1、CEH EN*l23b 95 3404589 OLL5325 5T5 = BRITISH STANDARD Fertilizers - Determination of bulk density (loose) The European Standard EN 1236 : 1995 has the status of a British Standard ICs 65.080 BS EN 1236 : 1995 - CEN EN*L23b 95 3404589 OLL5326 431 BS EN 1236 : 1995 Committees responsible for this Brit
2、ish Standard The preparation of this British Standard was entrusted to Technical Committee CIv37, Fertilizers and related chemicals, upon which the following bodies were represented: Association of Public Analysts British Aggregate Construction Materials Industries British Coal Corporation Chemical
3、Industries Association Consumers Association Department of ?iade and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Horticulm Trades Association Institute of Ti.ading Standards Administrati on Ministry of Agriculture, Fisheries and Food Water Services Assoc
4、iation of England and Wales This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1995 O BSI 1995 Amendments issued since publication Amd.No* ID -
5、the bulk density (i-) is expressed in grams per cubic centimeire cg/cm3) in IS0 3944, in this European Standard it is expressed in kilograms per cubic metre wm3); - the normative references to intedonai standads Is0 7742 : 1988 and Is0 8358 : 1991 concerning methos of sampiing and sample preparation
6、 have been deleted and the method used has to be indicated in the test repoG - an informative annex ZA Bibliography has been added. The common modicaons have been inserted in the text of the reference document and are indicated by a vertid line in the margin. Introduction The bulk densities (loose a
7、nd tapped) of a fertilizer provide information relative to the required size of packaging materials, storehouses, stock-rooms, etc. Generally, the bulk density (tapped) is up to 10 % greater than the bulk density (ioose), and sometimes it may exceed this value. Both bulk densities depend on the actu
8、al density, surface form and particle size of the fertilizers. The bulk density (loose) can be used to calculate the maximum volume of a given weight of fertilizer which may be expected in practice. The actual volume occupied by a given weight of fertilizer will normally be withjn the range calculat
9、ed hm the bulk density (loose) and the bulk density (tapped). CEN EN*L23b 95 m 3404589 OLL5331 8T m Page 3 EN 1236:1995 Fertilizers - Determination of bulk density (loose) 1 Scope This International Standard specifies a method for the determination of the bulk density (loose) of solid fertilizers ex
10、cept powder fertilizers. The method is applicable to free-flowing fertilizers. The method is not suitable for materials which contain more than 20 % by mass of particles exceeding 5 mm in diameter. Annex ZA lists the bibliography. 2 Definition For the purposes of this International Standard, the rol
11、lowing definition applies. 2.1 bulk density (loose) of a fertilizer The mass per volume of a material tipped into a container and under clearly specified conditions. The bulk density loose IS expressed in kilograms per cubic metre (kgim s ). I 3 Principle Pouring of the fertilizer from a specified f
12、unnel into a specified measuring cylinder of known volume and weighing of the contents of the cylinder. 4 Apparatus 4.1 Balance, capable of weighing to the nearest 1 g. 4.2 Apparatus for determination of bulk density (loose), having the approximate dimensions given in figure 1 and consisting of the
13、following. 4.2.1 Removable measuring cylinder, without a spout. The capacity u to the brim shall be known to the nearest cubic centimetre. 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, e
14、tc.). 4.2.2 Firmly mounted funnel. 4.3 Spatula, approximately 120 mm x 20 mm, or other suitable scraper. 5 Preparation of test sample Prepare the test sample by appropriate methods, ensuring that the sample is sufficient to carry out two separate determinations. 6 Procedure Pour into the closed funn
15、el (4.2.2) a quantity of the fertilizer greater than that needed to fill the measuring cylinder (4.2.1). Fully open the slide of the funnel so that the contents discharge into the measuring cylinder in 6 s to 12 s. CEN ENa123b 95 3404589 OLL5332 735 = Page 4 EN 1236 : 1995 If the fertilizer does not
16、 flow freely, keep the outlet clear by inserting a rod of 3 mm to 4 mm diameter into the opening. When the cylinder overflows, close the slide of the funnel and scrape away the surplus fertilizer using the spatula or other suitable tool (4.3). Avoid vibration of the filled measuring cylinder. Remove
17、 the measuring cylinder from below the fun- nel and weigh its contents to the nearest 1 g of the total mass. Carry out two determinations, in rapid succession, on separate test portions taken from the same test sample. 7 Expression of results 7.1 Method of calculation The bulk density (loose), p, of
18、 the fertilizer, in I kilograms per cubic metre, is given by the equation m p=- V where m I is the mass, in kilograms, of the test portion; Take as the result the arithmetic mean of the two determinations provided that lhe requirement for repeatability (see 7.2) is satisfied. 7.2 Repeatability The d
19、ifference between the results of two determi- nations, carried out in rapid succession by the same operator using the same apparatus, shall not exceed 1 O kg/m3. I 8 Testreport The test report shall include the following particu- lars: a) identification of the sample; b) reference to the method used
20、: c) the result and the method of expression; d) any unusual features noted during the determi- na tion; e) any operation not included in this International Standard or regarded as optional; 9 method of sampling and sample preparation. I Y is the volume up to the brim, in cubic metres, of the measur
21、ing cylinder. I CEFI EN*L23b 75 3404587 OLL5333 b7L Page 5 EN 1236 : 1995 Dimensions (approximate) in millimetres I- 0 300 I I O 420 I Figure 1 - Apparatus for the determination of bulk density (loose) of fertilizers CEN ENs1236 95 3404589 OLL5334 508 = Page 6 EN 1236 : 1996 Annex ZA (informative) B
22、ibliography Iso3963: 1977 Iso 7410 : 1983 Iso7742: 1988 Iso8538: 1991 EN 1237 Pr EN 1482 Fertilkm - SamplingJm a convqor by stopping the belt Fertilkm and soil conditioners - Fd samples - Practical arrangements Solid fertilizers - Reduction of samples Solid fertizm - Preparation of samples for chern
23、ical and physical analysis Fertkm -Determination of W density (tapped) Sampling of solid fertizm - CEN ENr323b 95 W 3404589 0335335 Y44 BS EN 1236 : 1995 BSI 389 Chiswick High Road London w4 4AL 9512-U.35k- -FP BSI - British Standards Institution BSI is the independent national body responsible for
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