Water quality - Technetium-99 - Part 2: Test method using inductively coupled plasma mass spectrometry (ICP-MS) (ISO 22125-2:2019)

This document specifies a method for the measurement of 99Tc in all types of water by inductively coupled plasma mass spectrometry (ICP-MS).
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 ICP-MS, has a detection limit of approximately 0,2 ng·kg−1 to 0,5 ng·kg−1 (0,1 Bq·kg−1 to 0,3 Bq·kg−1), which is much lower than the WHO criteria for safe consumption of drinking water (100 Bq·l−1)[3]. The method presented in this document is not intended for the determination of ultra-trace amount of 99Tc.
The mass 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 mass concentration values can be easily converted to sample volume unit by measuring the sample volume. However, it increases the uncertainty on the mass 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.
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 2: Verfahrens mittels Massenspektronomie und induktiv gekoppeltem Plasma (ICP-MS) (ISO 22125-2:2019)

Dieses Dokument legt ein Verfahren zur Messung von 99Tc in allen Wasserarten durch induktiv gekoppelte Plasma-Atom-Emissionsspektrometrie (en: inductively coupled plasma mass spectrometry; ICP MS) 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 derzeit verfügbarer ICP MS Geräte, eine Nachweisgrenze von etwa 0,2 ng · kg−1 bis 0,5 ng · kg−1 (entsprechend 0,1 Bq · kg−1 bis 0,3 Bq · kg−1); dies liegt unter den WHO Kriterien für den sicheren Verzehr von Trinkwasser (100 Bq · l−1) [3]. Das in diesem Dokumente beschriebene Verfahren ist nicht für die Bestimmung von 99Tc im Ultraspurenbereich vorgesehen.
In diesem Dokument werden die Massenkonzentrationswerte bezogen auf die Masseneinheit statt auf die Volumeneinheit der Probe ausgedrückt, wie dies üblicherweise bei vergleichbaren Standards der Fall ist. Der Grund dafür ist, dass 99Tc in verschiedenen Matrixtypen wie Süßwasser oder Meerwasser gemessen wird, die hinsichtlich der Dichte signifikant unterschiedlich sind. Durch Messen des Probenvolumens können die Massenkonzentrationswerte auf einfache Weise auf die Volumeneinheit der Probe bezogen umgerechnet werden. Dies führt allerdings zur Erhöhung der Messunsicherheit des Massenkonzentrationsergebnisses.
Das in diesem Dokument beschriebene Verfahren ist bei Notfallsituationen anwendbar; dies gilt jedoch nicht, wenn 99mTc in Mengen vorhanden ist, die eine Interferenz verursachen könnten.
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 2: Méthode d’essai par spectrométrie de masse couplée à un plasma induit (ISO 22125-2:2019)

Le présent document spécifie une méthode de mesure de 99Tc dans tous les types d'eau par spectrométrie de masse couplée à un plasma induit (ICP-MS).
Cette 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 spectromètres ICP-MS actuellement disponibles, a une limite de détection d'environ 0,2 ng·kg−1 à 0,5 ng·kg−1 (0,1 Bq·kg−1 à 0,3 Bq·kg−1), ce qui est nettement inférieur aux critères de potabilité de l'eau de l'OMS (100 Bq·l−1).[3] 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 de concentration en masse indiquées dans le présent document sont exprimées en unité de masse d'échantillon, et non en unité de volume d'échantillon comme c'est habituellement le cas dans les normes similaires. Cela tient au fait 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 de concentration en masse 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 la concentration en masse.
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.
L'analyse de 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 - 2. del: Preskusna metoda z masno spektrometrijo z induktivno sklopljeno plazmo (ICP-MS) (ISO 22125-2:2019)

Ta standard določa metodo za merjenje tehnecija 99Tc v vseh vrstah vode z masno spektrometrijo z induktivno sklopljeno plazmo (ICP-MS).
Metoda, opisana v tem standardu, s trenutno razpoložljivo masno spektrometrijo ima mejo zaznavnosti približno 0,2–0,5 ng•l-1 (0,1–0,3 Bq•kg-1), ki je precej nižja od meril organizacije WHO za varno porabo pitne vode (100 Bq•l-1). Metoda, predstavljena v tem standardu, ni namenjena določanju količine ultra-sledov tehnecija 99Tc.

