1、STD-BSI BS EN IS0 7837-ENGL 2OOL .II Lb24bb9 0902042 41b 8 BRITISH STANDARD Fertilizers - Determination of bulk density (loose) of fine-grained fertilizers The European Standrd EN IS0 7837:2000 has the status of a British Standard UDC 631.8531.755.22 BS EN IS0 7837:ZOOl Incorporating Amendment No. 1
2、 to (renumbers the BS as BS EN IS0 7837:2001) BS 5551 -3.31 992 Il NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PEWIITED BY COPYRIGHT LAW 9 STD.BSI ES EN IS0 7837-ENGL 2003 Lbt4bb9 0902043 352 m BS EN IS0 7837:2001 Amd. No. Date Committees responsible for this British Standard Comments The preparatio
3、n of this British Standard was entrusted by the Chemicals Standards Policy Committee (CICL) to Technical Committee CIC/37, upon which the following bodies were represented: Association of Public Analysts British Aggregate Construction Materials Industries British Coal Corporation Chemical Industries
4、 Association Consumers Association Department of Trade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Horticultural Trades Association Institute of Trading Standards Administration Ministry of Agriculture, Fisheries and Food Ministry of Defence 13108 Im
5、plementation of the European Standard The following BSI references relate to the work on this standard Committee reference CICI37 Draft for comment 90/57361 DC ISBN O 580 21209 2 STD.DSI BS EN IS0 7837-ENGL 2001 9 Lb24bb9 0902044 299 BS EN IS0 7837:2001 Contents Page Committees responsible Inside fr
6、ont cover National foreword 11 Introduction 1 1 Scope 1 2 Normative references 1 3 Definition 1 4 Principle 1 5 Apparatus 1 6 Preparation of test sample 2 7 Procedure 2 8 Expression of results 2 9 Test report 2 of fine-grained fertilizers 3 Figure 1 - Apparatus for determination of bulk density (loo
7、se) i Q BSI 03-2001 National foreword This British Standard is the official English language vesion of EN IS0 7837:2000. It is identical with IS0 7837:1992. The UK participation in its preparation was entrusted to Technical Committee CIC/37, which has the responsiblity to: - - aid enquirers to under
8、stand the text; present to the responsible internationaVEurpoean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on t
9、his committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards whi
10、ch implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include a
11、ll 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 immunity from legal obligations. - Summary of pages This document comprises a front cover, an inside front cover, pages i
12、and ii, the EN IS0 title page, the EN IS0 foreword page, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. O BSI 03-2001 STD.BSI BS EN IS0 7837-ENGL 20OL 1624669 0902046 ob1 EUROPEAN STANDARD EN IS0 7837 NORME EUROPENNE EU
13、ROPISCHE NORM February 2000 ICs 65.080 English version Fertilizers - Determination of bulk density (loose) of fine-grained fertilizers (IS0 7837:1992) Engrais - Dtermination de la masse volumique sans tassement des engrais fins (IS0 7837:1992) (IS0 7837: 1992) Dngemittel - Bestimmung der Schttdichte
14、 feinkrniger Dngemittel This European Standard was approved by CEN on 3 January 2000. CEN members are bound to comply with the CENEENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists a
15、nd bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsib
16、lity of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherla
17、nds, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 2000 CEN All rights of exploitation in any form and by any means r
18、eserved worldwide for CEN national Members. Ref. No. EN IS0 7837:2000 E STD-BSI BS EN IS0 7837-ENGL 2003 m lb24bb7 0902047 TTB m EN IS0 7837:2000 Foreword The text of the International Standard from Technical Committee ISOPTC 134, Fertilizers and soil conditioners, of the International Organization
19、for Standardization (ISO) has been taken over as a European Standard by Technical Committee CENPTC 260, Fertilizers and liming materials, the Secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by
20、 endorsement, at the latest by August 2000, and conflicting national standards shall be withdrawn at the latest by August 2000. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Bel
21、gium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom O BSI 03-2001 STD.BSI BS EN IS0 7837-ENGL 2001 Lb24bb 0902048 934 m EN IS0 7837:2000 Introduction A method for the de
22、termination of the bulk density (loose) of solid fertilizers having particle sizes within the frequently encountered range from about 0,5 mm to 5 mm is specified in IS0 3944:1992, Fertilizers - Determination of bulk density (loose). This method is not, however, suitable for fine-grained fertilizers
23、having a large proportion of particles of diameters less than 0,5 mm. Such fertilizers pass with difficulty, in most cases, from the specified funnel into the measuring cylinder, generally cause considerable dust nuisance, and are inclined to form hollow spaces (air cavities) within their bulk volum
