SIST EN ISO 20884:2019

Petroleum products - Determination of sulfur content of automotive fuels - Wavelength-dispersive X-ray fluorescence spectrometry (ISO 20884:2019)

This document specifies a wavelength-dispersive X-ray fluorescence (WDXRF) test method for the determination of the sulfur content of liquid, homogeneous automotive fuels from 5 mg/kg to 500 mg/ kg, which have a maximum oxygen content of 3,7 % (m/m). This product range covers: - diesel fuels containing up to about 30 % (V/V) fatty acid methyl esters (FAME), - motor gasolines containing up to about 10 % (V/V) ethanol, - synthetic fuels such as hydrotreated vegetable oil (HVO) and gas to liquid (GTL) having sulfur contents in the range of 5 mg/kg to 45 mg/kg. Products with higher oxygen content show significant matrix effects, e.g. pure FAME used as biodiesel, nevertheless, pure FAME can be analysed when the corresponding procedures are followed (see 5.3 and 8.1). Other products can be analysed with this test method, though precision data for products other than those mentioned have not been established for this document.

Mineralölerzeugnisse - Bestimmung des Schwefelgehaltes in Kraftstoffen - Wellenlängendispersive Röntgenfluoreszenz-Spektrometrie (ISO 20884:2019)

Dieses Dokument legt ein Prüfverfahren der wellenlängendispersiven Röntgenfluoreszenz Analyse (wdRFA) zur Bestimmung des Schwefelgehaltes von flüssigen, homogenen Kraftstoffen von 5 mg/kg bis 500 mg/kg mit einem Sauerstoffgehalt von höchstens 3,7 % (m/m) fest. Dieser Produktbereich umfasst
—   Dieselkraftstoffe mit bis zu etwa 30 % (V/V) Fettsäuremethylester (FAME);
—   Ottokraftstoffe mit bis zu 10 % (V/V) Ethanol;
—   synthetische Kraftstoffe, wie z. B. mit Wasserstoff behandelten Pflanzenkraftstoff (HVO, en: hydrotreated vegetable oil) und Gasverflüssigungskraftstoff (GTL, en: gas to liquid) mit Schwefel-gehalten im Bereich von 5 mg/kg bis 45 mg/kg.
Erzeugnisse mit höherem Sauerstoffgehalt zeigen erhebliche Matrixeffekte, z. B. reiner Biodiesel (Fettsäuremethylester (FAME)). Reiner Biodiesel kann jedoch dennoch analysiert werden, wenn die entsprechenden Verfahren befolgt werden (siehe 5.3 und 8.1).
Andere Erzeugnisse können mit diesem Prüfverfahren analysiert werden, es wurden für dieses Dokument jedoch keine Präzisionsdaten für andere als die hier genannten Erzeugnisse festgelegt.
ANMERKUNG 1   Schwefelgehalte von mehr als 500 mg/kg können nach Verdünnung der Probe bestimmt werden, die Präzision wurde jedoch nicht für verdünnte Proben ermittelt.
ANMERKUNG 2   Für die Zwecke dieses Dokuments wird zur Angabe des Massenanteils, w, einer Substanz „% (m/m)“ und für den Volumenanteil, φ, einer Substanz der Ausdruck „% (V/V)“ verwendet.

Produits pétroliers - Détermination de la teneur en soufre des carburants pour automobiles - Spectrométrie de fluorescence de rayons X dispersive en longueur d'onde (ISO 20884:2019)

