SIST EN ISO 4047:2000

SLOVENSKI STANDARD
01-februar-2000
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Leather - Determination of sulphated total ash and sulphated water-insoluble ash (ISO
4047:1977)
Leder - Bestimmung der sulfatierten Gesamtasche und der sulfatierten
wasserunlöslichen Asche (ISO 4047:1977)
Cuir - Dosage des cendres sulfatées totales et des cendres sulfatées insolubles dans
l'eau (ISO 4047:1977)
Ta slovenski standard je istoveten z: EN ISO 4047:1998
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL STANDARD.
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION‘~MEXAYHAPOAHAfl OPrAHM3AUMA I-IO CTAHAAPTM3AUMW~ORGANISATION INTERNATIONALE DE NORMALISATION
Leather - Determination of sulphated total ash and sulphated
water-insoluble ash
Cuir - Dosage des cendres sulfatees totales et des cendres sulfatkes insolubles dans l’eau
First edition - 1977-11-01
w
-
Ref. No. ISO 4047-1977 (E)
UDC 675 : 543.82
mineral matter, sulphating analysis.
Descriptors : leather, Chemical analysis, determination of content, ash,
Price based on 2 pages
FOREWORD
ISO (the International Organization for Standardization) is a worldwide federation
of national Standards institutes (ISO member bodies). The work of developing
International Standards is carried out through ISO technical committees. Every
member body interested in a subject for which a technical committee has been set
up 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.
Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the ISO Council.
International Standard ISO 4047 was developed by Technical Committee
ISO/TC 120, Leather, and was circulated to the member bodies in July 1976.
lt has been approved by the member bodies of the following countries :
Poland
Austral ia Hungary
Romania
Brazil India
South Africa, Rep. of
Canada Iran
Turkey
Chile Israel
Czechoslovakia I taly United Kingdom
Egypt, Arab Rep. of Mexico Yugoslavia
France Netherlands
Germany New Zealand
No member body expressed disapproval of the document.
This International Standard is based on method lUC/7 of the International Union
of Leather Technologists’ and Chemists’ Societies.
Standardkation,
0 International Organkation
Printed in Switzerland
INTERNATIONAL STANDARD ISO4047-1977 (E)
Leather - Determination of sulphated total ash and sulphated
watet=insoluble ash
0 INTRODUCTION 3 DEFINITIONS
For the purposes of this International Standard, the
The amount of mineral substances found by ashing leather
following definitions apply :
may differ from the actual content owing to decomposition,
reduction, or the escape by volatilization of certain salts.
3.1 sulphated total ash : The residue obtained from
By treating the ash with sulphuric acid, the salts and oxides
carbonized leather at 800 ‘C after sulphating the ash under
are converted into sulphates, but some salts will again be
the specif ied conditions.
transformed into oxides at the selected temperature of
ignition.
3.2 sulphated water-insoluble ash : The residue obtained
To determine the total mineral content, for example within when leather, previously extracted with water as specified
the framework of a complete leather analysis, the water- in ISO 4098, is carbonized after sulphating the ash under
soluble and water-insoluble inorganic substances tan be the specif ied conditions.
ascertained by calculation or determined separately.
Ammonium salts are not determined by this method
4 PRINCIPLE
(compare with ISO 4098).
Carbonization of the leather followed by treatment with
sulphuric acid and ashing in an open crucible.
1 SCOPE AND FIELD OF APPLICATION
This International Standard specifies a method for the
determination of the sulphated total ash and the sulphated
5 REAGENTS
watet--insoluble ash of leather.
During the analysis, use only reagents of recognized
The method is applicable to all types of leather.
analytical grade and only distilled water or water of
equivalent purity.
The determination may be inaccurate by the extent to
which the leather contains organo-metallic compounds,
5.1 Sulphuric acid, approximately 2 N Solution.
for example Silicone (see note 1 in 8.1).
5.2 Ammonium nitrate, approximately 100 g/l Solution.
2 REFERENCES
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