ISO 8819:1987
(Main)Liquified petroleum gases — Detection of hydrogen sulfide — Lead acetate method
Liquified petroleum gases — Detection of hydrogen sulfide — Lead acetate method
Gaz de pétrole liquéfiés — Détection de l'acide sulfhydrique — Méthode à l'acétate de plomb
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Standards Content (Sample)
IS0
INTERNATIONAL STANDARD
8819
First edition
1987-11-01
-
INTERNATIONAL ORGANIZATION FOR STANDARC ATION
ORGANISATION INTERNATIONALE DE NORMAL
ATION
MEXAYHAPOAHAR OPTAHH3AuMR il0 CTAHAAPl IAUMM
-
n
Liquefied petroleum gases - Detection of hydrog
sulfide - Lead acetate method
lomb
Gaz de pétrole liquéfiés - Détection de l'acide sulfhydrique - Méthode à l'acétate dt
Reference number
IS0 8819: 1987 (E)
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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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 8819 was prepared by Technical Committee ISO/TC 28,
Petroleum products and lubricants.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless othetwise stated.
O International Organization for Standardization, 1987
Printed in Switzerland
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I
INTERNATIONAL STANDARD l IS0 8819 : 1987 (E)
Liquefied petroleum gases - Detection of pydrogen
sulfide - Lead acetate method
1 Scope and field of application
3.2 Lead acetate test pq$er. Prepare the test paper by dip-
ping strips of smooth filter paper into an aqueous 50 g/l solu-
tion of lead acetate, withdraw the strips and remove excess
This International Standard specifies a method for the detec-
solution from them with CI e an filter paper.
tion of hydrogen sulfide in liquefied petroleum gases.
Commercially available tes4 papers may be used as an alter-
The lower limit of detectability is 4 mg of hydrogen sulfide in
native, if they are of a type That has been shown to give similar
1 m3 of liquefied petroleum gas. Methyl mercaptan, if present,
results to papers prepared 6s above.
produces a transitory yellow stain on the lead acetate paper
which, however, fades completely in less than 5 min. Other
sulfur compounds present in liquefied petroleum gas do not
interfere with the test.
paratus.
NOTE - Liquefied petroleum gases and the products of their combus-
tion should not be unduly corrosive or reactive to materials with which
they come into contact. It is therefore important that the presence of
3.3 Flow indicator. A wet test meter or a variable area flow-
any hydrogen sulfide should be detected. Additionally, the odour of
meter, which measures gais flow rates in the range of 2 to
hydrogen sulfide is unacceptable in some applications of liquefied
I
3 I/min.
petroleum gases (e.g. lighter fuel).
4 Sampling I l
2 Principle
Because of the chemical ac ivity and physical adsorptive prop-
erties of hydrogen sulfide, 1 t is highly desirable to connect the
The vaporized sample is passed over moist lead acetate paper
test apparatus directly to the sample source and perform the
under controlled conditions. Hydrogen sulfide reacts with lead
test on the spot, rather tha transferring sample into a sample
acetate to form lead sulfide and thus produces a coloration on
cylinder for testing in the I k boratory.
the paper which will vary from yellow to black
...
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