ISO INTERNATIONAL STANDARD 19670 First edition 2017-03 Fertilizers and soil conditioners Solid urea aldehyde slow release fertilizer General requirements Engrais et amendements -Engrais uree aldehyde solide a libération lente-Exigences générales Reference number ISO19670:2017(E) International Organizatiorifor Standardization @ IS0 2017 ZHEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS IS0 19670:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS02017,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. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intenationaibr Prganization for Standardization icensee-ZHEJIANG INST OF STANDARDIZRoISQ s1.7 - All rights reserved Not for Resale, 2017/5/11 01:59:06 etworking permitted without license from IHS IS0 19670:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. 2 Normative references 3 Terms and definitions 4 Requirements ..2 4.1 Visual inspection .2 4.2 Requirement of solid urea aldehyde slow release fertilizer .2 5 Analytical methods. .3 5.1 Determination of the appearance .3 5.2 Determination of the mass fraction of total nitrogen .3 5.3 Determination of the mass fraction of ureic nitrogen. .3 5.4 Determination of the mass fraction of CWIN .3 5.4.1 Principle 3 5.4.2 Reagents. .3 5.4.3 Apparatus. 3 5.4.4 Procedure 4 5.4.5 Expression of results. 4 5.5 Determination of the mass fraction of HWIN and AI .4 5.5.1 Principle. 5.5.2 Reagents. 4 5.5.3 Apparatus. 5.5.4 Procedure .5 5.5.5 Expression of results 5.6 Determination of the mass fraction of nitrogen from IBDU and CDU .6 6 Sampling and preparation of test sample .6 6.1 Sampling method ..6 6.1.1 Products in bags .6 6.1.2 Products in bulk. .6 6.2 Reduction of samples .6 6.3 Test sample preparation .6 7 Marking and labelling ..7 8 Packaging, transport and storage 7 Bibliography .8 iii ee=ZHEJIANG INSTOFSTANDARDIZATION C15956617 d without license from IHS Not for Resale, 2017/5/11 01:59:06