EN ISO 22125-1:2019

Water quality - Technetium-99 - Part 1: Test method using liquid scintillation counting (ISO 22125-1:2019)

This document specifies a method for the measurement of 99Tc in all types of waters by liquid scintillation counting (LSC).
The method is applicable to test samples of supply/drinking water, rainwater, surface and ground water, as well as cooling water, industrial water, domestic, and industrial wastewater after proper sampling and handling, and test sample preparation. A filtration of the test sample is necessary.
The detection limit depends on the sample volume and the instrument used. The method described in this document, using currently available LSC instruments, has a detection limit of approximately 5 Bq·kg−1 to 20 Bq·kg−1, which is lower than the WHO criteria for safe consumption of drinking water (100 Bq l−1)[3]. These values can be achieved with a counting time of 30 min for a sample volume varying between 14 ml to 40 ml. The method presented in this document is not intended for the determination of ultra-trace amount of 99Tc.
The activity concentration values in this document are expressed by sample mass unit instead of sample volume unit as it is usually the case in similar standards. The reason is that 99Tc is measured in various matrix types such as fresh water or sea water, which have significant differences in density. The activity concentration values can be easily converted to sample volume unit by measuring the sample volume. However, it increases the uncertainty on the activity concentration result.
The method described in this document is applicable in the event of an emergency situation, but not if 99mTc is present at quantities that could cause interference and not if 99mTc is used as a recovery tracer.
The analysis of Tc adsorbed to suspended matter is not covered by this method.
It is the user's responsibility to ensure the validity of this test method for the water samples tested.

Wasserbeschaffenheit - Technetium-99 - Teil 1: Verfahren mit dem Flüssigszintillationszähler (ISO 22125-1:2019)

Dieses Dokument legt ein Verfahren zur Messung von 99Tc in allen Wasserarten durch Flüssigszintillations-zählung (LSC, en: liquid scintillation counting) fest.
Das Verfahren ist auf Untersuchungsproben von Versorgungs-/Trinkwasser, Regenwasser, Oberflächen- und Grundwasser sowie Kühlwasser, Prozesswasser, häusliches und gewerbliches Abwasser nach geeigneter Probenahme, Probenbehandlung und Vorbereitung der Untersuchungsprobe anwendbar. Es ist eine Filtration der Untersuchungsprobe notwendig.
Die Nachweisgrenze hängt vom Probenvolumen und dem verwendeten Gerät ab. Das in diesem Dokument beschriebene Verfahren hat, bei Verwendung der derzeit verfügbaren Flüssigszintillationszähler, eine Nach¬weisgrenze von etwa 5 Bq · kg−1 bis 20 Bq · kg−1; dies liegt unter den WHO  Kriterien für den sicheren Ver¬zehr von Trinkwasser (100 Bq · l−1) [3]. Diese Werte lassen sich bei einer Messdauer von 30 min bei einem Probenvolumen von 14 ml bis 40 ml erreichen. Das in diesem Dokument beschriebene Verfahren ist nicht für die Bestimmung von 99Tc im Ultraspurenbereich vorgesehen.
In diesem Dokument werden die Aktivitätskonzentrationswerte bezogen auf die Masseneinheit statt auf die Volumeneinheit der Probe ausgedrückt, wie dies üblicherweise in vergleichbaren Normen der Fall ist. Der Grund dafür ist, dass 99Tc in verschiedenen Matrixtypen wie Süßwasser oder Meerwasser gemessen wird, die sich hinsichtlich ihrer Dichte signifikant unterscheiden. Durch Messen des Probenvolumens können die Aktivitätskonzentrationswerte auf einfache Weise auf die Volumeneinheit der Probe bezogen umgerechnet werden. Dies führt allerdings zur Erhöhung der Messunsicherheit des Aktivitätskonzentrations¬ergebnisses.
Das in diesem Dokument beschriebene Verfahren ist bei Notfallsituationen anwendbar; dies gilt allerdings nicht, wenn 99mTc in Mengen vorhanden ist, die eine Interferenz verursachen könnte, und auch nicht, wenn 99mTc als Ausbeutetracer verwendet wird.
Die Analyse von Tc, das an Schwebstoffen adsorbiert ist, wird nicht durch dieses Verfahren abgedeckt.
Es liegt in der Verantwortung des Anwenders, die Validität dieses Prüfverfahrens für die zu prüfenden Wasserproben sicherzustellen.

