Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016)

ISO 7027-1:2016 specifies two quantitative methods using optical turbidimeters or nephelometers for the determination of turbidity of water:
a)    nephelometry, procedure for measurement of diffuse radiation, applicable to water of low turbidity (for example drinking water);
b)    turbidimetry, procedure for measurement of the attenuation of a radiant flux, more applicable to highly turbid waters (for example waste waters or other cloudy waters).
Turbidities measured according to the first method are presented as nephelometric turbidity units (NTU). The results typically range between <0,05 NTU and 400 NTU. Depending on the instrument design, it can also be applicable to waters of higher turbidity. There is numerical equivalence of the units NTU and formazin nephelometric unit (FNU).
Turbidity measured by the second method is expressed in formazin attenuation units (FAU), results typically range between 40 FAU and 4 000 FAU.

Wasserbeschaffenheit - Bestimmung der Trübung - Teil 1: Quantitative Verfahren (ISO 7027-1:2016)

Dieser Teil von ISO 7027 legt zwei quantitative Verfahren unter Verwendung von optischen Trübungsmessgeräten oder Nephelometern zur Bestimmung der Trübung von Wasser fest:
a)   Nephelometrie: Verfahren zur Messung der an Partikeln gestreuten Strahlung (Streustrahlung), anwendbar auf Wasser mit geringer Trübung (z. B. Trinkwasser);
b)   Turbidimetrie: Verfahren zur Messung der Schwächung der durchgehenden Strahlung. Sie sind besser geeignet für stark trübe Wässer (z. B. Abwässer oder schwebstoffhaltige Wässer).
Nach dem ersten Verfahren gemessene Trübungen werden in nephelometrischen Trübungs-Einheiten (NTU, en: nephelometric turbidity unit) angegeben. Ergebnisse liegen typischerweise zwischen < 0,05 NTU und 400 NTU. In Abhängigkeit vom Geräteaufbau können auch stärker getrübte Wässer gemessen werden. Es besteht eine zahlenmäßige Gleichheit der Einheiten NTU und Formazin-nephelometrische Einheit (FNU, en: formazine nephelometric units).
Nach dem zweiten Verfahren gemessene Trübungen werden in Formazin-Schwächungseinheiten (FAU, en: formazin attenuation units) angegeben; die Ergebnisse liegen typischerweise zwischen 40 FAU und 4 000 FAU.

Qualité de l'eau - Détermination de la turbidité - Partie 1: Méthodes quantitatives (ISO 7027-1:2016)

L'ISO 7027-1 :2016 prescrit deux méthodes quantitatives de détermination de la turbidité de l'eau, à l'aide de turbidimètres ou de néphélomètres optiques:
a)    la néphélométrie, qui est une méthode par mesurage du rayonnement diffus, applicable aux eaux de faible turbidité (par exemple, les eaux de boisson);
b)    la turbidimétrie, qui est une méthode par mesurage de l'atténuation du rayonnement, plus appropriée aux eaux de forte turbidité (par exemple, eaux résiduaires ou autres eaux troubles);
Les turbidités mesurées suivant la première méthode sont exprimées en unités de turbidité néphélométriques (NTU). Elles sont généralement comprises entre 0,05 NTU et 400 NTU. Selon les caractéristiques de l'appareillage, cette méthode peut être également utilisée pour des eaux de plus forte turbidité. Il existe une équivalence numérique entre les unités de turbidité néphélométriques (NTU) et les unités néphélométriques formazine (FNU).
La turbidité mesurée selon la seconde méthode est exprimée en unités d'atténuation formazine (FAU), elle est généralement comprise entre 40 FAU et 4000 FAU.

