ISO-11048-1995.pdf
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1、INTERNATIONAL STANDARD IS0 11048 First edition 1995-05-01 Soil quality - Determination of water-soluble and acid-soluble sulfate Qualit6 du sol - Dosage du sulfate soluble dam I eau et dans I acide Copyright International Organization for Standardization Provided by IHS under license with ISO Licens
2、ee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:16:30 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 11048:1995(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 membe
3、r bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmenta
4、l and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the membe
5、r bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 11048 was prepared by Technical Committee lSO/TC 190, Soil quality, Subcommittee SC 3, Chemical methods and soil characteristics. Annex A o
6、f this International Standard is for information only. 0 IS0 1995 All rights reserved. Unless otherwrse specified, no part of this publicatron may be reproduced or utilized in any form or by any means, electronic or mechanical, rncludrng photocopying and microfilm, wrthout permission in writing from
7、 the publisher. lnternatronal Organrzatron for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed In Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04
8、/19/2007 06:16:30 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 11048:1995(EI Soil quality - Determination of water-soluble and acid-soluble sulfate Section 1: General 1.1 Scope 1.2 Normative references This International Standard specifie
9、s procedures for the preparation of water and acid extracts of air-dried soils and soil-like materials. The sulfate content of these extracts is determined by a gravimetric method in which barium chloride is added to the water or acid extract and the precipitate of barium sulfate is dried and weighe
10、d. The sulfate content is then calculated from the mass of the material used in the analysis and the mass of barium sulfate precipitated. The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cati
11、on, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain register
12、s of cur- rently valid International Standards. This International Standard is applicable to all types of air-dried soils, for example pretreated according to IS0 11464. IS0 3696:1987, Water for analytical laboratory use - Specification and rest methods. This International Standard consists of seven
13、 sections: IS0 9280:1990, Water quality - Determination of sulfate - Gravimetric method using barium chloride. Section 1: General IS0 11464:1994, Soil quality - Pretreatment of sam- p/es for physico-chemical analyses. Section 2: Pretreatment of samples and determi- nation of dry matter contents IS0
14、11465: 1993, Soil quality - Determination of dry matter and water content on a mass basis - Gravimerric method. Section 3: Extraction of soil with water at a mass:volume ratio of 1 soil:5 water Section 4: Extraction of soil with water at a mass:volume ratio of 1 soil:2 water 1.3 Principle Samples of
15、 air-dried soil are extracted with: Section 5: Extraction of soil with dilute hydro- chloric acid - dilute hydrochloric acid; or Section 6: Determination of sulfate in solution by a gravimetric method using barium chloride Section 7: Precision of method and test report - water in a mass:volume ratio
16、 of soil:water of I:2 or 1:5. The sulfate content of these extracts is determined by a gravimetric method in which barium chloride is 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19
17、/2007 06:16:30 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 11048:1995(E) Q IS0 added to the water or acid extract and the precipitate of barium sulfate is dried and weighed. The sulfate content is then calculated from the mass of soil used in the analysis and the ma
18、ss of barium sulfate pre- cipitated. Section 6 is similar to IS0 9280. It is recognized that other acceptable methods for the determination of sulfate are available but these are not covered by this International Standard. Suitable methods may include: direct barium titrimetry, induc- tively coupled
19、 plasma emission spectrometry, flow injection analysis using a turbidimetric method, con- tinuous flow indirect spectrophotometry using 2-aminoperimidine, air-segmented continuous flow calorimetry using methylthymol blue, and ion chro- matography. Reference should be made to the ap- propriate intern
20、ational and national standards for information regarding the applicability and limitations of such methods. 1.4 Applicability and limitations The procedures in sections 3 and 4 are considered to be relevant to the extraction of sulfate from soils and may be relevant to the assessment of the “availab
21、ility” of sulfate to plants (a variety of extractants have been used for this purpose and none were shown to be generally applicable to all soil types and climates). It should be noted that there is no ver- ified relation between water-extractable sulfate and the need for sulfur fertilization. The p
22、rocedure in sec- tion 4 is also relevant to the potential for the attack of sulfates on building materials, especially concrete. The use of the procedures described in sections 4, 5 and 6 should enable a distinction to be made between the presence of sulfates that are highly soluble in water and tho
23、se of limited solubility such as gypsum (CaS0,.2H,O). Section 6 is applicable to concentrations of sulfate ion (SO:-) in solution of 10 mg/l and above, i.e. in relation to the methods in sections 3 and 4 to minimum water-soluble concentrations in air-dried soil of about 50 mg/kg and 20 mg/kg 0,005 %
24、 (m/m) and 0,002 % (m/m) respectively and, in relation to the method in section 5, to a minimum acid-soluble con- centration in air-dried soil of about 500 mg/kg 0,05 % b?h?d. If concentrations in solution are lower than this, a concentration step will be required, or a more sensi- tive analytical p
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