8542 (ISO International Standard iNTERNATIONAL ORGANIZATION FOR STANDARDIZATIONOMEKAYHAPOAHAR OPrAHM3ALMA HO CTAHAAPTW3ALWW-ORGANISATION INTE RNATIONALE DE NORMALISATION Manganese and chromium ores - Experimental methods for evaluation of quality variation and methods for checking the precision of sampling Minerais de manganese et de chrome -- Methodes experimentales d'evaluation de la variation de qualite et methodes de controle de la fidelite de I'echantillonnage First edition -- 1986-11-15 UDC 553.32 : 553.46 : 620.113 Ref. No. ISO 8542-1986 (E) SO 8542-1986 Descriptors: minerals and ores, manganese ores, chromate minerals, quality audit, statistical quality control, sampling, rules of calculation. Price based on 9 pages right InternationalOrganizationfor Standardization Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing international Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental 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. They are approved in accordance with tSO procedures requiring at International Standard ISO 8542 was prepared by Technical Committee ISO/TC 65, Manganese and chromium ores. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. @ International Organization for Standardization, 1986 Printed in Switzerland itted without license from IHS Not for Resale ISO 8542-1986 (E) INTERNATIONAL STANDARD Manganese and chromium ores - Experimental methods for evaluation of quality variation and methods for checking the precision of sampling Scope and field of application 3.3 Determination of quality variation This International Standard specifies experimental methods for The quality variation shall be determined for each type of an ore the evaluation of quality variation of manganese and chromium specified between the parties concerned. ores, whether natural or processed, for the purpose of defining sampling procedure by the mass-basis systematic method and 3.4 Consignment for experiment the two-stage method as specified in the relevant international Standards. It also specifies methods for checking the precision It is recommended that consignments to be selected for the ex- of sampling by the mass-basis systematic method and two- perimental purposes be 3 000 t or over in mass and 50 or more stage method. increments constitute a gross sample. NOTE - The evaluation of quality variation for the sampling procedure by the time-basis systematic method shall be derived on the basis of 3.5 Methods for sampling and testing the mass-basis systematic method. The sampling, sample preparation, chemical analysis and related testing for experimental purposes shall be carried out in accordance with the relevant International Standards. 2 References Iso 4296/1, Manganese ores -- Sampling - Part 1: In- 3.6 Scale of experiment crement sampling. The experiment shall be conducted on a consignment basis and ISo 4296/2, Manganese ores - Sampling - Part 2: Prep- shall be repeated five times. For systematic sampling, an ex- aration of samples. periment shall cover either a whole consignment or part of the consignment. For two-stage sampling, it shall cover 10 wagons out of M wagons of a consignment. 3 Experimental methods for evaluation of 3.7 Frequency of experiment quality variation -- ( General conditions It is recommended that the experiment fo