EN ISO 10101-1:2022

SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN ISO 10101-1:2000
Zemeljski plin - Določevanje vode po Karl-Fischerjevi metodi - 1. del: Splošne
zahteve (ISO 10101-1:2022)
Natural gas - Determination of water by the Karl Fischer method - Part 1: General
requirements (ISO 10101-1:2022)
Erdgas - Bestimmung des Wassergehaltes nach Karl Fischer - Teil 1: Einführung (ISO
10101-1:2022)
Gaz naturel - Dosage de l'eau par la méthode de Karl Fischer - Partie 1: Exigences
générales (ISO 10101-1:2022)
Ta slovenski standard je istoveten z: EN ISO 10101-1:2022
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10101-1
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 75.060 Supersedes EN ISO 10101-1:1998
English Version
Natural gas - Determination of water by the Karl Fischer
method - Part 1: General requirements (ISO 10101-
1:2022)
Gaz naturel - Dosage de l'eau par la méthode de Karl Erdgas - Bestimmung des Wassergehaltes nach Karl
Fischer - Partie 1: Exigences générales (ISO 10101- Fischer - Teil 1: Einführung (ISO 10101-1:2022)
1:2022)
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 10101-1:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10101-1:2022) 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 March 2023, and conflicting national standards shall
be withdrawn at the latest by March 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 10101-1:1998.
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 10101-1:2022 has been approved by CEN as EN ISO 10101-1:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 10101-1
Second edition
2022-08
Natural gas — Determination of water
by the Karl Fischer method —
Part 1:
General requirements
Gaz naturel — Dosage de l'eau par la méthode de Karl Fischer —
Partie 1: Exigences générales
Reference number
ISO 10101-1:2022(E)
ISO 10101-1:2022(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
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or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 10101-1:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
4.1 General . 1
4.2 Principle of the titration method . 1
4.3 Principle of the coulometric method . 2
5 Reactions and interferences .2
6 Sampling . 3
7 Measurement uncertainty .3
Bibliography . 4
iii
ISO 10101-1:2022(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 10101-1:1993), which has been technically
revised.
The main changes are as follows:
— Clause 2 and Bibliography were revised;
— New fixed structure numbering inserted.
A list of all parts in the ISO 10101 series can be found on the ISO website.
iv
ISO 10101-1:2022(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 method for the determination of moisture has several practical advantages compared
to other methods for moisture determination, such as accuracy, speed and selectivity.
The Karl Fischer method is selective for water, because the titration reaction itself consumes water.
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.
KF titration is essentially based on the Bunsen reaction used for the determination of sulphur dioxide
in aqueous solution:
22HO++SO IH→+SO HI
22 22 4
If an excess of sulphur dioxide with simultaneous neutralization of the sulphuric acid formed shift the
reaction equilibrium to the right, the Bunsen reaction can also be used for the determination of water.
Karl Fischer used pyridine as (neutralization) base, thus developing the classical KF reagent. This was
[9]
a solution of iodine and sulphur dioxide in a solvent mixture of pyridine and methanol . The fact that
the pyridine contained in the reagent has a strong unpleasant odour and toxicity and the reaction
[9]
runs stoichiometrically only within a certain pH range led to the revision of the KF reagents . Scholz
formulated the following KF reaction based on imidazole:
CH OH+SO+RN→[]RNHSOCH
32 33
where RN = Base.
HO+I +R[]NH SO CH +2RN→[]RNHSOCH+2R[]NH I
22 33 43
Volumetric KF titration is preferably used for the determination of large amounts of water in the range
[10]
of 1 mg to 100 mg . Coulometry, however, is a micro-method which is particularly well suited for
[10]
determination of quantities of water from 10 µg to 10 mg . In coulometric water determination, iodine
is not added in the form of a titrating solution but rather directly produced from a iodine-containing
[9]
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.
v
INTERNATIONAL STANDARD ISO 10101-1:2022(E)
Natural gas — Determination of water by the Karl Fischer
method —
Part 1:
General requirements
1 Scope
This document specifies general requirements for the determination of water in natural gas using the
Karl Fischer method (see Reference [1]).
ISO 10101-2 and ISO 10101-3 specify two individual methods of determination, a titration procedure
and a coulometric procedure, respectively.
2 Normat
...