General Information

Status
Published
Publication Date
26-Nov-2019
Technical Committee
Drafting Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
27-Nov-2019
Completion Date
27-Nov-2019

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SLOVENSKI STANDARD
SIST EN ISO 22125-2:2020
01-februar-2020
Kakovost vode - Tehnecij Tc-99 - 2. del: Preskusna metoda z masno
spektrometrijo z induktivno sklopljeno plazmo (ICP-MS) (ISO 22125-2:2019)

Water quality - Technetium-99 - Part 2: Test method using inductively coupled plasma

mass spectrometry (ICP-MS) (ISO 22125-2:2019)

Wasserbeschaffenheit - Technetium 99 - Teil 2: Verfahrens mittels Massenspektronomie

und induktiv gekoppeltem Plasma (ICP-MS) (ISO 22125-2:2019)

Qualité de l'eau - Technétium-99 - Partie 2: Méthode d’essai par spectrométrie de masse

couplée à un plasma induit (ISO 22125-2:2019)
Ta slovenski standard je istoveten z: EN ISO 22125-2:2019
ICS:
13.060.50 Preiskava vode na kemične Examination of water for
snovi chemical substances
SIST EN ISO 22125-2:2020 en,fr,de

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

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SIST EN ISO 22125-2:2020
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SIST EN ISO 22125-2:2020
EN ISO 22125-2
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2019
EUROPÄISCHE NORM
ICS 13.060.60; 17.240
English Version
Water quality - Technetium-99 - Part 2: Test method using
inductively coupled plasma mass spectrometry (ICP-MS)
(ISO 22125-2:2019)

Qualité de l'eau - Technétium-99 - Partie 2: Méthode Wasserbeschaffenheit - Technetium 99 - Teil 2:

d'essai par spectrométrie de masse couplée à un Verfahrens mittels Massenspektronomie und induktiv

plasma induit (ISO 22125-2:2019) gekoppeltem Plasma (ICP-MS) (ISO 22125-2:2019)
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 22125-2:2019 E

worldwide for CEN national Members.
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SIST EN ISO 22125-2:2020
EN ISO 22125-2:2019 (E)
Contents Page

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

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SIST EN ISO 22125-2:2020
EN ISO 22125-2:2019 (E)
European foreword

This document (EN ISO 22125-2:2019) 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 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 22125-2:2019 has been approved by CEN as EN ISO 22125-2:2019 without any

modification.
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SIST EN ISO 22125-2:2020
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SIST EN ISO 22125-2:2020
INTERNATIONAL ISO
STANDARD 22125-2
First edition
2019-11
Water quality — Technetium-99 —
Part 2:
Test method using inductively coupled
plasma mass spectrometry (ICP-MS)
Qualité de l'eau — Technétium-99 —
Partie 2: Méthode d’essai par spectrométrie de masse couplée à un
plasma induit (ICP-MS)
Reference number
ISO 22125-2:2019(E)
ISO 2019
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SIST EN ISO 22125-2:2020
ISO 22125-2:2019(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
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SIST EN ISO 22125-2:2020
ISO 22125-2:2019(E)
Contents Page

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

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

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

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

3 Terms, definitions and symbols ............................................................................................................................................................ 2

4 Principle ........................................................................................................................................................................................................................ 4

5 Sampling, handling 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 ............................................................................................................................................................................ 6

7.6 Method verification ............................................................................................................................................................................. 6

7.7 Demonstration of analyst capability .................................................................................................................................... 6