Kakovost vode - Ugotavljanje motnosti - 1. del: Kvantitativne metode (ISO 7027-1:2016)

Ta del standarda ISO 7027 določa dve kvantitativni metodi za ugotavljanje motnosti vode z uporabo optičnih turbidimetrov ali nefelometrov:
a) nefelometrija, postopek za merjenje razpršenega sevanja, ki se uporablja za vodo z nizko motnostjo (npr. pitno vodo);
b) turbidimetrija, postopek za merjenje slabljenja toka sevanja, ki se pogosteje uporablja za vode z visoko motnostjo (npr. odpadne vode ali druge motne vode).
Motnosti, izmerjene s prvo metodo, so predstavljene kot nefelometrične enote motnosti
(NTU). Rezultati se običajno gibljejo med < 0,05 in 400 NTU. Glede na zasnovo instrumenta
se lahko uporabljajo tudi za vode z visoko motnostjo. Nefelometrične enote motnosti (NTU)
in formazinske nefelometrične enote (FNU) so številsko enakovredne.
Motnost, izmerjena z drugo metodo, je izražena v enotah FAU (Formazin Attenuation Units). Rezultati
se običajno gibljejo med 40 in 4000 FAU.

General Information

Status
Published
Publication Date
28-Jun-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
29-Jun-2016
Completion Date
29-Jun-2016

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SLOVENSKI STANDARD
SIST EN ISO 7027-1:2017
01-april-2017
1DGRPHãþD
SIST EN ISO 7027:2000
Kakovost vode - Ugotavljanje motnosti - 1. del: Kvantitativne metode (ISO 7027-
1:2016)

Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-

1:2016)

Wasserbeschaffenheit - Bestimmung der Trübung - Teil 1: Quantitative Verfahren (ISO

7027-1:2016)

Qualité de l'eau - Détermination de la turbidité - Partie 1: Méthodes quantitatives (ISO

7027-1:2016)
Ta slovenski standard je istoveten z: EN ISO 7027-1:2016
ICS:
13.060.60 Preiskava fizikalnih lastnosti Examination of physical
vode properties of water
SIST EN ISO 7027-1:2017 en,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 7027-1:2017
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SIST EN ISO 7027-1:2017
EN ISO 7027-1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2016
EUROPÄISCHE NORM
ICS 13.060.60 Supersedes EN ISO 7027:1999
English Version
Water quality - Determination of turbidity - Part 1:
Quantitative methods (ISO 7027-1:2016)

Qualité de l'eau - Détermination de la turbidité - Partie Wasserbeschaffenheit - Bestimmung der Trübung - Teil

1: Méthodes quantitatives (ISO 7027-1:2016) 1: Quantitative Verfahren (ISO 7027-1:2016)

This European Standard was approved by CEN on 15 April 2016.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
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CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7027-1:2016 E

worldwide for CEN national Members.
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SIST EN ISO 7027-1:2017
EN ISO 7027-1:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 7027-1:2017
EN ISO 7027-1:2016 (E)
European foreword

This document (EN ISO 7027-1:2016) 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 December 2016, and conflicting national standards

shall be withdrawn at the latest by December 2016.
This document supersedes EN ISO 7027:1999.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 7027-1:2016 has been approved by CEN as EN ISO 7027-1:2016 without any

modification.
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SIST EN ISO 7027-1:2017
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SIST EN ISO 7027-1:2017
INTERNATIONAL ISO
STANDARD 7027-1
First edition
2016-06-15
Water quality — Determination of
turbidity —
Part 1:
Quantitative methods
Qualité de l’eau — Détermination de la turbidité —
Partie 1: Méthodes quantitatives
Reference number
ISO 7027-1:2016(E)
ISO 2016
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SIST EN ISO 7027-1:2017
ISO 7027-1:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, 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

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copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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SIST EN ISO 7027-1:2017
ISO 7027-1:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Sampling and samples .................................................................................................................................................................................... 2

5 Quantitative methods of turbidity measurement using optical nephelometers

and turbidimeters ............................................................................................................................................................................................... 2

5.1 General principles ................................................................................................................................................................................ 2

5.2 Reagents........................................................................................................................................................................................................ 3

