BS EN ISO 12782-2:2012 BSl Standards Publication Soil quality Parameters for geochemical modelling of leaching and speciation of constituents in soils and materials Part 2: Extraction of crystalline iron oxides and hydroxides with dithionite BSi raising standards worldwiderw BRITISH STANDARD BS EN ISO 12782-2:2012 Nationalforeword This British Standard is the UK implementation of EN ISO 12782-2:2012. The UK participation in its preparation was entrusted to Technical Committee EH/4, Soil quality. A list of organizations represented onthis committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @ The British Standards Institution 2012.Published by BSI Standards Limited2012 ISBN9780580669125 ICS 13.080.05 Compliancewitha BritishStandard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2012. Amendments issued since publication Date Text affected EN ISO 12782-2 EUROPEANSTANDARD NORMEEUROPEENNE EUROPAISCHENORM June 2012 ICS 13.080.05 English Version Soil quality - Parameters for geochemical modelling of leaching and speciation of constituents in soils and materials s-Part2 Extractionofcrystallineironoxidesandhydroxideswith dithionite (ISO 12782-2:2012) Qualite du sol - Parametres pour la modelisation Bodenbeschaffenheit -Parameter zur geochemischen geochimique de la lixiviation et de la speciation des Modellierung der Elution und Speziation von Bestandteilen constituants des sols et des materiaux - Partie 2: Extraction in Boden und Materialien - Teil 2: Extraktion von des oxydes et hydroxydes de fer cristallin avec le dithionite 2:2012) (ISO 12782-2:2012) This European Standard was approved by CEN on 31 May 2012. CEN members are bound to comply with the CEN/CENELEC Intemal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national This European Standard exists in three official versions (English, French, German). A version in any other language made by translation status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEENDE NORMALISATION EUROPAISCHES KOMITEEFUR NORMUNG Management Centre:AvenueMarnix 17,B-1000 Brussels 2012CEN All rights of exploitation in any form and by any means reserved Ref.No.EN ISO 12782-2:2012: E worldwide for CEN national Members. BSENISO 12782-2:2012 ENISO 12782-2:2012 (E) Foreword in collaboration with Technical Committee CEN/TC 345 "Characterization of soils” the secretariat of which is held by NEN. text or by endorsement, at the latest by December 2012, and conflicting national standards shall be withdrawn atthelatestbyDecember2012 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice Thetext of ISO12782-2:2012 has been approvedbyCEN as aENISO12782-2:2012 without any modification BS EN ISO 12782-2:2012 ISO 12782-2:2012(E) Contents Page Foreword Introduction 1 Scope. 2 Normativereferences. 3 Terms and definitions. 4 Principle. 5 Apparatus. 6 Reagents. 7 Sample pretreatment. 7.1 Sample size..... 7.2 Particlesizereduction 7.3 Det