Le présent document spécifie une méthode d'essai par fluorescence de rayons X dispersive en longueur d'onde (WDXRF) pour le dosage du soufre dans les carburants liquides homogènes pour automobiles entre 5 mg/kg et 500 mg/kg et dont la teneur en oxygène est au maximum de 3,7 % (m/m). Cette gamme de produits comprend:
—          les carburants diesels (gazoles) contenant jusqu'à environ 30 % (V/V) d'esters méthyliques d'acide gras (EMAG),
—          les essences automobiles contenant jusqu'à environ 10 % (V/V) d'éthanol,
—          les carburants synthétiques, comme les huiles végétales hydrotraitées (HVO) et les carburants liquides produits à partir de gaz (GTL), dont les teneurs en soufre se trouvent dans le domaine 5 mg/kg à 45 mg/kg.
Les produits ayant une teneur en oxygène supérieure à cette valeur présentent des effets de matrice significatifs, par exemple les EMAG purs utilisés comme biocarburants diesel. Ces EMAG purs peuvent néanmoins être analysés si les modes opératoires correspondants sont suivis (voir 5.3 et 8.1).
D'autres produits peuvent être analysés avec cette méthode d'essai, bien qu'il n'a pas été établi de données de fidélité pour des produits autres que ceux mentionnés dans le présent document.
NOTE 1    Les teneurs en soufre supérieures à 500 mg/kg peuvent être déterminées après dilution. Néanmoins, les valeurs de fidélité n'ont pas été établies dans le cas d'échantillons dilués.
NOTE 2    Pour les besoins du présent document, «% (m/m)» et «% (V/V)» sont utilisés pour désigner respectivement la fraction massique, w, et la fraction volumique, φ, d'un produit.

Naftni proizvodi - Določevanje žvepla v gorivih za motorna vozila - Metoda z valovno disperzivno rentgensko fluorescenčno spektrometrijo (ISO 20884:2019)

Ta dokument določa preskusno metodo z valovno disperzivno rentgensko fluorescenčno spektrometrijo (WDXRF) za določevanje žvepla v tekočih, homogenih gorivih za motorna vozila z vsebnostjo žvepla od 5 do 500 mg/kg in maksimalno vsebnostjo kisika 3,7 % (m/m). To vključuje naslednje proizvode: – dizelska goriva, ki vsebujejo do 30 % (V/V) metilnih estrov maščobnih kislin (FAME); – bencin za motorna vozila, ki vsebuje do približno 10 % (V/V) etanola; – sintetična goriva, kot so z vodikom obdelano rastlinsko olje (HVO) in produkti pretvorbe plina v tekočino (GTL) z vsebnostjo od 5 do 45 mg/kg. Pri proizvodih z višjo vsebnostjo kisika so opazni pomembni učinki matrice (npr. čisti metilni ester maščobne kisline, ki se uporablja kot biogorivo); ob upoštevanju ustreznih postopkov je čisti metilni ester maščobne kisline kljub temu mogoče analizirati (glej točki 5.3. in 8.1). To preskusno metodo je mogoče uporabiti za analizo drugih proizvodov, vendar za ta dokument niso bili določeni podatki o natančnosti za proizvode, ki niso navedeni.

General Information

• Status: Published
• Public Enquiry End Date: 30-Dec-2018
• Publication Date: 05-Nov-2019
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: NAD - Petroleum products, lubricants and related products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 16-Oct-2019
• Due Date: 21-Dec-2019
• Completion Date: 06-Nov-2019
• Directive: 98/70/EC - Quality of petrol and diesel fuels (Dir. 93/12/EEC amendment)
• Ref Project: EN ISO 20884:2019 - Petroleum products - Determination of sulfur content of automotive fuels - Wavelength-dispersive X-ray fluorescence spectrometry (ISO 20884:2019)

Relations

• Replaces: SIST EN ISO 20884:2011 - Petroleum products - Determination of sulfur content of automotive fuels - Wavelength-dispersive X-ray fluorescence spectrometry (ISO 20884:2011)
• Effective Date: 01-Dec-2019
• Amended By: SIST EN ISO 20884:2019/A1:2021 - Petroleum products - Determination of sulfur content of automotive fuels - Wavelength-dispersive X-ray fluorescence spectrometry - Amendment 1: Addition of the SSD detector to the Monochromatic excitation part of Table 1 (ISO 20884:2019/Amd 1:2021)
• Effective Date: 01-Dec-2021

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 20884:2019
01-december-2019
Nadomešča:
SIST EN ISO 20884:2011
Naftni proizvodi - Določevanje žvepla v gorivih za motorna vozila - Metoda z
valovno disperzivno rentgensko fluorescenčno spektrometrijo (ISO 20884:2019)
Petroleum products - Determination of sulfur content of automotive fuels - Wavelength-
dispersive X-ray fluorescence spectrometry (ISO 20884:2019)
Mineralölerzeugnisse - Bestimmung des Schwefelgehaltes in Kraftstoffen -
Wellenlängendispersive Röntgenfluoreszenz-Spektrometrie (ISO 20884:2019)
Produits pétroliers - Détermination de la teneur en soufre des carburants pour
automobiles - Spectrométrie de fluorescence de rayons X dispersive en longueur d'onde
(ISO 20884:2019)
Ta slovenski standard je istoveten z: EN ISO 20884:2019
ICS:
75.160.20 Tekoča goriva Liquid fuels
SIST EN ISO 20884:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 20884:2019

