ISO INTERNATIONAL STANDARD 18645 First edition 2016-03-15 Water soluble fertilizer General reguirements Matieres fertilisantesEngrais soluble dans I'eau-Exigences générales Reference number ISO 18645:2016(E) ISO International Organization for Standardization =ZHEJIANG INST OF STANDARDIZATION C15956617 @IS02016 vided by IHS under lic Not for Resale, 2016/6/2 08:35:26 itted without license from IHS IS0 18645:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+41 22 749 01 11 Fax +41227490947 copyright@iso.org www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZoISQ s.6 - All rights reserved I by IHS unde Not for Resale, 2016/6/2 08:35:26 etworking permitted without license from IHS IS0 18645:2016(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Requirement 4 Test method .3 4.1 Visual inspection for foreign matter. .3 4.2 Determination of nitrogen, phosphorus and potassium contents .3 4.3 Determination of calcium, magnesium and sulphur contents 3 4.4 Determination of molybdenum, boron and manganese, zinc, copper and iron contents.. 4 4.5 Determination of the chelated fraction of micro-nutrients. 4 4.6 Determination of the mass fraction of water insoluble matter .4 4.6.1 Principle 4 4.6.2 Reagents and materials 4 4.6.3 Apparatus... ..4 4.6.4 Ambient temperature controlled at (20 ± 10) °C 4 4.6.5 Test procedure. ..4 4.6.6 Calculation of the test result. .5 4.6.7 Tolerance .5 4.7 Determination of the pH value. .5 4.8 Determination of arsenic, cadmium, lead, chromium and mercury contents ..5 4.9 Determination of biuret content .5 4.10 Determination of mass fraction of chloride .5 5 Sampling and preparation of test sample .5 5.1 Sampling method .5 5.1.1 Products in bags .5 5.1.2 Products in bulk. .5 5.2 Reduction of samples .6 5.3 Test sample preparation 6 Marking and labelling ..6 Package, transport and storage .1 7 Bibliography ..8 iii ee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ensewithISO thout license from IHS Not for Resale, 2016/6/2 08:35:26