BS-7755-3.5-1995 ISO-1464-1994.pdf
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1、BRITISH STANDARD BS 7755-3.5: 1995 ISO 11464: 1994 Soil quality Part 3: Chemical methods Section 3.5 Pretreatment of samples for physico-chemical analyses Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:36:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7755
2、-3.5:1995 This British Standard, having 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: Commi
3、ttee reference EPC/48 Draft for comment 92/51655 DC ISBN 0 580 23843 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPC/48, Soil quality, upon which the following bodies were represented: Association of Consulting Scie
4、ntists 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 Confederation of British Industry Department of Agriculture Northern Ireland Departm
5、ent of the Environment Department of the Environment (Drinking Water Inspectorate) Department of Trade and Industry Department of Trade and Industry (Laboratory of the Government Chemist) Institute of Groundsmanship Institute of Terrestrial Ecology Institution of Environmental Health Officers Instit
6、ution of Water and Environmental Management Macaulay Land Use Research Institute 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 st
7、andard, through subcommittees and panels: British Ceramic Research Ltd. 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 So
8、uth Bank University, Fri Dec 08 10:36:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7755-3.5:1995 BSI 03-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative reference1 3Principle1 4Apparatus1 5Procedure1 6Test report4 Annex A (informative) Examples
9、of apparatus5 Annex B (informative) Bibliography8 Figure 1 Diagram for sample pretreatment2 Figure A.1 Example of a mechanical soil crusher5 Figure A.2 Example of a mechanical sample divider6 Figure A.3 Example of a mechanical subsampler7 Figure A.4 Example of a mechanical mill7 Table A.1 Dimensions
10、 of a mechanical sample divider6 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:36:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7755-3.5:1995 ii BSI 03-1999 National foreword This Section of BS 7755 has been prepared u
11、nder the direction of the Health and Environment Sector Board. It is identical with ISO 11464:1994 Soil quality Pretreatment of samples for physico-chemical analyses, published by the International Organization for Standardization (ISO). ISO 11464 was prepared by Subcommittee 3, Chemical methods, of
12、 Technical Committee ISO/TC 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,
13、as follows. Part 1: Terminology and classification; Part 2: Sampling; Part 3: Chemical methods; Part 4: Biological methods; Part 5: Physical methods; Cross-reference The Technical Committee has reviewed the provisions of ISO 565:1990 to which normative reference is made in the text, and has decided
14、that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immuni
15、ty from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the a
16、mendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:36:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 11464:1994(E) BSI 03-19991 1 Scope This International Standard specifies the pretreatments required for soil samples
17、 that are to be subjected to physico-chemical analyses and describes the following five types of pretreatment of samples: drying, crushing, sieving, dividing and milling. The pretreatment procedures described in this International Standard are not applicable if they affect the results of the determi
18、nations to be made. In general, International Standards for analytical methods will state when it is necessary to adopt other procedures. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At t
19、he time of publication, the edition indicated was 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 recent edition of the standard indicated below. Members of IEC and ISO mai
20、ntain registers of currently valid International Standards. ISO 565:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. 3 Principle Soil samples are dried in the air, or in an oven at a temperature not exceeding 40 C, or freeze-dried (see 5.2
21、). If necessary, the soil sample is crushed while still damp and friable and again after drying (see 5.3). The soil is sieved (see 5.4) and the fraction smaller than 2 mm is divided into portions mechanically or by hand, to enable representative subsampling for analysis (see 5.5). If small subsample
22、s ( 2 g) are required for analysis, the size of the particles of the fraction smaller than 2 mm is further decreased (see 5.6). The necessary procedures are given in the flow diagram in Figure 1. NOTE 1A drying temperature of 40 C in an oven is preferable to air drying at room temperature because th
23、e increased speed of the drying limits changes due to microbial activity. NOTE 2It should be noted that every type of pretreatment will have an influence on several soil properties. NOTE 3Storing soil samples, including samples that are as received, air dried, refrigerated or stored in the absence o
24、f light, for a long time may have an influence on a number of soil parameters, especially solubilities of both inorganic and organic fractions. See 1. NOTE 4Special measures should usually be taken for samples from contaminated soils. It is important to avoid contact with the skin and special measur
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