SIST EN 12049:1999

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Feste Düngemittel und Calcium-/Magnesium-Bodenverbesserungsmittel - Bestimmung des Feuchtegehaltes - Gravimetrisches Verfahren durch Trocknung under reduziertem Druck (ISO 8189:1992 modifiziert)Engrais solides et amendements calciques et/ou magnésiens - Détermination de la teneur en eau - Méthode gravimétrique par séchage sous pression réduite (ISO 8189:1992 modifiée)Solid fertilizers and liming materials - Determination of moisture content - Gravimetric method by drying under reduced pressure (ISO 8189:1992 modified)65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 12049:1996SIST EN 12049:1999en01-marec-1999SIST EN 12049:1999SLOVENSKI
STANDARD



SIST EN 12049:1999



SIST EN 12049:1999



SIST EN 12049:1999



SIST EN 12049:1999



SIST EN 12049:1999



SIST EN 12049:1999



SIST EN 12049:1999



I NTERNATI ON AL STANDARD IS0 8189 First edition 1 992-1 1-01 Solid fertilizers - Determination of moisture content - Gravimetric method by drying under reduced pressure Engrais solides - Détermination de la teneur en eau - Méthode par séchage sous pression réduite Reference number IS0 81 89:1992(E) SIST EN 12049:1999



IS0 8 189: 1992( E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, governmental and non-governmental, in liaison with GO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 81 89 was prepared by Technical Committee ISO/TC 134, Fertilizers and soil conditioners, Sub-committee SC 4, Chemical analysis. Annex A of this International Standard is for information only. O IS0 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 CH-1 21 1 Genève 20 Switzerland Printed in Switzerland II SIST EN 12049:1999



IS0 8189:1992(E) INTERNATIONAL STANDARD Solid fertilizers - Determination of moisture content - Gravimetric method by drying under reduced pressure 01 Scope This International Standard specifies a gravimetric method, by drying under reduced pressure, for the determination of the moisture content of fertilizers. The method is not applicable to fertilizers and soil conditioners containing the following: - calcium nitrate; - calcium hydroxide; - calcium sulfate containing less than two molecules of water of crystallization for each molecule of calcium sulfate; - magnesium sulfate containing one or seven mol- ecules of water of crvstallization for each molecule of magnesium sulfaté; - salts which effloresce readilv at ambient temDera- a IS0 8358: 1991, Solid fertilizers - Preparation of samples for chemical and physical analysis. 3 Principle Drying a test portion at a pressure of 66 x IO3 Pa and a temperature of 25 OC for 24 h and determination of the resulting loss in mass. 4 Material 4.1 Silica gel desiccant, self-indicating, particle size 2 mm to 5 mm. Activate the silica gel, immediately prior to use, by placing about 100 g in the evaporating basin (5.4) and transferring the basin to the oven (5.51, set at 105 OC, for 2 h. Transfer the basin with its contents to a desiccator and allow to cool to ambient tem- perature. tures or those which absorb'water (desiccants). 5 Apparatus Ordinary laboratory apparatus and, in particular, the following. 5.1 Weighing bottle, 70 mm to 80 mm diameter, fitted with a stopper. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. A
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