ISO INTERNATIONAL STANDARD 9289 First edition 1991-07-15 Oilseed residues -- Determination of free residual hexane Tourteaux de graines oleagineuses - Dosage de I'hexane residuaire libre Reference number ISO 9289:1991(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 9289:1991(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, govern- work. iso collaborates closely with the International Electrotechnica! Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IsO 9289 was prepared by Technical Committee ISO/TC 34, Agricultural food products. ISO 1991 or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland Copyright International Organization for Standardization Not for Resale d without license from IHS ISO 9289:1991(E) Introduction The amount of hexane which can be desorbed rapidly from an oilseed residue by heating is not necessarily equal to the total amount of re- sidual hexane determined in accordance with isO 8892:1987, Oilseed residues -- Determination of total residuai hexane. The "free residual hexane" is the amount of hexane desorbed by direct heating of the oilseed residue without a preceding humidification of the sample. The difference between the total residual hexane and the free residual hexane depends on severai factors. in general, it increases with de- creasing humidity of the oilseed residue examined, i.e. with increasing dryness of the oilseed residue. ili n or networking permited without license from IHS No reproductic Not for Resale