ISO-1576-1988.pdf
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1、INTERNATIONAL STANDARD 1576 Second edition 1988-07-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXflYHAPOflHAR OPl-AHM3AuMR l-l0 CTAH,lJAPTM3AWl Tea - Determination of water-soluble ash and water-insoluble ash The - Determination des cendres soluble
2、s et des cendres insolubles dans leau ISO Reference number ISO 1576: 1988 (E ISO 1576 : 1988 (El Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bedies). The work of preparing International Standards is normally car
3、ried out through ISO technical committees. Esch 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 wor
4、k. ISO 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 approval before their acceptance as International Standar
5、ds by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 1576 was prepared by Technical Committee ISO/TC 34, Agricultural food products. This second edition cancels and replaces the first editi
6、on (ISO- 1576 : 1975), of which it constitutes a minor revision. 0 International Organkation for Standardization, 1988 Printed in Switzerland -,-,- INTERNATIONAL STANDARD ISO 1576 : 1988 (E) Tea - Determination of water-soluble ash and water-insoluble ash 1 Scope This International Standard specifie
7、s a method for the deter- mination of the water-soluble ash and the water-insoluble ash of tea. 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indi
8、cated were valid. All Standards are subject to revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the Standards listed below. Members of IEC and ISO maintain registers of currently valid Inter
9、national Standards. ISO 1572 : 1980, Tea - Preparation of ground Sample of known dry matter content. ISO 1575 : 1987, Tea - Determination o f total asb. 5 Apparatus Usual laboratory apparatus and, in particular, the following. 5.1 Dish, of 50 ml to 100 ml capacity, used for the deter- mination of to
10、tal ash. NOTE - lt is considered that silica dishes are unsuitable for use with this test. 5.2 Furnace, capable of being controlled at 525 OC + 25 OC. 5.3 Steam-bath. 5.4 Filter Paper, ashless. 5.5 Desiccator, containing an effective desiccant. 5.6 Analytical balance. 6 Procedure 3 Definitions 6.1 T
11、est Portion For the purposes of this International Standard, the following definitions apply. 31 water-soluble ash: The part of the total ash dissolved by water under the conditions specified in this International Standard. 32 water-insoluble ash: The part of the total ash remain- ing after treatmen
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