BS-7755-3.2-1995 ISO-10390-1994.pdf
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1、BRITISH STANDARD BS 7755-3.2: 1995 ISO 10390: 1994 Soil quality Part 3: Chemical methods Section 3.2 Determination of pH Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:32:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7755-3.2:1995 This British Standard, h
2、aving been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1995 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference EPC/48 Draft for co
3、mment 92/52700 DC ISBN 0 580 23567 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Health and Environment Sector Board to Technical Committee EPC/48, upon which the following bodies were represented: Association of Consulting Scientist
4、s Association of County Councils Association of Environmental Consultants Association of Public Analysts British Gas plc British Geological Survey British Society of Soil Science Chemical Industries Association Department of Agriculture Northern Ireland Department of the Environment Department of th
5、e Environment (Drinking Water Inspectorate) Department of Trade and Industry (Laboratory of the Government Chemist) Institute of Groundsmanship Institute of Terrestrial Ecology Institution of Environmental Health Officers Institution of Water and Environmental Management Macaulay Land Use Research I
6、nstitute Ministry of Agriculture, Fisheries and Food Soil Survey and Land Research Centre Water Research Centre Water Services Association of England and Wales The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Ceramic Research Ltd.
7、Institute of Occupational Medicine National Rivers Authority Royal Society of Chemistry Society of Chemical Industry Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:32:20 GMT+00:00 2006, Uncontrolled Co
8、py, (c) BSI BS 7755-3.2:1995 BSI 03-1999i Contents Page Committees responsibleInside front cover National foreword ii 1Scope1 2Normative references1 3Principle1 4Reagents1 5Apparatus2 6Laboratory sample2 7Procedure2 8Repeatability and reproducibility2 9Test report3 Annex A (informative) Results of a
9、n interlaboratory trial for the determination of the pH of soils4 Table 1 Repeatability2 Table A.1 The results of the interlaboratory trial for the determination of the pH-H2O4 Table A.2 The results of the interlaboratory trial for the determination of the pH-KCl4 Table A.3 The results of the interl
10、aboratory trial for the determination of the pH-CaCl24 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:32:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7755-3.2:1995 ii BSI 03-1999 National foreword This Section of BS 77
11、55 has been prepared under the direction of the Health and Environment Sector Board. It is identical with ISO 10390:1994 Soil quality Determination of pH, published by the International Organization for Standardization (ISO) ISO 10390 was prepared by Subcommittee 3, Chemical methods, of Technical Co
12、mmittee 190, Soil quality, with the active participation and approval of the UK. BS 7755 is being published in a series of Parts subdivided into Sections and Subsections that will generally correspond to particular international standards. Other Parts of BS 7755 are, or will be, as follows: Part 1:
13、Terminology and classification; Part 2: Sampling; Part 3: Chemical methods; Part 4: Biological methods; Part 5: Physical methods. The Technical Committee has reviewed the provisions of the draft of ISO 11464, to which normative reference is made in the text, and has decided that they are acceptable
14、for use in conjunction with this standard. When ISO 11464 is published, it is intended to implement it as a British Standard. Textual error. When adopting the text of the international standard, the textual error given below was discovered. It has been marked in the text and has been reported to ISO
15、 with a proposal to amend the text of the international standard. In 5.3, note 6, line 1, “In soil systems” should read “In soil suspensions”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct appli
16、cation. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International standardCorresponding British Standard ISO 1770:1981BS 1704:1985 Specification for solid-stem general purpose thermometers (Identical) ISO 3696:1987BS 3978:1987 Specif
17、ication for water for laboratory use (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will
18、 be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:32:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 10390:1994(E) BSI 03-19991 1 Scope This International Standard specifies an instrumental metho
19、d for the routine determination of pH using a glass electrode in a 1 : 5 (V/V) suspension of soil in water (pH-H2O), in a solution of 1 mol/l potassium chloride (pH-KCl) or in a solution of 0,01 mol/l calcium chloride (pH-CaCl2). This International Standard is applicable to all types of air-dried so
20、il samples, for example pretreated according to ISO 11464. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are s
21、ubject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1770:1981,
22、 Solid-stem general purpose thermometers. ISO 3696:1987, Water for analytical laboratory use Specification and test methods. ISO 11464:1), Soil quality Pretreatment of samples for physico-chemical analyses. 3 Principle A suspension of soil is made up in five times its volume of one of the following:
23、 water; a 1 mol/l solution of potassium chloride (KCl) in water; a 0,01 mol/l solution of calcium chloride (CaCl2) in water. The pH of the suspension is measured using a pH-meter. NOTE 1To make the procedure generally applicable to all types of soil samples, a V/V shaking ratio is chosen because the
24、n all soils can be treated in the same way. If a m/V ratio were chosen, the weighed amount of test sample would have to be adapted for soils with a low density, to enable the preparation of the suspension. For the purpose of this International Standard, taking the required volume of test portion wit
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