.3).
4.1.2 Sampling and samples
All sample bottles have to be clean. If necessary, wash bottles before use with hydrochloric acid (e.g.
1 mol/l) or a surfactant cleaning solution.
Collect samples in glass or plastic bottles, and carry out the determinations as soon as possible after
collection. If storage is unavoidable, store the samples in a cool, dark
...
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