ISO 23904:2020

INTERNATIONAL ISO
STANDARD 23904
First edition
2020-06
Cigarettes — Determination of selected
phenolic compounds in cigarette
mainstream smoke with an intense
smoking regime using HPLC-FLD
Cigarettes — Dosage de composés phénoliques sélectionnés dans le
courant principal de la fumée de cigarette avec un régime de fumage
intense par CLHP-FLD
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Reagents . 2
7 Preparation . 3
7.1 General . 3
7.2 Preparation of solutions — Acetic acid, with a volume fraction of 1 % solution . 3
7.3 Preparation of standards. 3
7.3.1 Primary phenolic compounds stock solutions . 3
7.3.2 Secondary phenolic compounds stock solutions . 3
7.3.3 Phenolic compounds working standards . 4
8 Sampling . 4
9 Tobacco product preparation . 4
10 Sample generation — Smoking of cigarettes . 4
10.1 General . 4
10.2 Smoking machine setup . 4
10.3 Smoking . 4
11 Sample analysis . 5
11.1 Preparation of sample. 5
11.2 Determination . 5
11.2.1 HPLC-FLD operating conditions . 5
11.2.2 Calibration . 6
11.2.3 Calculation . 6
12 Repeatability and reproducibility . 7
12.1 General . 7
12.2 Results of the 2013 collaborative study . 8
13 Report .10
Annex A (informative) Examples of chromatograms .11
Bibliography .12
Foreword
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iv © ISO 2020 – All rights reserved

Introduction
1) 2)
The CORESTA Smoke Analytes Sub-Group selected one method using reversed phase high
performance liquid chromatography with fluorescence detection (HPLC-FLD) for the determination
of selected phenolic compounds in cigarette mainstream smoke. Smoke was collected on a glass fibre
filter pad and extracted with a 1 % acetic acid solution.
[1]
A CORESTA recommended method (CRM) was written on the basis of the results obtained in a
interlaboratory study conducted in 2013 involving 18 laboratories using cigarettes manufactured from
a range of blend styles. Cigarettes were smoked with the intense smoking regime specified in Health
Canada Official Method T-115 (equivalent to ISO 20778).
This document is based upon the CRM 78 and includes statistical evaluations carried out according to
[2] [3]
ISO 5725-1 and ISO 5725-2 .
No machine smoking regime can represent all human smoking behaviour.
— It is recommended that cigarettes also be tested under conditions of a different intensity of machine
smoking than those specified in this document.
— Machine smoking testing is useful to characterize cigarette emissions for design and regulatory
purposes, but communication of machine measurements to smokers can result in misunderstandings
about exposure and risk across brands.
— Smoke emission data from machine measurements may be used as inputs for product hazard
assessment, but they are not intended to be nor are they valid as measures of human exposure or
risks. Communicating differences between products in machine measurements as differences in
exposure or risk is a misuse of testing using ISO standards.
1) Available at: www .coresta .org.
2) Until 2017, this was referred to as CORESTA Special Analytes Sub-group.
INTERNATIONAL STANDARD ISO 23904:2020(E)
Cigarettes — Determination of selected phenolic
compounds in cigarette mainstream smoke with an intense
smoking regime using HPLC-FLD
WARNING — The use of this document involves hazardous materials, operations and equipment.
This document does not purport to address all the safety problems associated with its use. It
is the responsibility of the user of this document to establish appropriate safety and health
practices and determine the applicability of any other restrictions prior to use.
1 Scope
This document specifies a method for the quantification of selected phenolic compounds by high
performance liquid chromatography with fluorescence detection (HPLC-FLD) using ISO 20778 smoking
parameters. The selected phenolic compounds are: hydroquinone, resorcinol, catechol, phenol, p-Cresol,
m-Cresol and o-Cresol.
This method is applicable to cigarettes with total particulate matter (TPM) yields between 20 mg/
cigarette and 45 mg/cigarette.
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 8243, Cigarettes — Sampling
ISO 20778, Cigarettes — Routine analytical cigarette smoking machine — Definitions and standard
conditions with an intense smoking regime
ISO 20779, Cigarettes — Generation and collection of total particulate matter using a routine analytical
smoking machine with an intense smoking regime
3 Terms and definitions
No terms and definitions are listed in this document.
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/
4 Principle
Selected phenolic compounds are collected by passing the mainstream smoke of cigarettes through a
glass fibre filter pad as specified in ISO 20779 (e.g. Cambridge filter pad, CFP), with intense smoking
regime as specified in ISO 20778.
The CFP is extracted by a 1 % acetic acid solution. The obtained filtered solution is diluted and analysed
by HPLC-FLD.
5 Apparatus
The usual laboratory apparatus for use in preparation of samples, solutions and standards and, in
particular, the following.
5.1 Routine analytical cigarette-smoking machine, complying with the requirements of ISO 20778.
5.2 High performance liquid chromatography system, consisting of a binary gradient pump, an
auto sampler with sampling loop and cooling unit, a fluorescence detector, a data collection system.
5.3 HPLC column, with pentafluorphenylpropyl (PFP) stationary phase (e.g. 3 µm, 150 mm × 4,6 mm
or equivalent).
5.4 Disposable guard column, such as PFP cartridge (e.g. 4 mm × 3,00 mm or equivalent).
5.5 Wrist action shaker, or equivalent.
5.6 Analytical balance, suitable for measuring to the nearest 0,1 mg.
5.7 Glassware, actinic red Erlenmeyer flasks of appropriate volumes with ground glass stoppers,
actinic red volumetric flasks (10 ml, 25 ml and 50 ml).
5.8 Mechanical pipettes with dis
...