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 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

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
Foreword
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iv © ISO 2019 – All rights reserved

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.
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
...