2483 NTERNATIONAL STANDARD (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEKIYHAPOIHA OPIAHH3AIIM IO CTAHIAPTH3ALIWM-ORGANISATION INTERNATIONALE DE NORMALISATION Sodium chloride for industria! use --- Determination of the loss of mass at 110 °C First edition - 1973-01-15 uAN 10 1973 ISO 2483-1973 (E) UDC 661.833.321 : 543.71 Ref. No. ISO 2483-1973 (E) Descriptors: sodium chloride, chemical analysis, gravimetric analysis, moisture content. Price based on 2 pages Copyright International Organization for Standardization itted 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 deveioping International Standards is carried out through Iso Technical Committees. Every Member Body interested in a subject for which a Technicat 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 1SO2483 3 was drawn up by Technicai 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 Italy Spain Chile Korea, Dem.P.Rep. of Switzerland Morocco Thailand Czechoslovakia Egypt, Arab Rep. of Netherlands United Kingdom New Zealand U.S.S.R. France U.S.A. Germany Poland Hungary Portugal India Romania No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1973 Printedin Switzerland Copyright International Organization for Standardization Not for Resale INTERNATIONAL STANDARD ISO 2483-1973 (E) Sodium chloride for industrial use --- Determination of the loss of mass at 110 °C 1 SCOPE AND FIELD OF APPLICATION 5.2 Determination This international Standard specifies a method for the Control the temperature of the oven (3.2) at 110 ± 2 °c. In determination of the loss of mass at 110 °c (conventional the oven place the weighing bottle containing the test portion (5.1), its lid placed aslant, and a watch glass, the moisture) of sodium chloride for industrial use. diameter of which is slightly larger than that of the weighing bottle. After drying the salt, replace the lid with the watch 2 PRINCIPLE glass and place all in the desiccator (3.3). After cooling, close the weighing bottle with its lid and reweigh to the Drying in an oven at 110 ± 2 °c to constant mass. nearest 0,1 mg. Repeat the above procedure several times until the mass remains constant, i.e. until two consecutive weighings carried out at an interval of about 1 h do not 3 APPARATUS differ by more than 0,2 mg. Ordinary laboratory apparatus and 6 EXPRESSION OF RESULTS 3.1 Weighing bottle, squat type (approximate dimensions 50 mm in diameter and 25 mm high), with ground glass lid. 6.1 Method of calculation and formula 3.2 Electric oven, with natural draught, capable of being controlled at 110 ± 2 °c. mass, is given by the formula : NOTE - Check this temperature with a thermometer mounted so 100 that the bulb is in close proximity to the weighing bottle used (m, m²) × during a test. mo where 3.3 Desiccator, containing silica gel phosphorus pentoxide or a molecular sieve. mo is the mass, in grams, of the test portion; m, is the mass, in grams, of the weighing bottle 4 SAMPLING AND SAMPLES containing the test portion, with lid, before drying; For methods of sampling and the number of samples to be m2 is the mass, in grams, of the weighing bottle taken for a given quantity of product, the procedure containing the test portion, with ilid, after drying. specified in IsO ...1) shall be followed. 6.2 Repeatability and reproducibility Comparative analyses on two samples in