EN 14662-4:2005

SLOVENSKI STANDARD
01-september-2005
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Ambient air quality - Standard method for measurement of benzene concentrations - Part
4: Diffusive sampling followed by thermal desorption and gas chromatography
Außenluftbeschaffenheit - Standardverfahren zur Bestimmung von
Benzolkonzentrationen - Teil 4: Diffusionsprobenahme mit anschließender
Thermodesorption und Gaschromatographie
Qualité de l'air ambiant - Méthode normalisée pour le mesurage de la concentration en
benzene - Partie 4: Prélevement par diffusion suivi d'une désorption thermique et d'une
analyse par chromatographie en phase gazeuse
Ta slovenski standard je istoveten z: EN 14662-4:2005
ICS:
13.040.20 Kakovost okoljskega zraka Ambient atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14662-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 13.040.20
English version
Ambient air quality - Standard method for measurement of
benzene concentrations - Part 4: Diffusive sampling followed by
thermal desorption and gas chromatography
Qualité de l'air ambiant - Méthode pour le mesurage des Luftbeschaffenheit - Standardverfahren zur Bestimmung
concentrations en benzène - Partie 4 - Echantillonnage par von Benzolkonzentrationen - Teil 4: Diffusionsprobenahme
diffusion suivi d'une désorption thermique et d'une mit anschließender Thermodesorption und
chromatographie en phase gazeuse Gaschromatographie
This European Standard was approved by CEN on 21 March 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14662-4:2005: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3  Terms and definitions.4
4 Method description.6
4.1 Principle.6
4.2 Reagents and materials.7
4.3 Apparatus .9
4.4 Sample tube conditioning .10
4.5 Sampling.10
4.6 Procedure .11
4.7 Calculation of mass concentration of benzene .13
4.8 Report .14

5 Determination of measurement uncertainty .14
5.1 Introduction.14
5.2 Parameters contributing to measurement uncertainty .14
6 Recommendations for use .16
Annex A (informative) Diffusive uptake rates for benzene on sorbent tubes (without membrane) .17
Annex B (informative) Description of sorbent types.18
Annex C (informative) Guidance on sorbent selection.19
Annex D (informative) Guide on sorbent use .20
Annex E (informative) Assessment of performance indicators and uncertainty contributions .21
Annex F (informative) Performance characteristics .30
Bibliography.32

Foreword
This European Standard (EN 14662-4:2005) has been prepared by Technical Committee CEN/TC 264 “Air
Quality”, the secretariat of which is held by DIN.
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 November 2005, and conflicting national standards shall be withdrawn
at the latest by November 2005.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive 2000/69/EC and EU
Directive 96/62 EC.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
1 Scope
This part of EN 14662 is in accordance with the generic methodology selected as the basis of the European
Union for the determination of benzene in ambient air [1] for the purpose of comparison of measurement
results with limit values with a one-year reference period.
This part of EN 14662 gives general guidance for the sampling and analysis of benzene in air by diffusive
sampling, thermal desorption and capillary gas chromatography.
This part of EN 14662 is valid for the measurement of benzene in a concentration range of approximately 0,5
3 3
µg/m to 50 µg/m in an air sample typically collected over a period of 14 days.
The upper limit of the useful range is set by the sorptive capacity of the sorbent and by the linear dynamic
range of the gas chromatograph column and detector or by the sample splitting capability of the analytical
instrumentation used. The lower limit of the useful range depends on the noise level of the detector and on
blank levels of benzene and/or interfering artefacts on the sorbent. Artefacts are typically sub ng for sorbents
such as graphitised carbon, but higher levels of aromatic hydrocarbons have been noted in other sorbents.
2 Normative references
The following referenced documents are indispensable for the application 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.
ENV 13005:1999, Guide to the expression of uncertainty in measurement
EN 13528-2:2002, Ambient air quality - Diffusive samplers for the determination of concentrations of gases
and vapours - Requirements and test methods. Part 2: Specific requirements and test methods
EN 13528-3:2003, Ambient air quality - Diffusive samplers for the determination of concentrations of gases
and vapours - Requirements and test methods - Part 3: Guide to selection, use and maintenance
EN ISO 16017-2, Indoor, ambient and workplace air – Sampling and analysis of volatile organic compounds
by sorbent tube/thermal desorption/capillary gas chromatography – Part 2: Diffusive sampling (ISO 16071-
2:2003)
EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories ( ISO/IEC
17025:1999)
ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic
method for the determination of repeatability and reproducibility of a standard measurement method
ISO 5725-3:1995, Accuracy (trueness and precision) of measurement methods and results - Part 3:
Intermediate measures of the precision of a standard measurement method