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SIST EN ISO 20884:2019


EN ISO 20884
EUROPEAN STANDARD

NORME EUROPÉENNE

October 2019
EUROPÄISCHE NORM
ICS 75.080; 75.160.30 Supersedes EN ISO 20884:2011
English Version

Petroleum products - Determination of sulfur content of
automotive fuels - Wavelength-dispersive X-ray
fluorescence spectrometry (ISO 20884:2019)
Produits pétroliers - Détermination de la teneur en Mineralölerzeugnisse - Bestimmung des
soufre des carburants pour automobiles - Schwefelgehaltes in Kraftstoffen -
Spectrométrie de fluorescence de rayons X dispersive Wellenlängendispersive Röntgenfluoreszenz-
en longueur d'onde (ISO 20884:2019) Spektrometrie (ISO 20884:2019)
This European Standard was approved by CEN on 5 August 2019.

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, Turkey 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20884:2019 E
worldwide for CEN national Members.

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SIST EN ISO 20884:2019
EN ISO 20884:2019 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 20884:2019
EN ISO 20884:2019 (E)
European foreword
This document (EN ISO 20884:2019) has been prepared by Technical Committee ISO/TC 28 "Petroleum
and related products, fuels and lubricants from natural or synthetic sources" in collaboration with
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 April 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
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 ISO 20884:2011.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
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,
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20884:2019 has been approved by CEN as EN ISO 20884:2019 without any modification.

3

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SIST EN ISO 20884:2019

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SIST EN ISO 20884:2019
INTERNATIONAL ISO
STANDARD 20884
Third edition
2019-08
Petroleum products — Determination
of sulfur content of automotive fuels
— Wavelength-dispersive X-ray
fluorescence spectrometry
Produits pétroliers — Détermination de la teneur en soufre des
carburants pour automobiles — Spectrométrie de fluorescence de
rayons X dispersive en longueur d'onde
Reference number
ISO 20884:2019(E)
©
ISO 2019

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SIST EN ISO 20884:2019
ISO 20884:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

---------------------- Page: 8 ----------------------
SIST EN ISO 20884:2019
ISO 20884:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents . 2
6 Apparatus . 2
7 Sampling . 3
8 Calibration solutions . 3
8.1 Blank solution . 3
8.2 Stock solution . 3
8.3 Calibration solutions . 3
8.4 Storage and stability of the calibration solutions . 4
9 Settings . 4
9.1 Measuring parameters . 4
9.2 Optimization . 4
9.3 Performance check of the spectrometer . 4
10 Calibration . 5
10.1 General . 5
10.2 Calibration solutions . 5
10.3 Calibration curves . 5
10.4 Checking . 6
11 Procedure. 6
11.1 Samples with sulfur contents between 5 mg/kg and 60 mg/kg . 6
11.2 Samples with sulfur contents between 60 mg/kg and 500 mg/kg. 6
12 Expression of results . 6
13 Precision . 7
13.1 General . 7
13.2 Repeatability, r . 7
13.3 Reproducibility, R . 7
14 Test report . 7
Annex A (informative) Good practices . 8
Bibliography . 9
© ISO 2019 – All rights reserved iii

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SIST EN ISO 20884:2019
ISO 20884:2019(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing Documents is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates
closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical
standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels
and lubricants from natural or synthetic sources.
This third edition cancels and replaces the second edition (ISO 20884:2011), which has been technically
revised. The main changes compared to the previous edition are as follows:
— extension of the scope to include hydrotreated vegetable oil (HVO) and the synthetic fuel “gas to
liquid” (GTL);
— inclusion of specific procedural steps for instruments utilizing monochromatic excitation.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved

---------------------- Page: 10 ----------------------
SIST EN ISO 20884:2019
INTERNATIONAL STANDARD ISO 20884:2019(E)
Petroleum products — Determination of sulfur content
of automotive fuels — Wavelength-dispersive X-ray
fluorescence spectrometry
WARNING — The use of this document can 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 users of this document to take appropriate measures to
ensure the safety and health of personnel prior to application of the document, and fulfil other
applicable requirements for this purpose.
1 Scope
This document specifies a wavelength-dispersive X-ray fluorescence (WDXRF) test method for the
determination of the sulfur content of liquid, homogeneous automotive fuels from 5 mg/kg to 500 mg/
kg, which have a maximum oxygen content of 3,7 % (m/m). This product range covers:
— diesel fuels containing up to about 30 % (V/V) fatty acid methyl esters (FAME),
— motor gasolines containing up to about 10 % (V/V) ethanol,
— synthetic fuels such as hydrotreated vegetable oil (HVO) and gas to liquid (GTL) having sulfur
contents in the range of 5 mg/kg to 45 mg/kg.
Products with higher oxygen content show significant matrix effects, e.g. pure FAME used as biodiesel,
nevertheless, pure FAME can be analysed when the corresponding procedures are followed (see 5.3
and 8.1).
Other products can be analysed with this test method, though precision data for products other than
those mentioned have not been established for this document.
NOTE 1 Sulfur contents higher than 500 mg/kg can be determined after sample dilution, however, the
precision was not established for diluted samples.
NOTE 2 For the purposes of this document, “% (m/m)” and “% (V/V)” are used to represent the mass fraction,
w, and the volume fraction, φ, of a material respectively.
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 3170, Petroleum liquids — Manual sampling
ISO 3171, Petroleum liquids — Automatic pipeline sampling
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in s
...

SLOVENSKI STANDARD
oSIST prEN ISO 20884:2018
01-december-2018
1DIWQLSURL]YRGL'RORþHYDQMHåYHSODYJRULYLK]DPRWRUQDYR]LOD0HWRGD]
YDORYQRGLVSHU]LYQRUHQWJHQVNRIOXRUHVFHQþQRVSHNWURPHWULMR,62',6

Petroleum products - Determination of sulfur content of automotive fuels - Wavelength-
dispersive X-ray fluorescence spectrometry (ISO/DIS 20884:2018)
Mineralölerzeugnisse - Bestimmung des Schwefelgehaltes in Kraftstoffen -
Wellenlängendispersive Röntgenfluoreszenz-Spektrometrie (ISO/DIS 20884:2018)
Produits pétroliers - Détermination de la teneur en soufre des carburants pour
automobiles - Spectrométrie de fluorescence de rayons X dispersive en longueur d'onde
(ISO/DIS 20884:2018)
Ta slovenski standard je istoveten z: prEN ISO 20884
ICS:
75.160.20 7HNRþDJRULYD Liquid fuels
oSIST prEN ISO 20884:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 20884:2018

---------------------- Page: 2 ----------------------
oSIST prEN ISO 20884:2018
DRAFT INTERNATIONAL STANDARD
ISO/DIS 20884
ISO/TC 28 Secretariat: NEN
Voting begins on: Voting terminates on:
2018-10-05 2018-12-28
Petroleum products — Determination of sulfur content
of automotive fuels — Wavelength-dispersive X-ray
fluorescence spectrometry
Produits pétroliers — Détermination de la teneur en soufre des carburants pour automobiles —
Spectrométrie de fluorescence de rayons X dispersive en longueur d'onde
ICS: 75.160.30; 75.080
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 20884:2018(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2018

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oSIST prEN ISO 20884:2018
ISO/DIS 20884:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST prEN ISO 20884:2018
ISO/DIS 20884:2018(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Sampling . 2
8 Calibration solutions . 3
8.1 Blank solution . 3
8.2 Stock solution . 3
8.3 Calibration solutions . 3
8.4 Storage and stability of the calibration solutions . 4
9 Settings . 4
9.1 Measuring parameters . 4
9.2 Optimization . 4
9.3 Performance check of the spectrometer . 4
10 Calibration . 4
10.1 General . 4
10.2 Calibration solutions . 5
10.3 Calibration curves . 5
10.4 Checking . 5
11 Procedure. 6
11.1 Samples with sulfur contents between 5 mg/kg and 60 mg/kg . 6
11.2 Samples with sulfur contents between 60 mg/kg and 500 mg/kg. 6
12 Expression of results . 6
13 Precision . 6
13.1 General . 6
13.2 Repeatability, r .6
13.3 Reproducibility, R .7
14 Test report . 7
Annex A (normative) Interferences and matrix effects . 8
Bibliography . 9
© ISO 2018 – All rights reserved iii

