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1、INTERNATIONAL STANDARD IS0 7837 Second edition 1992-07-01 Fertilizers - Determination of bulk density (loose) of fine-grained fertilizers Engrais - Ddtermination de /a masse volumique sans fassemenf des engrais fins Reference number IS0 7837:1992(E) Copyright International Organization for Standardi
2、zation Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:03:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7837:1992(E) Foreword IS0 (the International Organization for Standardization) is a worldwide
3、 federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that
4、committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by
5、 the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 7837 was prepared by Technical Committee ISO/TC 134, Fertilizers and soil conditione
6、rs, Sub-Committee SC 3, Physical properties. This second edition cancels and replaces the first edition (IS0 7837:1983), which has been technically revised. 0 IS0 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical
7、, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 0 CH-1211 Genkve 20 l Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license
8、with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:03:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7837:1992(E) Introduction A method for the determination of the bulk density (loose) of solid ferti- lizers having particle sizes
9、within the frequently encountered range from about 0.5 mm to 5 mm is specified in IS0 3944:1992, Fertilizers - Deter- mination of bulk density (loose). This method is not, however, suitable for hne-grained fertilizers having a large proportion of particles of di- ameters less than 0,5 mm. Such ferti
10、lizers 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 volume. The bulk density values obtained are, thus, too low. In the case of fine-grai
11、ned fertilizers, therefore, it is necessary to use a dust-tight, non-clogging apparatus, with a relatively wide measuring cylinder. . . . III Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale,
12、 04/27/2007 04:03:47 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 7837:1992(E) Fertilizers - Determination of bulk density (loose) of fine-grained fertilizers 1 Scope This International Standard specifies a method for the determination of the b
13、ulk 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
14、 is 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 standa
15、rds contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged
16、to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 7742:1988, Solid fertilizers - Reduction of sam- ples. IS0 8358:1991, So/id fertilizers - Preparation of
17、 samples for 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 bu
18、lk density (IooseJ is expressed in grams per cubic centimetre (g/cm ). 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
19、 cl. 5.2 Apparatus 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 lock- ing lever (5), for holding or loosening the hinged cover. The hinged cover is opened by manipulating
20、 the lever so that 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.). 5.2.2 Measuring cylinder (I), of capacit
21、y 1 000 cm3 + 5 cm3. 5.2.3 Intermediate piece (2) with hinged cover (3). 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:03:47 MDTNo reproduction or networking permitted wit
22、hout license from IHS -,-,- IS0 7837:1992(E) 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 IS0 8358, ensuring that the sample is sufficient to carry out two separate determinations. 7 Pr
23、ocedure 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 (5.2.3) from the measuring cylin- der (5.2.2). Scrape away the surplus fertilizer from the meas
24、uring 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 taken from the same test sample. 8 Expression of results 8.1 Method of calculation The bulk den
25、sity (loose), p, of the fertilizer, in grams per cubic centimetre, is given by the equation where m is the mass, in grams, of the test portion; V is the volume up to the brim, in cubic centimetres, of the measuring cylinder. Take as the result the arithmetic mean of the two determinations provided t
26、hat the requirement for repeatability (see 8.2) is satisfied. 8.2 Repeatability The difference between the results of two determi- nations, carried out in rapid succession by the same operator using the same apparatus, shall not exceed 0,02 g/cm3. 9 Test report The test report shall include the foll
27、owing particu- lars: 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 determi- nation; e) any operation not included in this International Standard or regarded as optional. 2 Copyright International
28、 Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:03:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7837:1992(E) 3 2 1 I a) Closed posltlon 1 Mensurlng cylinder lnter
29、naldlameter Internal helght 2 lntermedlate piece internal dlameter height 3 Hlngedcover 4 Fllllng device 5 r 4 d c 4- 3 2 1 l- d4 I dz Q dl ( I b) Open posltlon dl= f37mm*lmm /I, correspondlngto a capacity of1000cm35cm3 dz= 87mm*lmm h2=135mm*lmm lower Internal dlameter d3= 79mm*lmm upperlnternaldlam
30、eter dr= 99mm*lmm helght h3=199mm*lmm 5 Sprlng-suspendedlocklnglever Figure 1 - Apparatus for determination of bulk density (loose) of fine-grained fertilizers 3 , Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972
31、545001 Not for Resale, 04/27/2007 04:03:47 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 7837:1992(E) -_- _-_- UDC 631.8531.755.22 Descriptors: fertilizers, fines, tests, determination, bulk density, density measurement. Price based on 3 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:03:47 MDTNo reproduction or networking permitted without license from IHS -,-,-
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