ISO 735 NTERNATIONALSTANDARD Oilseed residues - Determination of ash insoluble in hydrochloric acid Tourteaux de graines oleagineuses - Détermination des cendres insolubles dans I'acide chlorhydrique First edition -- 1977-10-01 Ref. No. ISO 735-1977 (E) SO 735-1977 (E) UDC 665.117 : 543.868 Descriptors : oilseeds, oilseed residues, chemical analysis, determination of content, ash, insoluble matter. Price based on 2 pages Copyright International Organization for Standardization ted without license from IHS Not for Resale FOREWORD ISO (the International Organization for Standardization) is a woridwide federation of national standards institutes (IsO member bodies). The work of developing International Standards is carried out through isO technicat 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 the ISO Council. International Standard iSO 735 was developed by Technical Committee ISO/TC 34, Agricultural food products. It was submitted directly to the ISO Council, in accordance with clause 6.12.1 of the Directives for the technical work of ISO. It cancels and replaces ISO Recommen- dation R 735-1968, which had been approved by the member bodies of the follow- ing countries : Hungary Portugal Australia Brazil India Romania Bulgaria Iran South Africa, Rep. of Czechoslovakia Israel Thailand Italy Turkey Chile Colombia Korea, Rep. of United Kingdom France Netherlands U.S.S.R. Germany Poland Yugoslavia The member body of the following country had expressed disapproval of the document on technical grounds : Canada @ International Organization for Standardization, 1977 Printed in Switzerland Copyvight Intenatioal Organizatin for Standardizatin ed without license from IHS Not for Resale ISO 735-1977 (E) INTERNATIONAL STANDARD Oilseed residues - Determination of ash insoluble in hydrochloric acid 1 SCOPE AND FIELD OF APPLICATION 6.5 Desiccator, containing an efficient desiccant. This International Standard specifies a method for the determination of the ash insoluble in hydrochloric acid, 7 PROCEDURE from residues (excluding compounded products) obtained by the extraction of oil from oilseeds by pressure or Make all weighings to the nearest 0,001 g. solvent. 7.1 Test portion and incineration 2 REFERENCES See 1SO 749. Iso 749, Oilseed residues -- Determination of total ash. 7.2 Determination Iso 771, Oilseed residues -- Determination of moisture and volatile matter content. Moisten the total ash obtained with 10 ml of the hydro- chloric acid solution (5.1), covering the incineration dish containing the ash with a watch-glass. Heat gently and, by 3 DEFINITION several washes with hydrochloric acid solution (5.1), using ash insoluble in hydrochloric acid : The fraction of the about 50 ml of acid solution in all and washing the watch total ash which remains undissolved after treatment with glass as well as the dish, transfer the contents of the dish hydrochloric acid under the operating conditions specified quantitatively to a beaker of about 250 ml capacity. Heat below. to boiling and keep gently boiling for about 10 min, then filter through hardened filter paper (6.3) and wash with boiling water until chloride ions are removed [test with the 4 PRINCIPLE silver nitrate solution (5.2)]. Treatment of the total ash with hydrochloric acid, to Place the filter paper and the residue in the incineration remove the portion soluble in this reagent, then inciner- dish (6.2), previously heated for 15 min in the furnace ation and weighing of the insoluble residue. (6.4) at 550 ± 15 °c, allowed to cool in the desiccator (6.5) to laboratory temperature and weighed. 5 REAGENTS