ISO 8754:2025

International
Standard
ISO 8754
Third edition
Petroleum products —
Determination of sulfur content
— Energy-dispersive X-ray
fluorescence spectrometry
Produits pétroliers — Détermination de la teneur en soufre —
Spectrométrie de fluorescence de rayons X dispersive en énergie
PROOF/ÉPREUVE
Reference number
© ISO 2025
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents and materials . 1
6 Apparatus . 2
7 Sampling . 2
8 Apparatus preparation . 3
8.1 Analyser .3
8.2 Sample cups .3
9 Calibration . 3
9.1 General .3
9.2 Preparation of primary standards .3
9.3 Calibration standards .4
9.4 Storage of standards . .4
9.5 Calibration procedure .5
9.6 Checking .5
9.6.1 Short-term checking .5
9.6.2 Long-term checking .5
10 Procedure . 5
11 Calculation . 5
12 Expression of results . 5
13 Precision . 6
13.1 General .6
13.2 Repeatability, r.6
13.3 Reproducibility, R .6
14 Test report . 6
Annex A (informative) Matrix effects . 7
Bibliography . 9
PROOF/ÉPREUVE
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 19, Gaseous and liquid fuels, lubricants and related products of petroleum,
synthetic and biological origin, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 8754:2003), which has been technically
revised.
The main changes are as follows:
— the Scope has been expanded to biofuel and biofuel blends without precision statement;
— procedures for matrix corrections have been described in A.3;
— Clause 3 (Terms and definitions) has been added;
— Bibliography has been added.
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.
PROOF/ÉPREUVE
iv
Introduction
A specialized procedure, using the analytical technique described in this document, for automotive fuels
with sulfur contents below 0,20 % mass fraction, is covered by ISO 13032.
This test method can be used for biofuel or biofuel blends. The correction of matrix effects with regards to
oxygen content are described in A.3. Biofuel or biofuel blends were not tested during the determination of
the precision of the test method.
PROOF/ÉPREUVE
v
International Standard ISO 8754:2025(en)
Petroleum products — Determination of sulfur content —
Energy-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 method using energy-dispersive X-ray fluorescence spectrometry for the
determination of the sulfur content of petroleum products, such as naphthas, unleaded motor gasolines,
middle distillates, residual fuel oils, base lubricating oils and components. The method is applicable to
products with sulfur content in the range of a mass fraction of 0,03 % to a mass fraction of 5,00 %.
This test method can be used for biofuel or biofuel blends.
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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
The test portion is placed in the beam emitted from an X-ray source. The excitation energy may be derived
from a radioactive source, such as Fe, or from an X-ray tube. The resultant excited characteristic X radiation
is measured, and the accumulated count is compared with a calibration graph plotting counts against sulfur
content as a percentage by mass, on a series of calibration samples covering the range of sulfur contents
under examination.
5 Reagents and materials
5.1 White oil (light paraffin oil), of high purity grade, with a maximum sulfur content of 20 mg/kg.
For measurements at very low levels of sulfur content [below approximately a mass fraction of 0,1 %],
matrix effects are minimized if a diluent of a type similar to the product being analysed is used for the
PROOF/ÉPREUVE
production of the calibration standards described in Clause 9. Such a diluent should be of very low sulfur
content, preferably below 2 mg/kg.
5.2 Sulfur compounds, of k
...

ISO 8754:2025(en)
ISO/TC 28
Secretariat: NEN
Date: 2025-05-2106-17
Petroleum products — Determination of sulfur content — Energy-dispersive X-ray fluorescence
spectrometry
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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
© ISO 2025 – All rights reserved
ii
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents and materials . 1
6 Apparatus . 2
7 Samples and sampling . 3
8 Apparatus preparation . 3
8.1 Analyser. 3
8.2 Sample cups . 3
9 Calibration . 3
9.1 General. 3
9.2 Preparation of primary standards . 4
9.3 Calibration standards . 5
9.4 Storage of standards . 5
9.5 Calibration procedure . 5
9.6 Checking . 5
9.6.1 Short-term checking . 5
9.6.2 Long-term checking . 6
10 Procedure . 6
11 Calculation . 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 (informative) Matrix effects . 8
A.1 General. 8
A.2 Diluent selection . 8
A.3 Instrument-based matrix correction . 9
Bibliography . 11
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
© ISO 2025 – All rights reserved
iii
4 Principle . 1
5 Reagents and materials . 2
6 Apparatus . 2
7 Sampling . 3
8 Apparatus preparation . 3
8.1 Analyser. 3
8.2 Sample cups . 3
9 Calibration . 3
9.1 General. 3
9.2 Preparation of primary standards . 3
9.3 Calibration standards . 4
9.4 Storage of standards . 5
9.5 Calibration procedure . 5
9.6 Checking . 5
9.6.1 Short-term checking . 5
9.6.2 Long-term checking . 5
10 Procedure . 6
11 Calculation . 6
12 Expression of results . 6
13 Precision . 6
13.1 General. 6
13.2 Repeatability, r . 6
13.3 Reproducibility, R . 6
14 Test report . 7
Annex A (informative) Matrix effects. 8
Bibliography . 10

© ISO 2025 – All rights reserved
iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards 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 document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
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.htmlwww.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, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 19, Gaseous and liquid fuels, lubricants and related products of petroleum,
synthetic and biological origin, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 8754:2003), which has been technically
revised.
The main changes are as follows:
— the Scope has been expanded to biofuel an
...