Qualité de l'eau - Technétium-99 - Partie 1: Méthode d’essai par comptage des scintillations en milieu liquide (ISO 22125-1:2019)

Le présent document spécifie une méthode de mesure du 99TC dans tous les types d'eaux par comptage des scintillations en milieu liquide (CSL).
La méthode est applicable aux échantillons pour essai d'eau de distribution/potable, d'eau pluviale, d'eau de surface et souterraine, ainsi que d'eau de refroidissement, d'eau industrielle, d'eau usée domestique et industrielle après échantillonnage, manipulation de l'échantillon et préparation de l'échantillon pour essai. Il est nécessaire de filtrer l'échantillon pour essai.
La limite de détection dépend du volume d'échantillon et de l'instrument utilisé. La méthode décrite dans le présent document, qui a recours aux instruments CSL actuellement disponibles, a une limite de détection d'environ 5 Bq·kg−1 à 20 Bq·kg−1, ce qui est inférieur aux critères de potabilité de l'eau de l'OMS (100 Bq l−1).[3] Ces valeurs peuvent être obtenues avec une durée de comptage de 30 min pour un volume d'échantillon variant entre 14 ml et 40 ml. La méthode présentée dans le présent document n'est pas applicable à la détermination de la quantité de 99Tc à l'état d'ultra-traces.
Les valeurs d'activité volumique indiquées dans le présent document sont exprimées en masse d'échantillon et non en unité de volume d'échantillon comme c'est habituellement le cas dans des normes similaires. La raison est que 99Tc est mesuré dans différents types de matrices tels que l'eau douce ou l'eau de mer, qui présentent des masses volumiques très différentes. Les valeurs d'activité volumique peuvent être facilement converties en unité de volume d'échantillon en mesurant le volume d'échantillon. Cependant, cela accroît l'incertitude applicable au résultat de l'activité volumique.
La méthode décrite dans le présent document est applicable en cas d'urgence, mais pas si 99mTc est présent à des quantités susceptibles de provoquer des interférences et pas si 99mTc est utilisé comme traceur de rendement.
L'analyse du Tc adsorbé dans la matière en suspension n'est pas couverte par la présente méthode.
Il incombe à l'utilisateur de s'assurer que la méthode d'essai relative aux échantillons d'eau soumis à essai est valide.

Kakovost vode - Tehnecij Tc-99 - 1. del: Preskusna metoda s štetjem s tekočinskim scintilatorjem (ISO 22125-1:2019)

Ta standard določa metodo za merjenje tehnecija 99Tc v vseh vrstah vode s štetjem s tekočinskim scintilatorjem (LSC). Meja zaznavanja je odvisna od količine vzorca in uporabljenega instrumenta. Metoda, opisana v tem standardu, s trenutno razpoložljivimi tekočinskimi scintilatorji ima mejo zaznavnosti približno 5–20 Bq•kg-1, ki je nižja od meril Svetovne zdravstvene organizacije za varno porabo pitne vode (100 Bq•l-1). Te vrednosti je mogoče doseči v času štetja 30 min za količino vzorca od 14 do 40 ml. Metode, predstavljene v tem standardu, niso namenjene določanju količine ultra-sledov tehnecija 99Tc.