---------------------- Page: 5 ----------------------
oSIST prEN ISO 20884:2018
ISO/DIS 20884:2018(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing Documents is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates
closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical
standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 28, Petroleum and related products, fuels
and lubricants from natural or synthetic sources.
This third edition cancels and replaces the second edition (ISO 20884:2011), which has been technically
revised following a new interlaboratory study executed by CEN/TC 19/WG 27, Elemental analysis, that
confirmed the method precision. The main changes however compared to the previous edition are as
follows:
— the scope has been extended and now includes hydrotreated vegetable oil (HVO) and the synthetic
fuel Gas To Liquid (GTL);
— for instruments utilizing monochromatic excitation specific procedural steps have been included.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved

---------------------- Page: 6 ----------------------
oSIST prEN ISO 20884:2018
DRAFT INTERNATIONAL STANDARD ISO/DIS 20884:2018(E)
Petroleum products — Determination of sulfur content
of automotive fuels — Wavelength-dispersive X-ray
fluorescence spectrometry
WARNING — the use of this document may 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.
1 Scope
This document specifies a wavelength-dispersive X-ray fluorescence (WDXRF) test method for the
determination of the sulfur content of liquid, homogeneous automotive fuels from 5 mg/kg to 500 mg/
kg, which have a maximum oxygen content of 3,7 % (m/m). This product range covers diesel fuels
containing up to about 30 % (V/V) fatty acid methyl esters (FAME) and motor gasolines containing up
to about 10 % (V/V) ethanol, and synthetic fuels such as Hydrotreated Vegetable Oil (HVO) and Gas To
Liquid (GTL) having sulfur contents in the range of 5 mg/kg to 45 mg/kg.
NOTE 1 Sulfur contents higher than 500 mg/kg can be determined after sample dilution.
However, the precision was not established for diluted samples.
Products with higher oxygen content show significant matrix effects, e.g. FAME used as biodiesel.
Nevertheless, FAME may be analysed when the corresponding procedures are followed (see 5.3 and 8.1).
Other products may be analysed with this test method. However, precision data for products other than
those mentioned have not been established for this document.
NOTE 2 For the purposes of this document, the terms “% (m/m)” and “% (V/V)” are used to represent the mass
fraction, μ, and the volume fraction, φ, of a material respectively.
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.
ISO 3170, Petroleum liquids — Manual sampling
ISO 3171, Petroleum liquids — Automatic pipeline sampling
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
4 Principle
The sample under analysis is exposed in a sample cell to the primary radiation of an X-ray tube. The
count rates of the S K-L X-ray fluorescence and, where required, the count rate of the background
2,3
© ISO 2018 – All rights reserved 1

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oSIST prEN ISO 20884:2018
ISO/DIS 20884:2018(E)

radiation are measured. The sulfur content of the sample is determined from a calibration curve defined
for the relevant measuring range.
NOTE The IUPAC X-ray line notation (S K-L ) is used in this document; the corresponding Siegbahn X-ray
2,3
line notation (S-Kα) is being phased out.
5 Reagents
5.1 Dibutylsulfide, of nominal sulfur content 21,92 % (m/m), or dibutyldisulfide, of nominal sulfur
content 35,95 % (m/m), used as a calibrating substance for sulfur.
Care should be taken due to volatility (see Annex A).
5.2 White oil (paraffinum perliquidum), for use as a blank solution, of high purity grade, with a sulfur
content of less than 1 mg/kg. Check the blank solution prior to use with the spectrometer (6.1). A signal
for sulfur shall not be detectable.
5.3 Methyl oleate, for use as a blank solution when FAME is analysed, with a sulfur content of less
than 1 mg/kg. Check the blank solution prior to use with the spectrometer (6.1). A signal f
...