8 Expression of results ........................................................................................................................................................................................ 6

97 98

8.1 Using Re, Tc, or Tc as a recovery tracer .................................................................................................................... 6

8.1.1 Calculation of mass of tracer and analyte added.................................................................................. 6

8.1.2 Measurement bias .......................................................................................................................................................... 7

8.1.3 Sample mass concentration ................................................................................................................................... 7

8.1.4 Detection limit ................................................................................................................................................................... 8

8.1.5 Limit of quantification ................................................................................................................................................ 8

95m 97m 99m

8.2 Using Tc, Tc or Tc as a recovery tracer ...................................................................................................... 8

8.2.1 Calculation of activity of tracer, mass of analyte and mass of internal

standard added ................................................................................................................................................................. 8

8.2.2 Purification step recovery ........................................................................................................................................ 9

8.2.3 Measurement bias .......................................................................................................................................................... 9

8.2.4 Sample mass concentration ................................................................................................................................... 9

8.2.5 Detection limit ................................................................................................................................................................... 9

8.2.6 Limit of quantification .............................................................................................................................................10

8.2.7 Conversion of mass concentration to activity concentration .................................................10

8.2.8 Conversion of mass concentration to volume unit ..........................................................................10

8.3 Correction for the presence of Tc in the tracer ......... ...........................................................................................11

9 Test report ................................................................................................................................................................................................................11

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 .............................................................................................................................................................................................................................21

© ISO 2019 – All rights reserved iii
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SIST EN ISO 22125-2:2020
ISO 22125-2:2019(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 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
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SIST EN ISO 22125-2:2020
ISO 22125-2:2019(E)
Introduction

Radioactivity from several naturally-occurring and anthropogenic sources is present throughout the

environment. Thus, water bodies (such as surface waters, ground waters, sea waters) can contain

radionuclides of natural, human-made, or both origin.
40 3 14

— Natural radionuclides, including K, H, C, and those originating from the thorium and uranium

226 228 234 238 210 210

decay series, in particular Ra, Ra, U, U, Po and Pb can be found in water for natural

reasons (such as desorption from the soil and washoff by rain water) or can be released from

technological processes involving naturally occurring radioactive materials (such as the mining

and processing of mineral sands or phosphate fertilizers production and use).

— Human-made radionuclides such as transuranium elements (americium, plutonium, neptunium,

3 14 90

curium), H, C, Sr, and gamma emitting radionuclides can also be found in natural waters.

Small quantities of these radionuclides are discharged from nuclear fuel cycle facilities into the

environment as a result of authorized routine releases. Some of these radionuclides used for

medical and industrial applications are also released into the environment after use. Anthropogenic

radionuclides are also found in waters as a result of past fallout contaminations resulting from

the explosion in the atmosphere of nuclear devices and accidents such as those that occurred in

Chernobyl and Fukushima.

Radionuclide activity concentration in water bodies can vary according to local geological

characteristics and climatic conditions and can be locally and temporally enhanced by releases from

[1]

nuclear installation during planned, existing, and emergency exposure situations . Drinking water

may thus contain radionuclides at activity concentrations which could present a risk to human health.

The radionuclides present in liquid effluents are usually controlled before being discharged into

[2]

the environment and water bodies. Drinking waters are monitored for their radioactivity as

[3]

recommended by the World Health Organization (WHO) so that proper actions can be taken to ensure

that there is no adverse health effect to the public. Following these international recommendations,

national regulations usually specify radionuclide authorized concentration limits for liquid effluent

discharged to the environment and radionuclide guidance levels for waterbodies and drinking waters

for planned, existing, and emergency exposure situations. Compliance with these limits can be assessed

using measurement results with their associated uncertainties as specified by ISO/IEC Guide 98-3 and

[4]
ISO 5667-20 .

Depending on the exposure situation, there are different limits and guidance levels that would result in

an action to reduce health risk. As an example, during planned or existing situation, the WHO guidelines

−1 99 [3]
for guidance level in drinking water is 100 Bq·l for Tc activity concentration.