General Information

• Status: Published
• Publication Date: 26-Nov-2019
• Withdrawal Date: 30-May-2020
• ICS: 13.060.60 - Examination of physical properties of water
• ICS: 17.240 - Radiation measurements
• Technical Committee: CEN/TC 230 - Water analysis
• Drafting Committee: CEN/TC 230 - Water analysis
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 27-Nov-2019
• Completion Date: 27-Nov-2019
• Ref Project: SIST EN ISO 22125-1:2020 - Water quality - Technetium-99 - Part 1: Test method using liquid scintillation counting (ISO 22125-1:2019)

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2020
Kakovost vode - Tehnecij Tc-99 - 1. del: Preskusna metoda s štetjem s
tekočinskim scintilatorjem (ISO 22125-1:2019)
Water quality - Technetium-99 - Part 1: Test method using liquid scintillation counting
(ISO 22125-1:2019)
Wasserbeschaffenheit - Technetium-99 - Teil 1: Verfahren mit dem
Flüssigszintillationszähler (ISO 22125-1:2019)
Qualité de l'eau - Technétium-99 - Partie 1: Méthode d’essai par comptage des
scintillations en milieu liquide (ISO 22125-1:2019)
Ta slovenski standard je istoveten z: EN ISO 22125-1:2019
ICS:
13.060.50 Preiskava vode na kemične Examination of water for
snovi chemical substances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 22125-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2019
EUROPÄISCHE NORM
ICS 13.060.60; 17.240
English Version
Water quality - Technetium-99 - Part 1: Test method using
liquid scintillation counting (ISO 22125-1:2019)
Qualité de l'eau - Technétium-99 - Partie 1: Méthode Wasserbeschaffenheit - Technetium-99 - Teil 1:
d'essai par comptage des scintillations en milieu Verfahren mit dem Flüssigszintillationszähler (ISO
liquide (ISO 22125-1:2019) 22125-1:2019)
This European Standard was approved by CEN on 8 September 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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 22125-1:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 22125-1:2019) 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 May 2020, and conflicting national standards shall be
withdrawn at the latest by May 2020.
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.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 22125-1:2019 has been approved by CEN as EN ISO 22125-1:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 22125-1
First edition
2019-11
Water quality — Technetium-99 —
Part 1:
Test method using liquid scintillation
counting
Qualité de l'eau — Technétium-99 —
Partie 1: Méthode d’essai par comptage des scintillations en milieu
liquide
Reference number
ISO 22125-1:2019(E)
©
ISO 2019
ISO 22125-1:2019(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 22125-1:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 2
4 Principle . 3
5 Sampling and storage . 4
6 Procedure. 4
6.1 Sample preparation for measurement . 4
6.2 Sample measurement . 5
7 Quality assurance and quality control program . 5
7.1 General . 5
7.2 Variables that could influence the measurement . . 5
7.3 Instrument verification. 5
7.4 Contamination . 5
7.5 Interference control . 5
7.6 Method verification . 5
7.7 Demonstration of analyst capability . 6
7.8 Sample measurement . 6
8 Expression of results . 6
8.1 Sample activity, recovery and uncertainties . 6
8.2 Decision threshold . 8
8.3 Detection limit . 9
8.4 Confidence interval limits. 9
8.5 Calculation using the activity per unit of volume . 9
8.6 Conversion of activity concentration to mass concentration .10
8.7 Conversion of mass concentration to volume unit .10
9 Test report .10
Annex A (informative) Method 1 — TEVA resin .12
Annex B (informative) Method 2 — TRU resin .15
Annex C (informative) Method 3 — Anion exchange resin .18
Bibliography .20
ISO 22125-1:2019(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
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Attention is drawn to the possibility that some of the elements of this document may be the subject of
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This document was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 3,
Radioactivity measurements.
A list of all the parts in the ISO 22125 series can be found on the ISO website.
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.
iv © ISO 2019 – All rights reserved

ISO 22125-1:2019(E)
Introduction
Radioactivity from several naturally-occurring and anthropoge
...