24、e. The bulk density values obtained are, thus, too low. In the case of fine-grained fertilizers, therefore, it is necessary to use a dust-tight, non-clogging apparatus, with a relatively wide measuring cylinder. 1 Scope This International Standard specifies a method for the determination of the bulk
25、 density (loose) of solid fine-grained fertilizers. The method is applicable to fertilizers which contain a large proportion of particles of diameters less than 0,5 mm. NOTE 1 For fertilizers which contain a large proportion of particles of diameters within the range from 0,5 mm to 5 mm, a method is
26、 specified in IS0 3944. The method is applicable to dry fertilizers only. If the fertilizer has absorbed moisture during transport or storage, it is necessary to dry it in an environmental chamber, with constant low humidity, prior to the determination. 2 Normative references The following standards
27、 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 subject to revision, and parties to agreements based on this International Standard are encouraged to inve
28、stigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 7742:1988, Solid fertilizers - Reduction of samples. IS0 8358:1991, Solid fertilizers - Preparation of samples for
29、chemical and physical analysis. 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 bulk density (loose) of a fertilizer the mass per volume of a material after it has been tipped freely into a container under specified conditions the bulk density (loo
30、se) is expressed in grams per cubic centimetre (g/cm3) 4 Principle Pouring of the fertilizer from a specified filling device into a specified measuring cylinder of known volume and weighing of the contents of the cylinder. 5 Apparatus 5.1 Balance, capable of weighing to the nearest 1 g. 5.2 Apparatu
31、s for determination of bulk density (loose), having the approximate dimensions given in Figure 1 and consisting of the following. 5.2.1 Filling device (4) with spring-suspended locking lever (5), for holding or loosening the hinged cover. The hinged cover is opened by manipulating the lever so that
32、the contents of the filling device discharge into the measuring cylinder. CAUTION - It is important that those parts of the apparatus which are in contact with the fertilizer are made of corrosion-resistant material (glass, plastics, etc.). 0 BSI 03-2001 1 STD.BSI BS EN IS0 7837-ENGL 2003 m Lb24669
33、0902049 870 EN IS0 7837:2000 5.2.2 Measuring cylinder (1), of capacity 1 O00 cm3 f 5 cm3. 5.2.3 Intermediate piece (2) with hinged cover (3) 5.3 Spatula, approximately 200 mm x 20 mm, or other suitable scraper. 6 Preparation of test sample Prepare the test sample by the methods given in IS0 7742 and
34、 IS0 8358, ensuring that the sample is sufficient to carry out two separate determinations. 7 Procedure Pour the fertilizer into the filling device (5.2.1) up to the brim. Open the hinged cover by manipulating the locking lever. After 2 min, remove the empty filling device and the intermediate piece
35、 (5.2.3) from the measuring cylinder (6.2.2). Scrape away the surplus fertilizer from the measuring cylinder using the spatula or other suitable tool (5.3). Weigh the contents of the measuring cylinder to the nearest 1 g. Carry out two determinations, in rapid succession, on separate test portions t
36、aken from the same test sample. 8 Expression of results 8.1 Method of calculation The bulk density (loose), p, of the fertilizer, in grams per cubic centimetre, is given by the equation m p=- V where m V is the mass, in grams, of the test portion; is the volume up to the brim, in cubic centimetres,
37、of the measuring cylinder. Take as the result the arithmetic mean of the two determinations provided that the requirement for repeatability (see 8.2) is satisfied. 8.2 Repeatability The difference between the results of two determinations, carried out in rapid succession by the same operator using t
38、he same apparatus, shall not exceed 0,02 g/cm3. 9 Test report The test report shall include the following particulars: a) identification of the sample; b) reference to the method used; c) the result and the method of expression; d) any unusual features noted during the determination; e) any operatio
39、n not included in this International Standard or regarded as optional. 2 O BSI 03-2001 STD.BSI BS EN IS0 7837-ENGL ZOnL 3624bb9 0902050 592 P. EN IS0 7837:2000 I 5 Sprlng-wcpendcd locklng lever 3 2 1 i 1 Figure 1 - Apparatus for determination of bulk density (loose) of fine-grained fertilizers 5 r C
40、 - c c- . Odr . 5 a) Closed posltlon 1 Mearurlng cyllnder Internal dlameter dr= e7m:imm Interno1 ticlght h, correspandtng to a capaclty of 1 000 cm * 5 cm 2 Intermedlate plecc Internal dlameter dz= B7mm*lmm height ht = 135 rnm 1 mm 3 Mngidcover 4 Fllilng devke lower Internal dlamRtsr d J= 79 mm 1 mm
41、 upper Internal dlameter d,= 99 m * 1 mm hlght hi= 199 mm * lmm bl Dpnp osltlon 8 BSI 03-2001 3 -8 BS EN IS0 7837:2001 BSI 389 Chiswick High Road London w4 4AL STD.BSI 6s EN IS0 7837-ENGL 2OOL Lb24bb9 0902053 429 m BSI - British Standards Institution BSI is the independent national body responsible
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