(ISO nternational Standard 5809 INTE RNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAR OPrAHW3AUMA nO CTAHAAPTW3AUWMGORGANISATION INTE RNATIONALE DE NORMALISATION Starches and derived products - Determination of sulphated ash Amidons, fecules et produits dérives -- Détermination des cendres sulfatées First edition - 1982-12-01 UDC 664.2 : 543.822 Ref. No. ISO 5809-1982 (E) iO 5809-1982 (E) Descriptors : starches, chemical analysis, determination of sulphated ash. Price based on 3 pages Copyright International Organization for Standardization ted without license from IHS Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing Inter- national Standards is carried out through ISO technical 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 5809 was developed by Technical Committee ISO/TC 93 Starch (including derivatives and by-products), and was circulated to the member bodies in February 1982 Austria Netherlands South Africa, Rep. of Egypt, Arab Rep. of Poland USA France Portugal USSR Germany, F.R. Romania No member body expressed disapproval of the document. International Organization for Standardization, 1982 Printed in Switzerland ited without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 5809-1982 (E) Starches and derived products -- Determination of sulphated ash 1 Scope and field of application 5.1 Sulphuric acid solution. This International Standard specifies a method for the deter. Add, carefully, 100 ml of concentrated sulphuric acid, mination of sulphated ash in starches and derived products. 020 1,83 g/ml, to 300 ml of water and mix. 5.2 Hydrochloric acid solution. 2 References Add, carefully, 100 m! of concentrated hydrochloric acid, ISO 1666, Starch Determination of moisture content 20 1,19 g/ml, to 500 ml of water and mix. Oven-drying methods. 1) ISo 1741, Dextrose -- Determination of loss in mass on drying 6 Apparatus - Vacuum oven method. Ordinary laboratory apparatus, and in particular ISo 1742, Glucose syrups -- Determination of dry matter Vacuum oven method. 6.1 Incineration dish, of platinum or any other material which does not deteriorate under the test conditions (for exam IsO 1743, Glucose syrup - Determination of dry matter ple a silica incineration dish),of capacity 100to200 ml and with Refractive index method. a minimum useful surface of 15 cm2. 6.2 Electric furnace with air circulation, capable of being 3 Definition controlled at 525 ± 25 °C. sulphated ash: The residue obtained after incineration of the 6.3 Electric hot-plate or gas burner or heating lamp. product, according to the method specified in this International Standard. 6.4 Desiccator, provided with an efficient desiccant. It is expressed as a percentage by mass either of the product as- 6.5 Water bath, capable of being controlled at 60 to 70 °C received or on the dry basis. 6.6 Analytical balance. 4Principle Incineration of a test portion, in the presence of sulphuric acid, 7 Procedure at a temperature of 525 ± 25 oc. 7.1 Preparation of the incineration dish The sulphuric acid facilitates the destruction of the organic matter and avoids losses by converting the volatile chlorides Clean the incineration dish (6.1), whether it is new or used, into non-volatile sulphates. with boiling hydrochloric acid solution (5.2), then rinse generously with water. Reagents Calcinate the incineration dish for 30 min in the furnace (6.2), controlled at 525 ± 25 C. Allow to cool to ambient Durin