1、STD*BSI BS EN L2CILiB-ENGL 1977 W Lb24bb7 ObZL31L BRITISH STANDARD Solid fertilizers and liming materials - Determination of moisture content - Gravimetric method by drying at (105 2) “C 737 m BS EN 12048 : 1997 * * m The European Standard EN 12048 : 1996 has the status of a British Standard ICs 66.
2、080 NO COPYING WITIIOIJT RSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-STD-BSI BS EN L2048-ENGL 1777 = lb24bb7 Ob21312 b73 Amd
3、. No. BS EN 12048 : 1997 Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technid Committee CIv37, Fertilizers and related chemicals, upon which the following bodies were represented: Association of Public Analysts British
4、Aggregate Construction Materials Inmes British Coal Corporation Chemical Industries Association Consumers Association Deparment of We and Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Horticultural Wes Association institute of lhding Standards Administrati
5、 on Mmistry of Agriculture, Fisheries and Food Water Services Association of England and Wales This British Standard, having been prepared under the direction of the Sector Board for Materiais and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 19
6、97 8 BSI 1997 Amendments issued since publication I I The foiiowing BSI references reiate to the work on this standard Committ+e reference CnB7 Draft for comment 91/52766 DC ISBN O 680 27410 1 I Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo r
7、eproduction or networking permitted without license from IHS-,- - - STD-BSI BS EN L20Li-ENGL 1777 Lb24bb7 Ob21313 50T BS EN 12048 : 1997 Contents Page Committees responsible Inside front cover Naiional foreword 11 Foreword 2 Method 1 Scope 3 2 Normative reference 3 3 Principle 3 4 Material 3 5 APP-
8、6 7 Procedure Preparation of the test sample 3 3 3 8 Expressionofresults 3 9 Testreport 3 Annexes A (informative) Precision 4 ZA (informative) Bibliography 4 * * rJ7 O BSI 1997 i Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or n
9、etworking permitted without license from IHS-,- STD.BS1 BS EN 12048-ENGL 1777 M 1b2Libb7 Ob213111 44b W BS EN 12048 : 1997 National foreword This British Standard has been prepared by Technical Committee CIV37 and is the Engiish ianguage version of EN 12048 : 1996 Solid f - ground rock phosphates; -
10、 partMy solubilized rock phosphates. - natural phosphates; The method is not applicable to hydrated or burnt lime, and to ammonium compounds or magnesium Sulfates. 6 Preparation of the test sample I Prepare the test sample, without grinding, in accordance with EN 1482. If nec-, quickly crush (not gr
11、ind) the material in a mortar. Mix ail the material and immediately take the test portion (7.1). NOTE 1. It is advisable to crush the matenal in an atmosphere of relative humiity 40 % to 60 %. 7 Procedure 7.1 Test portion Dry the weighmg bottle (6.1) in the oven (6.4), set at 105 OC, for 2 h. AUow t
12、o cool to ambient temperaime in a desiccaor. Weigh to the nearest 0,001 g about 10 g of the test sample into the tared weighing bottle. 7.2 Determination 2 Normative reference This European Standard incorporates by dated or undated reference, provisions from other publications. These normative refer
13、ences are cited at the appropriate places in the tat and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undakd references the la
14、test edition of the publication referred to applies. m EN 1482 : Sampling of solicl frizers and iming 4 4 I1996 maw 3 Principle Drying a test portion at (105 f 2) “C for 5 h and determination of the resulting loss in mass. 4 Material 4.1 Silica gel desiccant, self-indicaing, particle size 2 mm to 5
15、mm. Activate the silica gel, immediately prior to use, by placing about 100 g in the evaporating basin (6.3) and transferring the basin to the oven (6.4), set at 105 OC, for 2 h. T1.ansfer the basin with its contents to a desiccator and allow to cool to ambient temperature. Page 3 m12048:1996 Place
16、the unstoppered weighing bottle (6.1) containing the test portion, and the stopper, in the oven (6.4), set at 105 OC, for 5 h. lhnsfer the weighing bottle and the stopper to the desiccator (6.2) and ailow to cool to ambient temperature. Open the desiccator, quickly restopper the weighmg bottle and w
17、eigh the bottle and its contents to the nearest 0,001 g. 8 Expression of results The moisture content of the fertilizer or of the liming material, expressed as a percentage by mass, is given by the formula. mo mo-mi x 100 where: rr ml is the mass, in grams, of the test portion before drying; is the
18、mas, in grams, of the test poAon after drying. Round the result, the mean of at least two determinations, to 0,1% (mim). 9 Wst report The test report shall include the following information: , a) a reference to this European Standard I 5 Apparatus ordinary laboratory apparatus and, in particular, th
19、e 6.1 Weighing bottle, 70 mm to 80 mm diameter, fitted with a stopper. 6.2 Vacuum desiccaW, internai diameter b) the method of samphng and sample preparation; c) the results and the method of expression d, d) ail information necessary for the complete idenification of the sample; e) any unusual feat
20、ures noted during the determination; following. I l about 200 mm, containing silica gel desiccant (4.1) 6.3 Evaporating basin, intend diameter about 100 mm. f) any operation not included in this European Standard or in the European Standard to which reference is made, or regarded as optionai. 6.4 Ou
21、en, capable of being controlled at (105 f 2) “C. BSI 1997 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-STD.BSI BS EN L20Li8-ENGL 1997 = Lb24bb9 Ob21318 OL Page 4 EN12048:1996 An
22、nex A (informative) Precision Annex ZA (informative) I Bibliography I IS0 3963 : 1977 Ferti.Jim - Sampling from a A.l General The foilowing precision data were determined from an experiment conducted in 1982 involving 21 laboratories using one sample of each of the following fertilizers ammonium sui
23、fate; naturai phosphate; superphosphate 18 % (granuiar and also powdered). The method used employed the grinding and sieving of the sample whereas the published method involves crushing, and therefore these data are included for information only A.2 Repeatability The Merence between two single test
24、results obtained from identical test material by one analyst using the same apparatus within a short timeinted should exceed the repeatability limit, r, given by the following equation, on average not more than once in 20 cases in the normal and correct operation of the method where: conveyor by sto
25、pping the belt samples lots 7742 : 1988 sol.id - Reductio?z of IS0 8633 : 1992 Simple sampling method for smu r = 0,15 fi m is the arithmetic mean of the two test results (Le. two determinations). A.3 Reproducibility The difference between two single and independent test results found by two analyst
26、s working in different laboratories ushg identical test material should exceed the reproducibility limit, R, given by the following equation, on average not more than once in 20 cases in the nonnal and correct operation of the method where: R = 0,6 M is the arithmetic mean of the two test results (L
27、e. two determinations) O BSI 1997 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,- STD-BSI BS EN 12048-ENGL 1997 m 1b24bb9 Ob21319 T28 m BS EN 12048 : 1997 List of references See n
28、ationai foreword O BSI 1997 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-STD-BSI BS EN 1Z048-ENGL 1777 = 1b2Libb7 Ob21320 7LiT BS EN 12048 : 1997 BSI 389 Chiswick High Road Lond
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