1、BRITISH STANDARDBS EN 1235:1995Incorporating Amendment No. 1Solid fertilizers Test sievingThe European Standard EN 1235:1995, with the incorporation of amendment A1:2003, has the status of a British StandardICS 65.080g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54
2、g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 1235:1995This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Boar
3、d and comes into effect on 15 December 1995 BSI 26 September 2003The following BSI references relate to the work on this standard:Committee reference CII/37Draft for comment 94/503970 DCISBN 0 580 24904 2Committees responsible for this British StandardThe preparation of this British Standard was ent
4、rusted to Technical Committee CII/37, Fertilizers and related chemicals, upon which the following bodies were represented:Association of Public AnalystsBritish Aggregate Construction Materials IndustriesBritish Coal CorporationChemical Industries AssociationConsumers AssociationDepartment of Trade a
5、nd Industry (Laboratory of the Government Chemist)Fertiliser Manufacturers Association Ltd.Horticultural Trades AssociationInstitute of Trading Standards AdministrationMinistry of Agriculture, Fisheries and FoodWater Services Association of England and WalesAmendments issued since publicationAmd. No
6、. Date Comments14660 26 September 2003 See national forewordBS EN 1235:1995 BS 26 September 2003iContentsPageCommittees responsible Inside front coverNational foreword iiForeword 21 Scope and field of application 32 References 33 Definitions 34 Principle 35Aparatus 36 Sampling 37 Preparation of the
7、test portion 38 Procedure 49 Expression of results 410 Precision 511 Test report 5Annex ZA (informative) Expression of sieving test results 6Annex ZB (informative) Bibliography 11Table 1 Recommended charges for test sieving 4Table 2 Examples of precision data 5BS EN 1235:1995ii BS 26 September 2003N
8、ational forewordThis British Standard has been prepared by Technical Committee CII/37 and is the English language version of EN 1235:1995 Solid fertilizers Test sieving, including amendment A1:2003, published by the European Committee for Standardization (CEN). It supersedes BS 5551-3.5:1988, which
9、is now withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by !“.The CEN common modifications have been imp
10、lemented at the appropriate places in the text. The start and finish of each common modification is indicated in the text by tags . Where a common modification has been introduced by amendment, the tags carry the number of the amendment. For example, the common modifications introduced by CEN amendm
11、ent A11 are indicated by . It was derived by CEN from ISO 8397:1988 published by the International Organization for Standardization (ISO).Cross referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under
12、the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applica
13、tion.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 11 and a back cover.The BSI copyright notice displayed in this document indica
14、tes when the document was last issued.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 1235June 1995+ A1April 2003ICS 65.080Descriptors: Fertilizers, grain size analysis, sieve analysisEnglish versionSolid fertilizers Test sieving(includes amendment A1:2003)(ISO 8397:1988 modified)Engrais solides T
15、amisage de contrle(inclut lamendement A1:2003)(ISO 8397:1988 modifie)Feste Dngemittel Siebanalyse(enthlt nderung A1:2003)(ISO 8397:1988 modifiziert)This European Standard was approved by CEN on 1994-12-04; Amendment A1was approved by CEN on 2003-01-17. CEN members are bound to comply withthe CEN/CEN
16、ELEC Internal Regulations which stipulate the conditions forgiving this European Standard the status of a national standard without anyalteration.Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to anyCEN m
17、ember.This European Standard exists in three official versions (English, French,German). A version in any other language made by translation under theresponsibility of a CEN member into its own language and notified to theCentral Secretariat has the same status as the official versions.CEN members a
18、re the national standards bodies of Austria, Belgium,Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and United Kingdom.CENEuropean Committee for StandardizationComit Eur
19、open de NormalisationEuropisches Komitee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members.Ref. No. EN 1235:1995 + A1:2003 EEN 1235:1995 BS 26 September 20
20、032ForewordThe text of the International Standard from ISO/TC 134, Fertilizers and soil conditioners, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 260, Fertilizers and liming materials.This European Standard shal
21、l be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1995, and conflicting national standards shall be withdrawn at the latest by December 1995.According to the CEN/CENELEC International Regulations, the following count
22、ries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Endorsement noticeThe text of the International Standard ISO 8397:198
23、8 was approved by CEN as a European Standard with agreed common modifications as given below: the words “soil conditioners” are deleted in the title and scope; in the scope and field of application, two sentences have been added to introduce Annex ZA and Annex ZB; the normative references to Interna
24、tional Standards ISO 3963 and ISO 7410 have been deleted and the sampling method used has to be indicated in the test report; the dates of publication of the standards indicated in the normative references have been added; a note has been added to Table 1; an informative Annex ZA has been added with
25、 an example for the expression of sieving test results; an informative Annex ZB Bibliography has been added.Foreword to amendment A1This document (EN 1235:1995/A1:2003) has been prepared by Technical Committee CEN/TC 260, Fertilizers and liming materials, the Secretariat of which is held by DIN.This
26、 European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latest by October 2003.According to the CEN/CENELEC Internal Regulations, the
27、 national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switze
28、rland and the United Kingdom.EN 1235:1995 BS 26 September 200331 Scope and field of applicationThis International Standard specifies a method for the determination of the particle size distribution of solid fertilizers by test sieving.NOTE The applicability of the method has been tested with sieves