3  Terms and definitions
For the purposes of this European Standard, the following definitions apply.
NOTE: Attention is drawn to the fact that the terms Ambient Air and Limit Value are defined in Directive 96/62/EC [2].
3.1
certified reference material
A reference material [3.7], accompanied by a certificate, one or more of whose property values are certified by
a procedure which establishes its traceability to an accurate realisation of the unit in which the property values
are expressed, and for which each certified value is accompanied by an uncertainty at a stated level of
confidence.
[ISO Guide 30:1992]
3.2
combined standard uncertainty
Standard uncertainty of the result of a measurement when that result is obtained from the values of a number
of other quantities, equal to the positive square root of a sum of terms, the terms being the variances or
covariances of these other quantities weighted according to how the measurement result varies with changes
in these quantities
[ENV 13005:1999]
3.3
desorption efficiency
Ratio of the mass of analyte desorbed from a sampling device to that applied
[EN 838:1995]
3.4
diffusive sampler
A device which is capable of taking samples of gases or vapours from the atmosphere at a rate controlled by
a physical process such as gaseous diffusion through a static air layer or a porous material and/or permeation
through a membrane, but which does not involve the active movement of air through the device
[EN 13528-1]
NOTE 1  Active normally refers to the pumped movement of air.
NOTE 2  This definition differs from that in EN 838:1995 by the addition of the words “or a porous material”.
3.5
diffusive uptake rate
The rate at which the diffusive sampler collects a particular gas or vapour from the atmosphere, expressed in
picograms per parts per billion per minute (pg/ppb/min) or cubic centimetres per minute (cm /min)

NOTE 1  pg/ppb/ min are equivalent to ng/ppm/ min.
NOTE 2 This definition differs from that in EN 838:1995 by the substitution of “picograms per parts per billion” for
“nanograms per parts per million”. The expression is numerically the same, but ambient concentrations are usually in the
ppb range.
3.6
expanded uncertainty
Quantity defining an interval about the result of a measurement that may be expected to encompass a large
fraction of the distribution of values that could reasonably be attributed to the measurand
[ENV 13005:1999]
NOTE 1 The fraction may be viewed as the coverage probability or level of confidence of the interval.

-9 -6
ppb is volume fraction, (φ)=10 ; ppm is volume fraction, (φ)=10 .
NOTE 2 To associate a specific level of confidence with the interval defined by the expanded uncertainty requires explicit
of implicit assumptions regarding the probability distribution characterised by the measurement result and its combined
standard uncertainty. The level of confidence that can be attributed to the interval can be known only to the extent to which
such assumptions may be justified.
NOTE 3 Expanded uncertainty is termed overall uncertainty in ENV 13005:1999.
3.7
reference material
A material or substance, one or more of whose property values are sufficiently homogeneous and well
established to be used for the calibration of an apparatus, the assessment of a measurement method, or for
assigning values to materials.
[ISO Guide 30:1992]
3.8
repeatability conditions
Conditions where independent test results are obtained with the same method on identical test items in the
same laboratory by the same operator using the same equipment within short intervals of time
[ISO 3534-1:1993]
3.9
standard uncertainty
Uncertainty of the result of a measurement expressed as a standard deviation
[ENV 13005:1999]
3.10
uncertainty (of measurement)
Parameter, associated with the results of a m
...