EN ISO 10101-3:2022

SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN ISO 10101-3:2000
Zemeljski plin - Določevanje vode po Karl-Fischerjevi metodi - 3. del:
Kulometrijska metoda (ISO 10101-3:2022)
Natural gas - Determination of water by the Karl Fischer method - Part 3: Coulometric
procedure (ISO 10101-3:2022)
Erdgas - Bestimmung des Wassergehaltes nach Karl Fischer - Teil 3: Coulometrisches
Verfahren (ISO 10101-3:2022)
Gaz naturel - Dosage de l'eau par la méthode de Karl Fischer - Partie 3: Méthode
coulométrique (ISO 10101-3:2022)
Ta slovenski standard je istoveten z: EN ISO 10101-3:2022
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10101-3
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 75.060 Supersedes EN ISO 10101-3:1998
English Version
Natural gas - Determination of water by the Karl Fischer
method - Part 3: Coulometric procedure (ISO 10101-
3:2022)
Gaz naturel - Dosage de l'eau par la méthode de Karl Erdgas - Bestimmung des Wassergehaltes nach Karl
Fischer - Partie 3: Méthode coulométrique (ISO 10101- Fischer - Teil 3: Coulometrisches Verfahren (ISO
3:2022) 10101-3:2022)
This European Standard was approved by CEN on 26 August 2022.

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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10101-3:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10101-3:2022) has been prepared by Technical Committee ISO/TC 193
"Natural gas" in collaboration with Technical Committee CEN/TC 238 “Test gases, test pressures,
appliance categories and gas appliance types” the secretariat of which is held by AFNOR.
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 April 2023, and conflicting national standards shall be
withdrawn at the latest by April 2023.
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 10101-3:1998.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 10101-3:2022 has been approved by CEN as EN ISO 10101-3:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 10101-3
Second edition
2022-08
Natural gas — Determination of water
by the Karl Fischer method —
Part 3:
Coulometric procedure
Gaz naturel — Dosage de l'eau par la méthode de Karl Fischer —
Partie 3: Méthode coulométrique
Reference number
ISO 10101-3:2022(E)
ISO 10101-3:2022(E)
© ISO 2022
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 10101-3:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Sampling . 5
8 Procedure .6
8.1 Installation . 6
8.2 Testing the response . 6
8.3 Measurement . 6
8.4 Blank value determination . 6
9 Expression of the results .7
9.1 Method of calculation . 7
9.2 Measurement uncertainty . 7
10 Test report . 8
Bibliography . 9
iii
ISO 10101-3:2022(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 193, Natural Gas, Subcommittee SC 1,
Analysis of natural gas, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 238, Test gases, test pressures, appliance categories and gas appliance types,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 10101-3:1993), which has been technically
revised.
The main changes are as follows:
— Clause 2 and Bibliography were revised;
— new fixed structure numbering inserted;
— Subclause 9.2 Measurement of uncertainty was added.
A list of all parts in the ISO 10101 series can be found on the ISO website.
iv
ISO 10101-3:2022(E)
Introduction
Water vapour may be present in natural gas due to, for example, natural occurrence in the well
production stream, the storage of gas in underground reservoirs, transmission or distribution through
mains containing moisture or other reasons.
The Karl Fischer (KF) titration can be divided into two basic techniques – depending on the application
range – volumetric and coulometric KF titration. The two analysis techniques differ in the mode of
iodine addition or generation. Volumetric KF titration is preferably used for the determination of large
amounts of water in the range of 1 mg to 100 mg. Coulometry, however, is a micro-method which is
particularly well suited for determination of quantities of water from 10 μg to 10 mg.
Modern KF coulometers cover a range from 10 μg to 200 mg of water. Usually a resolution of 0,1 μg of
water is achieved.
In coulometric water determination, iodine is not added in the form of a titrating solution but rather
directly produced from an iodine-containing solution by an anodic oxidation reaction. The high analytic
precision at low absolute water quantities makes coulometric KF titration particularly well suited for
determination of the water content in aqueous gases.
Coulometric KF titration can be subdivided according to two distinct designs of the analysis cell:
Cells with and without diaphragm. In both variants, the measuring cells are made of a titration
vessel tightly sealed to prevent moisture ingress. The sample gas is passed directly through a glass
frit into the KF titration cell.
...