29、of nominal sizes of openings between 100 4m and 5,60 mm.Annex ZA gives !guidance on the interpretation of sieving test data“.Annex ZB lists the bibliography.2 ReferencesISO 565:1990, Test sieves Woven metal wire cloth, perforated plate and electroformed sheet Nominal sizes of openings.ISO 2395:1990,
30、 Test sieves and test sieving Vocabulary.ISO 2591:1988, Test sieving.ISO 3310-1:1990, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth.ISO 3944:1992, Fertilisers Determination of bulk density (loose)1).3 DefinitionsFor the purpose of this International Standard,
31、 the definitions of ISO 2395 apply.4 PrincipleDry sieving of a fertilizer sample with one or more test sieves using a mechanical sieving machine.5 Apparatus5.1 Balance, capable of weighing to the nearest 0,1 g.5.2 Stainless steel woven wire test sieves, 200 mm diameter, complying with ISO 3310-1, wi
32、th a lid and receiver for the sieves.5.3 Mechanical shaker (sieving machine), capable of imparting both horizontal and vertical motion to material inside a nest of sieves.5.4 Stopwatch.5.5 Soft brush.6 SamplingCarry out sampling by an appropriate method.7 Preparation of the test portionReduce the sa
33、mple (a method will form the subject of a future International Standard) to the quantity required for the sieving test. This quantity should be approximately that indicated in column 2 of Table 1 for the sieve corresponding to the dominant size fraction of the sample, provided that the size distribu
34、tion does not cause excess volume on any of the sieves in the set as indicated in column 3 of Table 1. 1)Technically identical with EN 1236.EN 1235:19954 BS 26 September 2003Table 1 Recommended charges for test sievingNOTE Recommended charge volumes for sieves from the supplementary list are found b
35、y interpolation.8 Procedure8.1 Select a maximum of seven test sieves from the range of principal sizes listed in ISO 565 to cover the range of particle size expected. Assemble the sieves in ascending order of aperture size on top of the receiver.NOTE Normally the principal sizes (R 20/3) should be u
36、sed. In special cases, however, it may be necessary to use supplementary sizes (R 20).8.2 Weigh the test portion to the nearest 0,1 g, place it on the top sieve and fit the cover.8.3 Place the assembled nest of sieves on the mechanical shaker and shake for 10 min.8.4 Remove the sieves from the nest
37、and weigh the quantity retained on each sieve and in the receiver to the nearest 0,1 g. Particles caught in the mesh of the sieve may be removed by brushing the reverse side of the sieve.8.5 Carry out at least two tests on separate test portions prepared from the same laboratory sample.9 Expression
38、of results9.1 Sum the masses of the fractions retained on the sieves and in the receiver.NOTE The sum of these masses should not differ by more than 1 % from the original mass of the test portion.9.2 Calculate each fraction mass as a percentage of the sum of these masses.Nominal aperture size Bulk v
39、olume of materialaRecommended volume of charge Maximum volume of residue permitted on the sieve at the completion of sievingcm3cm38,00 mm5,60 mm4,00 mm2,80 mm2,00 mm1,40 mm1,00 mm710 m500 m355 m250 m180 m50040035024020016014012010080706025020017512010080706050403530For non-friable and non-adhesive m
40、aterials only125 m90 m50402520aThe mass of material can be calculated by multiplying the volume by the bulk density, determined by the method described in ISO 3944, of the material to be sieved.EN 1235:1995 BS 26 September 2003510 PrecisionThe statistical information given here is only intended as a
41、 guideline to what can be expected. The values are based on the evaluation of collaborative studies which have been carried out using sieves of nominal sizes of openings between 100 4m and 5,60 mm.10.1 Repeatability, rThe difference |x1 x2| between two single results (x1and x2) found on identical te
42、st material by one operator using the same apparatus within the shortest feasible time interval will exceed the repeatability value r, expressed as a percentage, given by equation (1) and with a maximum value of 2,5 %, on average not more than once in 20 cases in the normal and correct operation of
43、the method. Both results should be considered suspect if the repeatability value r is exceeded. where is the mean value of the two results, expressed as a percentage by mass, of the fractions.10.2 Reproducibility, RSingle results (x1and x2) on identical test material reported by two laboratories wil
44、l differ by more than the reproducibility value R, expressed as a percentage, given by equation (2) and with a maximum value of 12,5 %, on average not more than once in 20 cases in the normal and correct operation of the method. Both results should be considered suspect if the reproducibility value
45、R is exceeded. where is as defined in 10.1.10.3 Examples (see Table 2)Table 2 Examples of precision data11 Test reportThe test report shall include the following information:a) the reference of the method used;b) all information necessary for the complete identification of the sample;c) the nominal
46、sizes of openings of the test sieves used;d) the mean values of the percentage by mass of material retained on each sieve;e) any operations not specified in this International Standard, or in the International Standards to which reference is made, or regarded as optional, together with any circumsta
47、nces likely to have affected the results;f) methods of sampling and sample preparation.NOTE Methods of recording results of test sieving in tabular form are shown in ISO 2591. . . (1). . . (2)rR For r For Rxminaxmaxbxminaxmaxb1491625360,511,522,52,5(2,5)57,51012,512,50,83,58,31523,834,81,34,59,81726
48、,337,301,55,31118,829,826,512,82131,342,3axminis the smaller of the two corresponding fractions x, expressed as a percentage by mass.bxmaxis the larger of the two corresponding fractions x, expressed as a percentage by mass.r 0,5 x=xR 2,5 x=xxEN 1235:19956 BS 26 September 2003Annex ZA (informative)!
49、Interpretation of sieving test dataZA.1 Determination of the size distributionIn the following, index sieve numbers n increase with increasing sieve aperture, and index0 refers to the receiver.The material retained on receiver, x0, and each of the individual sieves, xn, given as mass fraction in percent, can be obtained from equation (ZA.1):ZA.2 Definition of the cumulative undersizeThe cumulative undersize cn, given as mass fraction in percent, is defined by equation (ZA.2):ZA.3 Definition an
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