EN ISO 8754:1995

SLOVENSKI STANDARD
01-maj-1998
1DIWQLSURL]YRGL'RORþHYDQMHåYHSOD0HWRGD]HQHUJLMVNRGLVSHU]LYQR
UHQWJHQVNRIOXRUHVFHQFR,62
Petroleum products - Determination of sulfur content - Energy-dispersive-X-ray
fluorescence method (ISO 8754:1992)
Mineralölerzeugnisse - Bestimmung des Schwefelgehaltes - Energiedispersives
Röntgenfluoreszenz-Verfahren (ISO 8754:1992)
Produits pétroliers - Détermination de la teneur en soufre - Méthode par fluorescence X
dispersive d'énergie (ISO 8754:1992)
Ta slovenski standard je istoveten z: EN ISO 8754:1995
ICS:
75.080 Naftni proizvodi na splošno Petroleum products in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
STANDARD
First edition
1992-05-O 1
Petroleum products - Determination of sulfur
content - Energy-dispersive X-ray fluorescence
method
/a teneur en soufre - AMthode
Produits p&troiiers - D&termination de
par fluorescence X dispersive d’bnergie
Reference number
ISO 8754: 1992(E)
IS0 8754:1992(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Inter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard IS0 8754 was prepared by Technical Committee
ISO/TC 28, Petroleum products and lubricants.
0 IS0 1992
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without
permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l Cl-i-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
INTERNATIONAL STANDARD IS0 8754:1992(E)
Petroleum products - Determination of sulfur content -
Energy-dispersive X-ray fluorescence method
4.1 Energy-dispersive X-ray fluorescence analyser:
1 Scope
any suitable model can be used, set up according to
the manufacturer’s instructions?
This International Standard specifies a method for
the determination of the sulfur content of hydro-
carbons such as naphthas, distillates, fuel oils, resi- 4.2 Analytical balance, accurate to 0,l mg.
dues, lubricating base oils only, unleaded gasolines
and components. The method is applicable to prod-
5 Procedure
ucts having sulfur contents in the range
0,Ol % (m/m) to 5 % (m/m).
5.1 Safety precautions
Samples containing heavy-metal additives, lead al-
kyls, etc., interfere with the method. Elements such
The X-ray equipment and manner of use shall com-
as silicon, phosphorus, calcium, potassium and hal-
ply with the regulations governing the use of
ides interfere if present in concentrations of more
ionizing radiation and/or recommendations of the
than a few hundred milligrams per kilogram.
International Commission on Radiological Pro-
tection. The radiation source shall be checked for
radiation leakage at intervals as required by the
2 Principle
regulations.
The sample is placed in the beam emitted from a
Servicing of the source shall only be carried out by
suitable low-energy radioactive source, for example
a fully trained and competent person using the cor-
55Fe source (typical radiation of 740 MBq). The re-
rect shielding techniques.
sultant excited characteristic X-radiation is meas-
ured and the accumulated count is compared with
At least one commonly used instrument has a
NOTE 1
counts from previously calibrated blends to obtain
thin beryllium window above the radioactive source. This
the sulfur concentration as a percentage by mass.
window is very fragile and is easily broken during cleaning
Three groups of calibration samples are required to of the sample area to remove oily residues.
span the concentration range 0,Ol % (m/m) to
5 % (m/m).
5.2 Sample cell preparation
The cells shall be thoroughly clean and dry before
3 Reagents
use. Handling of the film shall be kept to an absolute
minimum. The window shall be renewed for the
3.1 Di-n-butyl sulfide, sulfur content
measurement of each sample.
21,91 % (m}m)
NOTES
3.2 White oil, high-purity grade, containing less
2 Window material is usually 6 lirn polyester or
than 20 mg of sulfur per kilogram.
polycarbonate film. Normal commercially available poly-
ester window materi
...