ISO 1577:1980

International Standard @ 1577
INTFRNATlflNAI ORGANIZATION FOR STANDARDIZATION*ME~YHAPOnHAR OPrAHMBAUMR no CTAHAAPTM3AUMM*ORGANlSATlON INTERNATIONALE DE NORMALISATION
Tea - Determination of acid-insoluble ash
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Thé - Détermination des cendres insolubles dans l’acide
First edition - 1980-08-15
I
I- UDC 663.95: 543.8 Ref. No. IS0 1577-1980 (E)
1%
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Descriptors : agricultural products, tea, tests, determination of content, ashes
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Price based on 2 pages

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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
(IS0 member bodies). The work of developing Inter-
national standards institutes
national Standards is carried out through IS0 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
IS0 Council.
the
International Standard IS0 1577 was developed by Technical Committee ISO/TC 34,
Agricultural food products.
It was submitted directly to the IS0 Council, in accordance with clause 5.10.1 of part 1
ISO. It cancels and replaces IS0 Recommen-
of the Directives for the technical work of
dation R 1577-1970, which had been approved by the member bodies of the following
countries :
Australia Hungary South Africa, Rep. of
India Spain
Brazil
Canada Iran Thailand
Chile Israel Turkey
Korea, Rep. of United Kingdom
Colombia
Czechoslovakia Poland USSR
Egypt, Arab Rep. of Portugal
France Romania
The member bodies of the following countries had expressed disapproval of the docu-
ment on technical grounds :
Netherlands
Sri Lanka
U SA
O International Organization for Standardization, 1980 0
Printed in Switzerland

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IS0 1577-1980 (E)
INTERNATIONAL STANDARD
Tea - Determination of acid-insoluble ash
1 Scope and field of application 6 Apparatus
This International Standard specifies a method for the deter- Usual laboratory apparatus, and the following items :
mination of the acid-insoiuble ash from tea.
Dish, of capacity 50 to 100 ml, used for the determina-
6.1
tion of total ash.
2 References
6.2 Furnace, capable of being controlled at 525 f 25 OC.
IS0 1572, Tea - Preparation of ground sample of known dry
matter content.
6.3 Boiling water bath.
IS0 1575, Tea - Determination of total ash.
6.4 Filter paper, ashless.
3 Definition
6.5 Desiccator, containing an efficient desiccant.
For the purpose of this International Standard, the following
definition applies :
6.6 Analytical balance.
acid-insoluble ash : The part of the total ash, obtained in ac-
cordance with IS0 1575, remaining after treatment with
7 Procedure
hydrochloric acid solution under the conditions s
...