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SLOVENSKI STANDARD
01-januar-2023
Nadomešča:
SIST EN 12177:1999
SIST EN 12177:1999/AC:2001
Tekoči naftni proizvodi - Neosvinčeni motorni bencini - Določevanje benzena s
plinsko kromatografijo
Liquid petroleum products - Unleaded petrol - Determination of benzene content by gas
chromatography
Flüssige Mineralölerzeugnisse - Unverbleite Ottokraftstoffe - Bestimmung des
Benzolgehaltes mittels Gaschromatographie
Produits pétroliers liquides - Essence sans plomb - Détermination de la teneur en
benzène par chromatographie en phase gazeuse
Ta slovenski standard je istoveten z: EN 12177:2022
ICS:
75.160.20 Tekoča goriva Liquid fuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 12177
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 75.160.20 Supersedes EN 12177:1998
English Version
Liquid petroleum products - Unleaded petrol -
Determination of benzene content by gas chromatography
Produits pétroliers liquides - Essence sans plomb - Flüssige Mineralölerzeugnisse - Unverbleiter
Détermination de la teneur en benzène par Ottokraftstoff - Bestimmung des Benzolgehaltes mittels
chromatographie en phase gazeuse Gaschromatographie
This European Standard was approved by CEN on 16 October 2022.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12177:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Reagents and materials . 5
6 Apparatus . 5
6.1 Gas chromatographic assembly . 5
7 Sampling . 6
8 Procedure . 7
8.1 Setup of the apparatus . 7
8.1.1 General. 7
8.1.2 Carrier gas . 7
8.2 Calibration . 7
8.3 Determination of density . 7
8.4 Preparation of test sample . 7
8.5 Introduction of test portion . 8
8.6 Examination of the chromatogram . 8
9 Calculation . 8
9.1 Calculation of mass of benzene in the test sample . 8
9.2 Calculation of volume of benzene in the test sample . 8
9.3 Calculation of volume of test sample . 8
9.4 Calculation of benzene content as % (V/V) . 9
10 Expression of results . 9
11 Precision . 9
11.1 General. 9
11.2 Repeatability, r . 9
11.3 Reproducibility, R . 9
12 Test report . 10
Annex A (informative) Guidance on the column switching technique . 11
A.1 Introduction . 11
A.2 General apparatus parameters for the flow switching technique . 12
A.3 Gas chromatogram . 12
Bibliography . 15
European foreword
This document (EN 12177:2022) has been prepared by Technical Committee CEN/TC 19 “Gaseous and
liquid fuels, lubricants and related products of petroleum, synthetic and biological origin”, the secretariat
of which is held by NEN.
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 May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12177:1998.
At the time of the development of the test method, the ethanol content of gasoline was limited to
5 % (V/V) which was reflected in the scope of the test method. Since several years, fuels containing up to
10 % of ethanol (3,7 % (m/m)) are common in the European market. This revision is meant to extend the
scope of the test methods to those fuels, thus reflecting market needs.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document specifies a column switching gas chromatographic method for the quantitative
determination of benzene content in the range 0,05 % (V/V) to 6 % (V/V) in unleaded petrol having a
final boiling point not greater than 220 °C.
The method described in this document is suitable for determining benzene in petrol, including petrol
containing oxygenates up to E10 (up to 3,7 % (m/m) oxygen content), in line with the relevant EC
Directives [1].
NOTE For the purposes of this document, the terms "% (V/V)" and "% (m/m)" are used to represent
respectively the volume fraction and the mass fraction.
WARNING — Use of this document might involve hazardous materials, operations and equipment. This
document does not purport to address all of 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 regulatory limitations prior to use.
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.
EN ISO 3170, Petroleum liquids — Manual sampling (ISO 3170)
EN ISO 3171, Petroleum liquids — Automatic pipeline sampling (ISO 3171)
EN ISO 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density —
Hydrometer method (ISO 3675)
EN ISO 3838, Crude petroleum and liquid or solid petroleum products — Determination of density or
relative density — Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods (ISO
3838)
EN ISO 12185, Crude petroleum and petroleum products — Determination of density — Oscillating U-tube
method (ISO 12185)
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:
— IEC Electropedia: available at
— ISO Online browsing platform: available at /
4 Principle
The benzene-containing fraction is isolated from the sample using a capillary column and, in a second
capillary column, the benzene is separated and detected using a flame ionization detector.
NOTE 1 Some oxygenates are known to interfere with the determination of benzene using a single column gas
chromatographic method.
NOTE 2 Guidance on the column switching technique is given in Annex A.
5 Reagents and materials
Use only chemicals and reagents of recognized analytical grade.
5.1 Gases
5.1.1 Carrier gas, helium, nitrogen or hydrogen, of at least 99,999 % (V/V) purity. Any oxygen
present is removed by a chemical resin filter.
5.1.2 Hydrogen, grade suitable for flame ionization detectors.
5.1.3 Compressed air regulated for flame ionization detectors.
WARNING - Hydrogen is explosive in mixtures with air at concentrations of hydrogen ranging
approximately from 4 % (V/V) to 75 % (V/V). All joints and lines carrying hydrogen shall be made gas
tight to prevent leakage of hydrogen into a confined space.
5.2 Reagents for the preparation of calibration samples
NOTE Calibration samples will normally be combinations of benzene, solvent and an internal standard.
5.2.1 Benzene, not less than 99,0 % (m/m) pure.
WARNING - Benzene is toxic and carcinogenic.
5.2.2 Solvent, not containing benzene or internal standard, e.g. heptane.
5.3 Internal standard, reagent for which it has been established that it is not present in the sample.
NOTE Isobutyl methyl ketone is preferred as the internal standard.
6 Apparatus
Usual laboratory apparatus and glassware, together with the following:
6.1 Gas chromatographic assembly
6.1.1 Gas chromatograph, provided with a means for column switching, equipped with a
programmable oven temperature controller, or controllers in the case of dual oven gas chromatographs,
a split injector and two flame ionization detectors (FID). See Annex A for typical operating conditions.
It is recommended that a system constructed entirely of glass from the sample injection port up to the
detector system is used since petrol may contain oxygenates which can give rise to corrosion and changes
of retention times in systems constructed partly using metals.
6.1.2 Two capillary columns, of appropriate dimensions, each internally coated with a substance of
different polarity, such that the resolution between the benzene peak and the matrix is at least 1 after
elution from the second column.
The resolution, R, between peaks A and B (see Fig
...