2461 NTERNATIONAL STANDARD TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIYHAPOAHA OPIAHH3ALIH HIO CTAHIAPTH3ALIHI .ORGANISATION INTERNATIONALE DE NORMALISATION Sodium chlorate for industrial use -- Determination of matter insoluble in water First edition 1973-04-01 APR-193 ISO 2461-1973 (E) Ref. No. 1SO 2461-1973 (E) UDC 661.833 : 322.5 : 541.8 Descriptors : sodium chlorate, chemical analysis, determination of content, solubility, insoluble matter. Price based on 2 pages Copyright International Organization for Standardization 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 international 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 2461 was drawn up by Technical Committee ISO/TC 47, Chemistry. It was approved in January 1972 by the Member Bodies of the following countries : Austria Ireland South Africa, Rep. of Belgium Israel Spain Chile Italy Sweden Czechoslovakia Korea, Dem.P.Rep. of Switzerland Egypt, Arab Rep. of Netherlands Thailand France New Zealand United Kingdom Germany Poland U.S.S.R. Hungary Portugal India Romania No Member Body expressed disapproval of the document. @ International Orgarnization for Standardization, 1973 Printed in Switzerland Copyright International Organization for Standardization INTERNATIONAL STANDARD ISO 2461-1973 (E) Sodium chlorate for industrial use -- Determination of matter insoluble in water 1SCOPE 5.3 Electric oven, capable of being controlled at 105 ± 2 °c. Check this temperature by means of a thermometer placed This International Standard specifies a method for the so that its bulb is close to the filter crucible used during the determination of matter insoluble in water, in sodium test. chlorate for industrial use. 6 PROCEDURE 2 FIELD OF APPLICATION The method is applicable to the analysis of products with a 6.1 Warning content greater than 0,01 % (m/m) of matter insoluble in Sodium chlorate induces combustion. Avoid storage or water. The method is not applicable to the analysis of handling close to a source of heat. Avoid all contact of the mixtures based on sodium chlorate, such as herbicides, salt or its solutions with combustible materials (clothes, insecticides, etc. wood, straw, rags, fatty substances, etc.) which are likely to catch fire or give rise to an explosive mixture. Wash copiously with water any materials accidentally impregnated 3 PRINCIPLE with sodium chlorate. Dissolution of a test portion in water. Filtration of the 6.2 Test portion resultant solution through a filter crucible. Washing, drying and weighing of the residue. Weigh, to the nearest 0,1 g, about 20 g of the test sample 6.3 Determination 4 REAGENT Weigh the filter crucible (5.2) after leaving it in the oven Distilled water, or water of equivalent purity, shall be used (5.3) controilled at 105 ± 2 °c for 30 min and cooling it in a in the test. desiccator. Transfer the test portion (6.2) to the conical flask (5.1), add 200 ml of water, insert the stopper and shake for 5 APPARATUS 10 min. Ordinary laboratory apparatus and Filter under vacuum through the filter crucible, previously weighed; wash the insoluble matter on the filter four times, 5.1 Conical flask, capacity 250 ml, with ground glass using 25 ml of water each time and taking care to suck the stopper. filter dry after each washing. 5.2 Filter crucibie, of sintered glass, of porosity grade P 40 (i.e. pore size between 16 and 40 μm). f