ISO INTERNATIONAL STANDARD 11048 First edition 1995-05-01 Soil quality Determination of water-soluble and acid-soluble sulfate Copyright Intermational Organization for Standardization Not for Resale ISO 11048:1995(E) Foreword IsO (the International Organization for Standardization) is a worldwide technical committees. Each member body interested in a subject for whicha technical committeehas beenestablishedhas theright tobe represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (lEC)onailmattersofelectrotechnicalstandardization. circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote. ISO/TC19o,Soilquality,SubcommitteeSC3,Chemicalmethodsandsoil characteristics. Annex A of this International Standard is for information only 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 International OrganizationforStandardization Case Postale 56· CH-1211 Geneve 20·Switzerland Printed in Switzerland ii Copyvightintematioal Organizatin for Standardization Not for Resale INTERNATIONAL STANDARD ISO ISO 11048:1995(E) Soil quality -- Determination of water-soluble and acid-soluble sulfate Section 1: General 1.1 Scope 1.2 Normative references The following standards contain provisions which, This International Standard specifies procedures for throughreferenceinthistext,constituteprovisions the preparation of water and acid extracts of air-dried of this International Standard. At the time of publi soils and soil-like materials. The sulfate content of cation, the editions indicated were valid. All standards these extracts is determined by a gravimetric method are subject to revision, and parties to agreements in which barium chloride is added to the water or acid based on this International Standard are encouraged extract and the precipitate of barium sulfate is dried to investigate the possibility of applying the most re- and weighed. The sulfate content is then calculated centeditionsofthestandardsindicatedbelow. from the mass of the material used in the analysis and Members of 1EC and ISO maintain registers of cur- the mass of barium sulfate precipitated. rently valid international Standards. This International Standard is applicable to all types Iso 3696:1987, Water for analytical laboratory use of air-dried soils, for example pretreated according to Specification and test methods. ISO 11464. Is0 9280:1990, Water quality Determination of This International Standard consists of seven sulfate - Gravimetric method using barium chloride. sections: ISO 11464:1994, Soil quality Pretreatment of sam- Section 1: General plesforphysico-chemicalanalyses. Section 2: Pretreatment of samples and determi- IS0 11465:1993. Soil quality - Determination of dry nation of dry matter contents matter and water content on a mass basis Gravimetric method. Section 3: Extraction of soil with water at a mass:volume ratio of 1 soil:5 water 1.3Principle Section4:Extraction of soil with water at a mass:volume ratio of 1 soil:2 water Samples of air-dried soil are extracted with: Section 5: Extraction of soil with dilute hydro - dilute hydrochloric acid; or chloric acid water in a mass:volume ratio of soil:water of 1:2 Section 6: Determination of sulfate in solution by or 1:5. a gravimetric method using barium chloride The sulfate content of these extracts is determined Section 7: Precision of method and test report by a gravimetric method in which barium chloride is Copyright International Organization for Standardization 1 g permitted without license from IHS Not for Resale