5.3 Measurement of diffuse radiation (nephelometry) ................................................................................................ 5

5.3.1 Apparatus ............................................................................................................................................................................... 5

5.3.2 Calibration ............................................................................................................................................................................. 5

5.3.3 Procedure ............................................................................................................................................................................... 5

5.3.4 Expression of results .................................................................................................................................................... 5

5.3.5 Test report ............................................................................................................................................................................. 5

5.4 Measurement of attenuated radiation (turbidimetry) ......................................................................................... 5

5.4.1 Apparatus ............................................................................................................................................................................... 5

5.4.2 Calibration ............................................................................................................................................................................. 6

5.4.3 Procedure ............................................................................................................................................................................... 6

5.4.4 Expression of results .................................................................................................................................................... 6

5.4.5 Test report ............................................................................................................................................................................. 6

Annex A (informative) Results of an interlaboratory collaborative trial to evaluate the

suitability of a synthetic polymer for use as a secondary standard to formazin in

turbidity measurements .............................................................................................................................................................................. 7

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2016 – All rights reserved iii
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SIST EN ISO 7027-1:2017
ISO 7027-1:2016(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 WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 147, Water quality, Subcommittee SC 2, Physical,

chemical and biochemical methods.

This first edition of ISO 7027-1, together with ISO 7027-2, cancels and replaces ISO 7027:1999, which

has been technically revised.

ISO 7027 consists of the following parts, under the general title Water quality — Determination of

turbidity:
— Part 1: Quantitative methods
The following part is under preparation:
— Part 2: Semi-quantitative methods
iv © ISO 2016 – All rights reserved
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SIST EN ISO 7027-1:2017
ISO 7027-1:2016(E)
Introduction

Measurements of turbidity can be affected by the presence of dissolved light-absorbing substances

(substances imparting colour). Such effects can be minimized, however, by performing measurements

at wavelengths greater than 800 nm. Only carbon black and a blue colour, which can be found in certain

polluted waters, slightly affects measurements of turbidity in this region of the spectrum. Air bubbles

can also interfere with measurements, but such interference can be minimized by careful handling of

the samples.

It is to be investigated whether and to what extent, particular problems will require the specification of

additional marginal conditions.
© ISO 2016 – All rights reserved v
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SIST EN ISO 7027-1:2017
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SIST EN ISO 7027-1:2017
INTERNATIONAL STANDARD ISO 7027-1:2016(E)
Water quality — Determination of turbidity —
Part 1:
Quantitative methods

WARNING — Persons using this International Standard should be familiar with normal

laboratory practice. This International Standard 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 and to ensure compliance with any national regulatory

conditions.

IMPORTANT — It is absolutely essential that tests conducted in accordance with this

International Standard be carried out by suitably qualified staff.
1 Scope

This part of ISO 7027 specifies two quantitative methods using optical turbidimeters or nephelometers

for the determination of turbidity of water:

a) nephelometry, procedure for measurement of diffuse radiation, applicable to water of low turbidity

(for example drinking water);

b) turbidimetry, procedure for measurement of the attenuation of a radiant flux, more applicable to

highly turbid waters (for example waste waters or other cloudy waters).

Turbidities measured according to the first method are presented as nephelometric turbidity units

(NTU). The results typically range between <0,05 NTU and 400 NTU. Depending on the instrument

design, it can also be applicable to waters of higher turbidity. There is numerical equivalence of the

units NTU and formazin nephelometric unit (FNU).

Turbidity measured by the second method is expressed in formazin attenuation units (FAU), results

typically range between 40 FAU and 4 000 FAU.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

CIE Publication No. 17, 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.
3.1
turbidity

reduction of transparency of a liquid caused by the presence of undissolved matter

© ISO 2016 – All rights reserved 1
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SIST EN ISO 7027-1:2017
ISO 7027-1:2016(E)
4 Sampling and samples

Maintain all containers that come into contact with the sample in a scrupulously clean con

...

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