EN 14662-2:2005

SLOVENSKI STANDARD
01-september-2005
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Ambient air quality - Standard method for measurement of benzene concentrations - Part
2 : Pumped sampling followed by solvent desorption and gas chromatography
Luftbeschaffenheit - Standardverfahren zur Messung von Benzolkonzentrationen - Teil 2:
Probenahme mit einer Pumpe mit anschließender Lösemitteldesorption und
Gaschromatographie
Qualité de l'air ambiant - Méthode normalisée pour le mesurage de la concentration en
benzene - Partie 2 : Prélevement par pompage suivi d'une désorption au solvant et d'une
analyse par chromatographie en phase gazeuse
Ta slovenski standard je istoveten z: EN 14662-2:2005
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 14662-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2005
ICS 13.040.20
English version
Ambient air quality - Standard method for measurement of
benzene concentrations - Part 2 : Pumped sampling followed by
solvent desorption and gas chromatography
Qualité de l'air ambiant - Méthode pour le mesurage des Luftbeschaffenheit - Standardverfahren zur Messung von
concentrations en benzène - Partie 2 : Echantillonnage par Benzolkonzentrationen - Teil 2: Probenahme mit einer
pompage suivi d'une désorption au solvant et d'une Pumpe mit anschließender Lösemitteldesorption 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 14662-2:2005: E
worldwide for CEN national Members.

Contents
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 .6
4.3 Apparatus .9
4.4 Setting of sampling flow rate .10
4.5 Sampling.10
4.6 Procedure .11
4.7 Calculation of mass concentration of benzene .12
4.8 Report .13
5 Determination of measurement uncertainty .13
5.1 Introduction.13
5.2 Parameters contributing to measurement uncertainty .14
6 Recommendations for use .15
Annex A (informative) Determination of breakthrough volume .16
Annex B (informative) Assessment of performance indicators and uncertainty contributions.18
Annex C (informative) Performance characteristics.28
Bibliography.30

Foreword
This European Standard (EN 14662-2:2005) 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 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 pumped sampling,
solvent 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 µg/m
3 3
to 50 µg/m in an air sample of 1 m volume, typically collected over a period of 24 hours.
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 and in the desorption solvent.
The method described here is based on sampling on sample tubes typically containing 100 mg of activated
charcoal and desorption using carbon disulphide.
Alternative sorbents to activated charcoal may be used provided that the equivalence in performance
characteristics of the procedure is demonstrated.
Alternative desorption solvents to carbon disulphide may be used provided that the equivalence in performance
characteristics of the procedure is demonstrated.
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, Guide to the expression of uncertainty in measurement
EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC
17025:1999)
ISO 6144, Gas analysis – Preparation of calibration gas mixtures – Static volumetric method
ISO 6145, Gas analysis – Preparation of calibration gas mixtures using dynamic volumetric methods
3 Terms and definitions
For the purposes of this European standard the following terms and 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 [3.5], 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 1076:1997]
3.4
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.
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.
3.5
Reference material
A material or substance, one or more of whose property values are sufficiently homogeneous and well established
to be used for the callibration of an apparatus, the assessment of a measurement method, or for assigning values
to materials.
[ISO Guide 30:1992]
3.6
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]
3.7
Sampling efficiency
Ratio of the mass of analyte collected by a sampling device to that applied.
3.8
Standard uncertainty
Uncertainty of the result of a measurement expressed as a standard deviation.
[ENV 13005:1999]
3.9
Uncertainty (of measurement)
Parameter, associated with the results of a measurement, that characterises the dispersion of values that could
reasonably be attributed to the measurand
NOTE 1 The parameter may be, for example, a standard deviation (or given multiple of it), or the half width of an interval
having a stated level of confidence.
NOTE 2 Uncertainty of measurement comprises, in general, many components. Some of these components may be
evaluated from the statistical distribution of the results of a series of measurements and can be characterised by experimental
standard deviations. The other components, which can also be characterised by standard deviations, are evaluated from
assumed probability distributions based on experience or other information.
NOTE 3 It is understood that the result of a measurement is the best estimate of the value of a measurand, and that all
components of uncertainty, including those arising from systematic effects, such as components associated with corrections and
reference standards, contribute to this dispersion.
[ENV 13005:1999].
4 Method description
4.1 Principle
A measured volume of sample air is drawn through an activated charcoal sorbent tube. Provided suitable sampling
conditions are chosen, benzene is retained by the sorbent and thus is removed from the flowing air stream. The
collected vapour is desorbed using carbon disulphide and is analyzed on a gas chromatograph equipped with a
capillary column and a flame ionisation detector or other suitable detector. The analysis is calibrated by means of
charcoal tube calibration standards or calibration solutions of known amounts of benzene in carbon disulphide.
4.2 Reagents and Materials
During the analysis, use only reagents of known purity appropriate to the application.
Use only volumetric glassware and syringes that are calibrated to ensure traceability of volume to primary
standards.
4.2.1 Benzene
Benzene is required as a reagent for calibration purposes and for the determinati
...