NOTE 1 The guidance level is the activity concentration with an intake of 2 l/d of drinking water for one year

that results in an effective dose of 0,1 mSv/a for members of the public. This is an effective dose that represents a

[3]

very low level of risk and which is not expected to give rise to any detectable adverse health effects .

[5]

In the event of a nuclear emergency, the WHO Codex Guideline Levels mentioned that the activity

−1 99

concentration in contaminated food might not be greater than 10 000 Bq·kg for Tc.

NOTE 2 The Codex guidelines levels (GLs) apply to radionuclides contained in foods destined for human

consumption and traded internationally, which have been contaminated following a nuclear or radiological

emergency. These GLs apply to food after reconstitution or as prepared for consumption, i.e. not to dried or

concentrated foods, and are based on an intervention exemption level of 1 mSv in a year for members of the

[5]
public (infant and adult) .

Thus, the test method can be adapted so that the characteristic limits, decision threshold, detection

limit and uncertainties ensure that the radionuclide activity concentrations test results can be verified

to be below the guidance levels required by a national authority for either planned/existing situations

[5][6][7]
or for an emergency situation .

Usually, the test methods can be adjusted to measure the activity concentration of the radionuclide(s)

in either wastewaters before storage or in liquid effluents before being discharged to the environment.

© ISO 2019 – All rights reserved v
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SIST EN ISO 22125-2:2020
ISO 22125-2:2019(E)

The test results will enable the plant/installation operator to verify that, before their discharge,

wastewaters/liquid effluent radioactive activity concentrations do not exceed authorized limits.

The test method(s) described in this document may be used during planned, existing and emergency

exposure situations as well as for wastewaters and liquid effluents with specific modifications that

could increase the overall uncertainty, detection limit, and threshold.

The test method(s) may be used for water samples after proper sampling, sample handling, and test

sample preparation (see the relevant part of the ISO 5667 series).

This document has been developed to answer the need of test laboratories carrying out these

measurements, that are sometimes required by national authorities, as they may have to obtain a

specific accreditation for radionuclide measurement in drinking water samples.

This document is one of a set of International Standards on test methods dealing with the measurement

of the activity concentration of radionuclides in water samples.
vi © ISO 2019 – All rights reserved
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SIST EN ISO 22125-2:2020
INTERNATIONAL STANDARD ISO 22125-2:2019(E)
Water quality — Technetium-99 —
Part 2:
Test method using inductively coupled plasma mass
spectrometry (ICP-MS)

WARNING — Persons using this document should be familiar with normal laboratory practices.

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 and to

determine the applicability of any other restrictions.

IMPORTANT — It is absolutely essential that tests conducted according to this test method be

carried out by suitably trained staff.
1 Scope

This document specifies a method for the measurement of Tc in all types of water by inductively

coupled plasma mass spectrometry (ICP-MS).

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 ICP-MS, has a detection limit of approximately 0,2 ng·kg to

−1 −1 −1

0,5 ng·kg (0,1 Bq·kg to 0,3 Bq·kg ), which is much lower than the WHO criteria for safe consumption

−1 [3]

of drinking water (100 Bq·l ) . The method presented in this document is not intended for the

determination of ultra-trace amount of Tc.

The mass 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 Tc is measured in various

matrix types such as fresh water or sea water, which have significant differences in density. The mass

concentration values can be easily converted to sample volume unit by measuring the sample volume.

However, it increases the uncertainty on the mass concentration result.

The method described in this document is applicable in the event of an emergency situation, but not if

99m
Tc is present at quantities that could cause interference.
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.

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 any amendments) applies.

ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in

me a s ur ement (GUM: 1995)

ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated

terms (VIM)
© ISO 2019 – All rights reserved 1
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SIST EN ISO 22125-2:2020
ISO 22125-2:2019(E)
ISO 3696, Water for analytical laboratory use — Specification and test methods

ISO 5667-1, Water quality — Sampling — Part 1: Guidance on the design of sampling programmes and

sampling techniques

ISO 5667-3, Water quality — Sampling — Part 3: Preservation and handling of water samples

ISO 5667-10, Water quality — Sampling — Part 10: Guidance on sampling of waste waters

ISO 10703, Water quality — Determination of the activity concentration of radionuclides — Method by

high resolution gamma-ray spectrometry

ISO 11929 (all parts), Determination of the characteristic limits (decision threshold, detection limit and

limits of the confidence interval) for measurements of ionizing radiation — Fundamentals and application

ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories

ISO 17294-2, Water quality — Application of inductively coupled plasma mass spectrometry (ICP-MS) —

Part 2: Determination of selected elements including uranium isotopes

ISO 20042, Measurement of radioactivity — Gamma emitting radionuclides — Generic test method using

gamma spectrometry
ISO 80000-10, Quantities and units — Part 10: Atomic and nuclear physics
3 Terms, definitions and symbols
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 80000-10, ISO 11929,

ISO/IEC Guide 98-3 and ISO/IEC Guide 99 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/
3.2 Symbols

For the purposes of this document, the symbols and designations given in ISO 80000-10, ISO 11929,

ISO/IEC Guide 98-3, ISO/IEC Guide 99 and the following apply.
Symbol Term Unit Definition
symbol
α Measurement bias — α is a constant which allows to correct for the signal
intensity bias between the tracer or the internal standard
and the analyte

C Activity concentration Bq·kg Corresponding to the activity concentration ρ measured for

a given radionuclide
C Specific activity Bq∙g Activity corresponding to one gram of the radionuclide

DL Detection limit in mass g∙kg DL is the lowest mass concentration that can be considered

concentration statistically different from a blank sample.

DL Detection limit in activity Bq∙kg DL is the lowest activity concentration that can be

concentration considered statistically different from a blank sample.

LOQ Limit of quantification in g∙kg LOQ is the lowest mass concentration that can be quantified

mass concentration with statistically certainty
2 © ISO 2019 – All rights reserved
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SIST EN ISO 22125-2:2020
ISO 22125-2:2019(E)
Symbol Term Unit Definition
symbol

LOQ Limit of quantification in Bq∙kg LOQ is the lowest activity concentration that can be

activity concentration quantified with statistically certainty
m Sample mass kg Mass of the water sample
m/z Mass on charge ratio — Mass on charge ratio measured by the ICP-MS
m Analyte mass g Mass of analyte added to a spiked solution

m Analyte solution mass g Mass of the analyte solution added to a control sample or for

measurement calculation

m Internal standard mass g Mass of the internal standard added to the blank and sample

m Internal standard solution g Mass of the internal standard solution added to a blank

ISS
mass sample or a sample
m Tracer mass g Mass of the tracer added to the blank and sample
m Reagent blank tracer mass g Mass of tracer added to the reagent blank for the
calculation of N
net

m Tracer solution mass g Mass of the tracer solution added to a blank sample or a

sample
N Counts counts Number of counts directly obtained when performing
the ICP-MS measurement for a sample at a given mass on
charge ratio
N Counts of the blank counts Number of counts directly obtained when performing
the ICP-MS measurement for a blank at a given mass on
charge ratio
Average counts of blank counts Average number of counts directly obtained when
N samples performing the ICP-MS measurement for several blanks at a
given mass on charge ratio
N Net counts counts N-N
net 0
N Net counts of the internal counts At the internal standard mass
netIS
standard
N Net counts of the tracer counts At the tracer mass
netT

N spiked reagent blank count counts spiked reagent blank count rate for N calculation

sp net
99 99
N Tc counts from the tracer counts Tc present in the tracer as impurities
N Unspiked reagent blank counts Unspiked
...

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