ISO INTERNATIONAL STANDARD 762 Second edition 2003-11-15 Fruit and vegetable products Determination of mineral impurities content Produits dérives des fruits et légumes - Détermination de la teneur en impuretesminéralesd'origineterreuse Reference number ISO 762:2003(E) ISO @ ISO 2003 ISO 762:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The Iso Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In @ ISO2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2003 - All rights reserved ISO 762:2003(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 technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnical committeehasbeen non-governmental, in liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the IsO/lEc 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 762 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 3, Fruit and vegetableproducts. This second edition cancels and replaces the first edition (isO 762:1982), which has been technically revised. ationrightsreserved ii Copvriaht International Oraanization for Standardizatior ISO 762:2003(E) INTERNATIONAL STANDARD Fruit and vegetable products Determination of mineral impurities content 1 Scope This international Standard specifies a method for the determination of the mineral impurities content (impurities generally originating from the soil) of fruit and vegetable products. 2 Principle Organic matter is separated by flotation and heavy impurities are separated by sedimentation. The sediment is incinerated at approximately 525 °C, and the residue obtained is weighed. 3 Apparatus Usual laboratory equipment and, in particular, the following. 3.1 Blender. 3.2 Beakers, of capacities 1 000 ml. 3.3 Filter paper, Whatman No. 411) or equivalent. 3.4 Incineration dishes, made of quartz, porcelain or platinum. 3.5 Muffle furnace, capable of being maintained at 525 °C ± 25 °C. 3.6 Desiccator, provided with an efficient desiccant. 3.7 Analytical balance, capable of weighing to the nearest 0,000 2 g. 3.8 Heater, gas