prEN ISO 20846

SLOVENSKI STANDARD
01-oktober-2025
Naftni in sorodni proizvodi - Določanje žvepla v gorivih za motorna vozila -
Ultravijolična fluorescenčna metoda (ISO/DIS 20846:2025)
Petroleum and related products - Determination of sulfur content of automotive fuels -
Ultraviolet fluorescence method (ISO/DIS 20846:2025)
Mineralölerzeugnisse - Bestimmung des Schwefelgehaltes von Kraftstoffen -
Ultraviolettfluoreszenz-Verfahren (ISO/DIS 20846:2025)
Produits pétroliers et connexes - Détermination de la teneur en soufre des carburants
pour automobiles - Méthode par fluorescence ultraviolette (ISO/DIS 20846:2025)
Ta slovenski standard je istoveten z: prEN ISO 20846
ICS:
75.160.20 Tekoča goriva Liquid fuels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 20846
ISO/TC 28
Petroleum and related products —
Secretariat: NEN
Determination of sulfur content
Voting begins on:
of automotive fuels — Ultraviolet
2025-08-26
fluorescence method
Voting terminates on:
ICS: 75.160.20; 75.160.30
2025-11-18
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
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Reference number
ISO/DIS 20846:2025(en)
DRAFT
ISO/DIS 20846:2025(en)
International
Standard
ISO/DIS 20846
ISO/TC 28
Petroleum and related products —
Secretariat: NEN
Determination of sulfur content
Voting begins on:
of automotive fuels — Ultraviolet
fluorescence method
Voting terminates on:
ICS: 75.160.20; 75.160.30
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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BE CONSIDERED IN THE LIGHT OF THEIR
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Published in Switzerland Reference number
ISO/DIS 20846:2025(en)
ii
ISO/DIS 20846:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
5 Reagents and materials . 2
6 Apparatus . 4
7 Sampling and sample handling . 5
8 Apparatus preparation . 5
9 Apparatus calibration and verification . 6
9.1 Multi-point calibration .6
9.2 One-point calibration .7
9.3 Verification . .8
10 Procedure . 8
11 Calculation . 9
11.1 Using multi-point calibration.9
11.2 Using one-point calibration .10
11.3 Calculation .10
12 Expression of results .10
13 Precision . 10
13.1 General .10
13.2 Repeatability,r .11
13.3 Reproducibility, R .11
14 Test report .11
Bibliography .13

iii
ISO/DIS 20846:2025(en)
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 fourth edition cancels and replaces the third edition (ISO 20846:2019).
The main changes compared to the previous edition are:
— the extension of the application scope to include higher blends of biodiesel (FAME) from 50 % up to neat
FAME (B100),
— next, further instructions regarding the (validity of the) multi-point calibration have been implemented.

iv
DRAFT International Standard ISO/DIS 20846:2025(en)
Petroleum and related products — Determination of sulfur
content of automotive fuels — Ultraviolet fluorescence method
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 an ultraviolet (UV) fluorescence test method for the determination of the sulfur
content of the following products:
— having sulfur contents in the range 3 mg/kg to 500 mg/kg,
— motor gasolines containing up to a mass fraction of 3,7 % (3,7 % (m/m) ) of oxygen [including those
blended with a volume fraction of ethanol up to about 10 % (10 % (V/V) )],
— diesel fuels, including those containing up to a volume fraction of about 50 % of fatty acid methyl
ester (FAME),
— having sulfur contents in the range of 3 mg/kg to 45 mg/kg,
— synthetic fuels, such as hydrotreated vegetable oil (HVO) and gas to liquid (GTL).
1)
— having sulfur contents in the range of 3 mg/kg to 30 mg/kg ,
— neat FAME (B100) and diesel fuels containing volume fraction of more than 50 % of FAME.
Other products (for example process feeds and effluents) can be analysed and other sulfur contents can be
determined according to this test method, however, no precision data for products other than automotive
fuels and for results outside the specified range have been established for this document. Halogens interfere
with this detection technique at concentrations above approximately 3 500 mg/kg.
NOTE 1 Some process catalysts used in petroleum and chemical refining can be poisoned when trace amounts of
sulfur-bearing materials are contained in the feedstocks.
NOTE 2 Nitrogen interference can occur, see 6.5 for further guidance.
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 1042, Laboratory glassware — One-mark volumetric flasks
ISO 3170, Hydrocarbon Liquids — Manual sampling
ISO 3171, Petroleum liquids — Automatic pipeline sampling
ISO 3675, Crude petroleum and liquid petroleum products — Laboratory determination of density —
Hydromete
...