Ethanol as a blending component for petrol - Determination of pHe

This European Standard describes a procedure for the determination of acid strength, as a pHe value, of ethanol to be used as a blend component for gasoline.
NOTE   For the purposes of this European Standard, the term “% (V/V)” is used to represent the volume fraction.

Ethanol zur Verwendung als Blendkomponente in Ottokraftstoff - Bestimmung des pHe-Wertes

Ethanol comme base de mélange a l'essence - Détermination du pHe

La présente Norme européenne prescrit une procédure pour la détermination de l’acidité, sous forme de pHe, de l’éthanol utilisé comme base de mélange à l'essence pour automobiles.
Pour des informations supplémentaires concernant l'applicabilité de ce document, le lecteur peut se référer à l'Annexe A.
NOTE   Pour les besoins de la présente Norme européenne, le terme « % (V/V) » est utilisé pour représenter la fraction volumique.

Etanol kot komponenta za dodajanje motornemu bencinu – Določevanje pH vrednosti

General Information

Status
Published
Publication Date
24-Oct-2007
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Oct-2007
Due Date
09-Dec-2007
Completion Date
25-Oct-2007

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SIST EN 15490:2007
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ethanol as a blending component for petrol - Determination of pHeYUHGQRVWLEthanol comme base de mélange a l'essence - Détermination du pHeEthanol zur Verwendung als Blendkomponente in Ottokraftstoff - Bestimmung des pHe-WertesTa slovenski standard je istoveten z:EN 15490:2007SIST EN 15490:2007en75.160.20Liquid fuels71.080.60Alkoholi. EtriAlcohols. EthersICS:SLOVENSKI

STANDARDSIST EN 15490:200701-december-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15490August 2007ICS 71.080.60 English VersionEthanol as a blending component for petrol - Determination ofpHeEthanol comme base de mélange à l'essence -Détermination du pHeEthanol zur Verwendung als Blendkomponente inOttokraftstoff - Bestimmung des pHe-WertesThis European Standard was approved by CEN on 30 June 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15490:2007: E

EN 15490:2007 (E)

2 Contents Page Foreword.............................................................................................................................................................3 1 Scope......................................................................................................................................................4 2 Normative references...........................................................................................................................4 3 Terms and definitions...........................................................................................................................4 4 Principle.................................................................................................................................................4 5 Reagents and materials........................................................................................................................4 6 Apparatus..............................................................................................................................................5 7 Sampling and sample handling...........................................................................................................5 8 Apparatus preparation..........................................................................................................................5 9 pH meter and electrode system calibration.......................................................................................5 10 Apparatus verification..........................................................................................................................6 11 Procedure..............................................................................................................................................6 12 Expression of results............................................................................................................................7 13 Precision................................................................................................................................................7 13.1 General...................................................................................................................................................7 13.2 Repeatability, r......................................................................................................................................7 13.3 Reproducibility, R.................................................................................................................................7 14 Test report.............................................................................................................................................8 Annex A (informative)

Background to actual fuel specification needs........................................................9 Bibliography.....................................................................................................................................................10

EN 15490:2007 (E) 3 Foreword This document (EN 15490:2007) 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 February 2008, and conflicting national standards shall be withdrawn at the latest by February 2008. This document was prepared by CEN/TC 19’s Ethanol Task Force and is based on an extract and translation from a French Wine Regulation [1]. This method has been developed for European fuel ethanol specifications. Interlaboratory studies found that the method is not robust enough. Therefore it is better not to use it to determine the presence of any strong acids or alkalis that may be present in fuel ethanol. This Standard has insufficient precision to fulfill actual fuel specification needs (see Annex A). A test for strong acid and for the presence of alkaline substance will be developed by CEN/TC 19 to replace the pHe test method. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EN 15490:2007 (E) 4 1 Scope This European Standard describes a procedure for the determination of acid strength, as a pHe value, of ethanol to be used as a blend component for gasoline. For further background on the applicability of this document, the user is referred to the information in Annex A. NOTE For the purposes of this European Standard, the term “% (V/V)” is used to represent the volume fraction. 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. EN ISO 3170, Petroleum liquids — Manual sampling (ISO 3170:2004) EN ISO 3696, Water for analytical laboratory use – Specification and test methods (ISO 3696:1987) 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 pHe measure of the acid strength 4 Principle The pHe of a test portion of ethanol held at 22 °C ± 2 °C is measured using an electrode containing lithium chloride (LiCl) in an ethanol medium connected to a pH meter system. NOTE In non-aqueous media, it is not possible to carry out absolute pH measurements and a pHe value is not directly comparable to pH values of water solutions. 5 Reagents and materials Use only reagents of recognized analytical grade. 5.1 Buffer solutions, of pH (4,00 ± 0,02), pH (7,00 ± 0,02) and pH (10,00 ± 0,02), within their valid period for use. CAUTION — Buffer solutions can deteriorate with time and it is important that they are used within their valid period of use. NOTE Buffer solutions may be prepared from either commercially available tablets dissolved in water or commercially available aqueous solutions. 5.2 Ethanol, 99 % (V/V) containing 1 % (V/V) water. 5.3 Water, conforming to Grade 3 of EN ISO 3696.

EN 15490:2007 (E) 5 5.4 Lithium chloride solution,
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