EN ISO 10101-3:1998
(Main)Natural gas - Determination of water by the Karl Fischer method - Part 3: Coulometric procedure (ISO 10101-3:1993)
Natural gas - Determination of water by the Karl Fischer method - Part 3: Coulometric procedure (ISO 10101-3:1993)
The principle of the method specified is passing a measured volume of gas through the titration cell, where the water is absorbed by the anodic solution. The iodine required for the determination of water by the Karl Fischer reaction is generated coulometrically from iodide. The quantity of electricity is directly proportional to the mass of iodine generated and hence to the mass of water determined. Applies to natural gas and other gases which do not react with Karl Fischer reagents. Is applicable to water concentrations between 5 mg/cm^3 and 5000 mg/cm^3.
Erdgas - Bestimmung des Wassergehaltes nach Karl Fischer - Teil 3: Coulometrisches Verfahren (ISO 10101-3:1993)
Dieser Teil von ISO 10101 beschreibt ein coulometrisches Verfahren zu direkten Bestimmung des Wassergehaltes nach Karl Fischer. Das Verfahren gilt für Erdgas und andere Gase, die nicht mit Karl-Fischer-Lösung reagieren. Es gilt für Wasser-Konzentrationen zwischen 5 mg/m3. Die Volumina beziehen sich auf eine Temperatur von 273,15 K (0 °C) und einen Druck von 101,325 kPa (1 atm).
Gaz naturel - Dosage de l'eau par la méthode de Karl Fischer- Partie 3: Méthode coulométrique (ISO 10101-3:1993)
La présente partie de l'ISO 10101 prescrit un mode coulométrique pour le dosage direct de l'eau selon le procédé de Karl Fischer. La méthode est applicable au gaz naturel et à d'autres gaz ne réagissant pas avec le réactif de Karl Fischer. Elle est applicable à des concentrations d'eau comprises entre 5 mg/m3 et 5 000 mg/m3. Les volumes exprimés en mètres cubes sont ramenés à une température de 273,15 K (0°C) et une pression de 101,325 kPa (1 atm).
Zemeljski plin - Določevanje vode po Karl-Fischerjevi metodi - 3. del: Kulometrični postopek (ISO 10101-3:1993)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2000
=HPHOMVNLSOLQ'RORþHYDQMHYRGHSR.DUO)LVFKHUMHYLPHWRGLGHO .XORPHWULþQL
SRVWRSHN ,62
Natural gas - Determination of water by the Karl Fischer method - Part 3: Coulometric
procedure (ISO 10101-3:1993)
Erdgas - Bestimmung des Wassergehaltes nach Karl Fischer - Teil 3: Coulometrisches
Verfahren (ISO 10101-3:1993)
Gaz naturel - Dosage de l'eau par la méthode de Karl Fischer- Partie 3: Méthode
coulométrique (ISO 10101-3:1993)
Ta slovenski standard je istoveten z: EN ISO 10101-3:1998
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL IS0
STANDARD 10101-3
First edition
1993-l o-01
- Determination of water by
Natural gas
the Karl Fischer method -
Part 3:
Coulometric procedure
Gaz na turel - Dosage de I’eau par la mbthode de Karl Fischer -
Partie 3: M6 thode coulomb trique
Reference number
IS0 101 01-3:1993(E)
IS0 10101=3:1993(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 10101-3 was prepared by Technical Committee
lSO/TC 193, Natural gas, Sub-Committee SC 1, Analysis of natural gas.
IS0 10101 consists of the following parts, under the general title Natural
- Determination of water by the Karl Fischer method:
gas
- Part 1: Introduction
- Part 2: Titration procedure
- Part 3: Coulometric procedure
0 IS0 1993
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
INTERNATIONAL STANDARD
IS0 10101-3:1993(E)
- Determination of water by the Karl
Natural gas
Fischer method -
Part 3:
Coulometric procedure
WARNING - Local safety regulations must be taken into account, when the equipment is located
in hazardous areas. Due.to the toxicity and odour of pyridine, the user should ensure that there is
adequate ventilation.
IS0 10101-1 :I 993, Natural gas - Determination of
1 Scope
water by the Karl Fischer method - Part I: lntro-
duction.
This part of IS0 10101 specifies a coulometric pro-
cedure for the direct determination of water content
by the Karl Fischer method. The method applies to
3 Principle
natural gas and other gases which do not react with
A measured volume of gas is passed through the
Karl Fischer reagents.
titration cell, where the water is absorbed by the
It applies to water concentrations between 5 mg/m3
anodic solution. The iodine required for the determi-
and 5 000 mg/m3. Volumes are expressed a tem-
nation of water by the Karl Fischer reaction is gener-
perature of 273,15 K (0 “C) and a pressure of
ated coulometrically from iodide. The quantity of
101,325 kPa (1 atm).
electricity is directly proportional to the mass of iodine
generated and hence to the mass of water deter-
mined.
The principle and chemical reactions of the Karl
Fischer method are given in IS0 IOlOl-1:1993,
2 Normative references
clauses 3 and 4; interferences are also described in
clause 4 of IS0 10101-1.
The following standards contain provisions which,
through reference in this text, constitute provisions
4 Reagents
of this part of IS0 10101. At the time of publication,
the editions indicated were valid. All standards are
specially formulated for
subject to revision, and parties to agreements based 4.1 Reagents
on this part of IS0 10101 are encouraged to investi- coulometric determination.
gate the possibility of applying the most recent edi-
NOTE 1 A typical composition of the anodic solution is
tions of the standards indicated below. Members of
34 % (m/m) trichloromethane, 3 % (m/m)
as follows:
IEC and IS0 maintain registers of currently valid
tetrachloromethane, 22 % (m/m) methanol, the remainder
International Standards.
being sulfur dioxide and pyridine.
IS0 5725:1986, Precision of test methods - Deter-
Other reagents may be used, for the coulometric determi-
mination of repeatability and reproducibility for a nation by the Karl Fischer method, if they have shown to
standard test method by inter-laboratory tests. be satisfactory.
IS0 10101-3:1993(E)
NOTE 2 The optimum flowrate depends on the geometry
4.2 Reference solution, e.g. water and methanol
of the equipment. A check that all the water is being ab-
mixture, with a water content of 50 mg/l + 4 % or
sorbed should be carried out by passing the same volume
10,O mg/l + 4 %. Keep this solution in a flask sealed
-
of gas at different flowrates and ensuring that equal results
with a septum.
are obtained.
For low water concentrations, it may be preferable to delay
43 . Phosphorus pentoxide, with indicator.
the determination until the required volume has been
passed. The d
...
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