ISO/TS 22491:2019

TECHNICAL ISO/TS
SPECIFICATION 22491
First edition
2019-05
Water pipe tobacco — Determination
of carbon monoxide in the vapour
phase of water pipe tobacco smoke —
NDIR method
Reference number
ISO/TS 22491:2019(E)
©
ISO 2019

---------------------- Page: 1 ----------------------
ISO/TS 22491:2019(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

---------------------- Page: 2 ----------------------
ISO/TS 22491:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Standard gas mixtures . 3
7 Procedure. 3
7.1 Storage and conditioning . 3
7.2 Calibration of the NDIR analyser . 3
7.3 Smoking and collection of vapour phase . 3
7.3.1 Preparation of vapour-phase collection system . 3
7.3.2 Smoking procedure . 4
7.4 Measurement of carbon monoxide volume concentration . 4
8 Expression of results . 4
8.1 Calculation of the average volume of carbon monoxide per water pipe tobacco portion . 4
8.2 Calculation of the average mass of carbon monoxide per water pipe tobacco portion . 5
9 Repeatability and reproducibility . 5
10 Test report . 5
10.1 General . 5
10.2 Characteristic data about the water pipe tobacco sample and identification . 5
10.3 Sampling . 6
10.4 Description of test . 6
10.5 Test results. 6
Bibliography . 7
© ISO 2019 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/TS 22491:2019(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 of 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 www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products.
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

---------------------- Page: 4 ----------------------
TECHNICAL SPECIFICATION ISO/TS 22491:2019(E)
Water pipe tobacco — Determination of carbon
monoxide in the vapour phase of water pipe tobacco
smoke — NDIR method
1 Scope
This document specifies a method for the determination of carbon monoxide (CO) in the vapour phase
of water pipe tobacco smoke.
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 3402, Tobacco and tobacco products — Atmosphere for conditioning and testing
ISO 22486, Water pipe tobacco smoking machine — Definitions and standard conditions
ISO/TS 22487, Water pipe tobacco — Determination of total collected matter and nicotine using a water
pipe tobacco smoking machine
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/
3.1
vapour phase
portion of smoke, which passes the smoke trap during smoking in accordance with ISO/TS 22487 using
a machine conforming to ISO 22486
4 Principle
Smoking of water pipe tobacco in accordance with the procedures given in ISO/TS 22487. Collection of
the vapour phase of the water pipe tobacco smoke and measurement of the carbon monoxide using a
non-dispersive infrared (NDIR) analyser calibrated for carbon monoxide. Calculation of the amount of
carbon monoxide per water pipe tobacco test portion.
5 Apparatus
Usual laboratory apparatus and, in particular, the following items.
5.1 Routine analytical water pipe tobacco smoking machine and accessories, complying with the
requirements of ISO 22486.
© ISO 2019 – All rights reserved 1

---------------------- Page: 5 ----------------------
ISO/TS 22491:2019(E)

5.2 Vapour-phase collection system, which can be fitted to the water pipe smoking machine. The
use of the system shall ensure collection of all the vapour phase (normally vented to atmosphere) to be
stored in a previously evacuated container for subsequent sampling through an NDIR analyser.
The collection system shall not cause interference with the normal performance of the smoking machine
and the consequent determination of total particulate matter and nicotine.
The impermeability of the vapour phase collecting device to a vapour phase shall be checked with a
vapour phase containing a volume fraction of 4 % to 6 % of CO. The CO concentration shall be measured
directly after filling the previously evacuated vapour phase-collecting device. After a period of not less
than 2 h, the measured value of CO concentration in the vapour phase in the device shall not differ by
more than a volume fraction of 0,2 % from the value expected from the first determination.
When a bag is used as the vapour phase-collecting device, it shall be large enough to avoid the final
pressure of its contents exceeding the ambient atmospheric pressure. The volume of the bag should also
be no greater than twice the volume of the vapour phase collected at atmospheric pressure. In practice,
the collection of the vapour phase from 175 puff
...