ISO 763:2003

SLOVENSKI STANDARD
SIST ISO 763:2011
01-junij-2011
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SIST ISO 763:1995
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Fruit and vegetable products -- Determination of ash insoluble in hydrochloric acid
Produits dérivés des fruits et légumes -- Détermination des cendres insolubles dans
l'acide chlorhydrique
Ta slovenski standard je istoveten z: ISO 763:2003
ICS:
67.080.01 Sadje, zelenjava in njuni Fruits, vegetables and
proizvodi na splošno derived products in general
SIST ISO 763:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 763:2011

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SIST ISO 763:2011


INTERNATIONAL ISO
STANDARD 763
Second edition
2003-12-01


Fruit and vegetable products —
Determination of ash insoluble in
hydrochloric acid
Produits dérivés des fruits et légumes — Détermination des cendres
insolubles dans l'acide chlorhydrique




Reference number
ISO 763:2003(E)
©
ISO 2003

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SIST ISO 763:2011
ISO 763:2003(E)
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ii © ISO 2003 — All rights reserved

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SIST ISO 763:2011
ISO 763:2003(E)
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
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International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 763 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 3, Fruit and
vegetable products.
This second edition cancels and replaces the first edition (ISO 763:1982), which has been technically revised.

© ISO 2003 — All rights reserved iii

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SIST ISO 763:2011

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SIST ISO 763:2011
INTERNATIONAL STANDARD ISO 763:2003(E)

Fruit and vegetable products — Determination of ash insoluble
in hydrochloric acid
1 Scope
This International Standard specifies a method for the determination of the hydrochloric-acid-insoluble ash
yielded by fruit and vegetable products.
The method serves for the determination of siliceous impurities, together with the silica endogenous to the
plant.
NOTE A method for the determination of mineral impurities generally originating from the soil is specified in
1)
ISO 762 .
2 Principle
A test portion is incinerated at approximately 525 °C and the mineral matter insoluble in dilute hydrochloric
acid is separated.
3 Reagents
Use only reagents of recognized analytical grade, unless otherwise specified, and distilled or demineralized
water or water of equivalent purity.
3.1 Hydrochloric acid, 10 % (by mass) solution.
3.2 Silver nitrate, approximately 17 g/l solution.
4 Apparatus
Usual laboratory apparatus and, in particular, the following.
4.1 Blender.
4.2 Muffle furnace, capable of being maintained at 525 °C ± 25 °C.
4.3 Boiling water bath.
4.4 Drying oven, capable of being maintained at 10
...