ISO INTERNATIONAL STANDARD 15685 Second edition 2012-07-15 Soil quality Determination of potential nitrification and inhibition of nitrification - Rapid test by ammonium oxidation Qualite du sol Determination de la nitrification potentielle et inhibition de la nitrification-Essai rapide par oxydation de I'ammonium Reference number ISO 15685:2012(E) ISO @ISO2012 Not for Resale ISO 15685:2012(E) COPYRiGHTPROTECTEDDOCUMENT ISO2012 All rights reserved. Unless otherwise specified, 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 permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2012 - All rights reserved No reproduction or networking permited withoutlicense from IHS Not for Resale ISO 15685:2012(E) Contents Page Foreword ..iv 1 Scope 2 Normative references 3 Terms and definitions. 4 Principle .2 5 Reagents 6 Apparatus, 3 7 Sampling, storage and characterization of samples 3 8 Procedure 8.1 Testing soils. 8.2 Testing the effect of chemicals. 8.3 Testing polluted soils. 8.4 Testing water extracts of biosolids 5 9 Calculations. 10 Test report ..5 Annex A (informative) Results of a laboratory ring test. AnnexB(informative)Micro-scalemeasurementofpotentialnitrificationrates .9 Bibliography 11 ili thout license from IHS Not for Resale