T99200.E06T5 3593-81 2 International Standard OSI 3593 w-85-66 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPTAHW3AUMA HO CTAHAAPTW3AUWMORGANISATION INTERNATIONALE DE NORMALISATION Starch -- Determination of ash Amidonsetfécules-Determinationdescendres Second edition -- 1981-10-01 ISO 3593-1981 (E) UDC 664.2:543.822 Ref.No.ISO3593-1981(E) Descriptors : starch, determination ofash. Pricebased on 2pages h 5T99200 E06T59h 3593-81 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 theisoCouncil. International Standard ISO3593was developed by Technical Committee iSO/TC 93, Starch (including derivatives and by-products). This second edition was submitted directly to the Iso Council, in accordance with clause 5.10.1 of part 1 of the Directives for the technical work of Iso. It cancels and replaces the first edition (i.e. 1so 3593-1976), which had been approved by the member bodies of the following countries : Chile Netherlands UnitedKingdom Czechoslovakia Poland USSR France Romania Yugoslavia Germany, F. R. Spain Iran Turkey The member bodies of the foliowing countries had expressed disapproval of the docu- ment on technical grounds : Australia USA ? JnternationalOrganizationforStandardization,19 ISO 3593-1981 (E) INTERNATIONALSTANDARD 48519030026616 6 Starch - Determination of ash 0 Introduction 5 Apparatus Native starches contain naturally small amounts of mineral Ordinary laboratory apparatus, and in particular : substances. Converted starches may additionally contain variable amounts of added mineral substances. 5.1Ashing dishes, of platinum or of any other material This International Standard specifies a procedure for the con- unaffected under the test conditions, with a flat base, a capac- ity of about 40 ml and a minimum usable surface area of ventional evaluation of both of these amounts together. 15 cm2. 1. Scopeandfieldofapplication 5.2 Desiccator, provided with a thick perforated metal plate, and containing an efficient desiccant such This International Standard specifies a method for the deter- phosphorus(V) oxide, silica gel impregnated with cobalt mination of the ash yielded by starches. chloride indicator, or granular anhydrous calcium sulphate similarly treated. Themethod is applicableto native starchesandto modified starches yieiding not more than 2 % of ash. It does not apply to 5.3 Electric furnace with ventilation, including a device hydrolysis products nor to oxidized starches, nor to other for control and adjustment of temperature to provide for in- products containing more than 0,2 % of chloride expressed as cineration at a temperature of 900 ± 25 oc. sodium chloride. In the other cases, use the method specified in ISO 5809.1) 5.4 Analytical balance. 2 Reference 5.5 Electrichot-plate orbunsenburner. ISo1666,Starch Determination of moisture content Oven-drying methods. 6Procedure Definition 6.1 Preparation of the dish For the purpose of this International Standard, the following definition applies : Clean the ashing dish (5.1), whether new or used, for example with boiling dilute hydrochloric acid, and rinse copiously with ash : The residue obtained after incineration of the product tap water and then with distilled water. under the conditions specified in this International Standard. Place the dish in the furnace (5.3) and heat for 30 min at The ash is expressed as a percentage by mass eith