1、 STD-BSI BS EN 12047-ENGL 2977 E Lb24bb7 Ob21527 7bb BRITISH STANDARD Solid fertilizers and liming materials - Determination of moisture content - Gravimetric method by drying under reduced pressure BS EN 12049 : 1997 The European Standard EN 12049 : 1996 has the status of a British Standard ICs 65.
2、080 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD*BSI BS EN LZOLi9-ENGL 1777 W LbZLibb7 Ob21528 AT2 W Amd. No. Date BS EN 12049 : 1997 Text afected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Commit
3、tee CIIB7, Fertilizers and related chemicals, upon which the following bodies were represented: Association of Public Analysts British Aggregate Construction Materials Industries British Coal Copration Chemical IndWes Association Consumers Association Department of Thde and Industry (Laboratory of t
4、he Government Chemist) Fertiliser Manufacturers Association Ltd. Horticultural hades kssociaton Institute of ihding Standards Administrati on Minisq of Agriculture, Fisheries and Food Water Services Association of England and Wales This British Standard, having been prepared under the direction of t
5、he Sector Board for Materiais and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1997 Q BSI 1997 The following BSI references relate to the work on this standard Committee reference CW37 Draft for comment 91/52767 DC ISBN O 680 27411 X * v, * STD
6、-BSI BS EN 12047-ENGL 1777 lb24bb7 Ob21527 737 BS EN 12049 : 1997 Contents Committees responsible Page Inside hnt cover Nationai foreword ii Foreword 2 Method 1 Scope 2 Normative reference 3 Principle 4 Material 5 APP- 3 6 7 Procedure Preparation of the test sample 3 3 8 Expression of resuits 4 9 Te
7、streport 4 Annexes A (informative) Precision 5 ZA (informative) Bibliography 5 0 BSI 1997 i STD-BSI BS EN 12047-ENGL 1797 m Lb2Libb7 Ob2L530 q50 BS EN 12049 : 1997 National foreword This British Standard has been prepared by Technical Committee CIV37 and is the English language version of EN 12049 :
8、 1996 Sola fertilizers and liming ma- - Determination of moisture content - Gmvimetric method by dryiw under reduced pressure, published by the European Committee for standardization (CEN). It supersedes BS 5551 : Subsection 4.4.1 : 1993, which is withdrawn. EN 12049 was produced as a result of inte
9、rnational disucsion in which the United Kingdom took an active part. It was derived by CEN from IS0 8189 : 1992 published by the Intdod Organization for Standardization OSO). Cross-reference EN 1482 : 1996 Publication referred to Corresponding British Standard BS EN 1482 : 1996 Sampling of solid f -
10、 calcium hydroxide; - calcium suJfate containing less than two molecules of water of crystallization for each molecule of calcium sulfak; - magnesium sulfate containing one to seven molecules of water of crystallization for each molecule of magnesium sulate; - salb which effloresce readily at ambien
11、t temperatures or those which absorb water (desiccants). 2 Normative reference This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter.
12、For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard oniy when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies EN 1482 : Samping of solid frtizers and lim
13、ing I1996 ma- 3 Principle Drying a test portion at a pressure of 66 X 103 Pa and a temperature of 25 “C for 24 h and determination of the resulting loss in mass. 4 Matrial 4.1 Silica gel desiccant, self-indicating, particle size 2 mm to 5 mm. Activate the silica gel, immediately prior to use, by pia
14、ci about 100 g in the evaporating basin (6.4) and transferring the basin to the oven (6.6), set at 105 “C for 2 h. ?t.ansfer the basin with its contents to a desiccator and ailow to cool to ambient temperature. Page 3 EN 12049 : 1996 5 Apparatus Ordinary laboratory apparatus and, in particular, the
15、following: 6.1 Weighing bottle, 70 mm to 80 mm diameter, fim with a stopper. 6.2 Vacuum daiceator, internai diameter about 200 mm, containing silica gel desiccant (4.1). 6.3 Vacuum pump, fitted with a pressure gauge. 6.4 Evapomting basin, internai diameter about 100 mm. 6.6 Oven, capable of being co
16、ntrolled at (105 f 2) “C. 6 Preparation of test sample I Prepare the test sample, without grinding, in accordance with EN 1482. if necessary, quickly crush (not grind) the materiai in a mortar. Mix ail the material and immediaty take the test portion (7.1). NOTE 1. It is advisable to crush the mater
17、ial in an atmosphere of relative humidity 40 % to 60 %. 7 Procedure 7.1 Test portion Remove the stopper from the weighing bottle (6.1) and heat both for 2 h in the oven (6.6) set at 105 “C. Cool in the desiccator (6.2). After cooling to room temperature, fit the stopper and weigh to the nearest 0,00
18、1 g. Weigh, to the nearest 0,001 g, about 10 g of the test sample into the prepared weighing bottle, with the stopper placed alongside. 7.2 Determination Place the unstoppered weighing bottle (6.1) containing the test portion, and the stopper, adjacent to each other, in the desiccator (6.2) containj
19、ng the freshly activated silica gel (4.1). Using the vauum pump (6.3), reduce the pressure in the desiccator to an absolute pressure of (66 1,3) X 103 Pa (500 f 10) mmHg and maintain at this pressure for 24 h, at a temperature of (25 f 3) “C. Warning. Before use, it is essential to check that the va
20、cuum desiccator is free from defects. It should be placed behind a safety screen before applying a vacuum and should not be removed until atmospheric pressure has been restored. Mow the pressure inside the desiccator to return to that of the atmosphere by graduaily admitting air which has been dried
21、 by passage through the activated silica gel (4.1). Open the desiccator, quickly restopper the weighing bottle and weigh the bottle, stopper and contents to the neasest 0,001 g. O BSI 1997 STD-BSI BS EN L2049-ENGL 1997 Lb24bb9 Ob2L53Li OTb Page 4 ENl2049:1996 8 Expression of results The moisture con
22、tent of the fertilizer, expressed as a percentage by mass, is given by the formuh -mlxlOO mo where: is the mas, in grams, of the test portion before drying; is the mas, in grams of the test portion after drying. m1 Round the result, the mean of at least two determinations, to 0,1% (dm). 9 Tbst repor
23、t I The test report shall include the following infomation: a) a reference to this European Standara b) the method of sampling and sample preparation; c) the results and the method of expression used; d) all information necessary for the complete identification of the sample; e) any unusuai features
24、 noted during the determination; f) any operation not included in this European Standard or in the European Standard to which reference is made, or regarded as optionai. O BSI 1997 STD*BSI BS EN LZDiS-ENGL 1997 Lb2ibbS Gb21535 TI2 W Page 5 EN 12049 : 1996 Annex A (informative) Precision A.l General
25、The precision data were determined from an experiment conducted in 1979 involving 21 laboratories using one sample of each of five different types of fertilizer. Since it is not certain whether these data are valid for ail fertilizers to which this international standard applies, they are included f
26、or information om. A.2 Repeatability The difference between two singie test results obtained from identicai test material by one analyst using the same apparatus within a short time4nterva.l should exceed the repeatabiiw limit, r, given by the following equation, on average not more than once in 20
27、cases in the normal and correct operation of the method where: ?-= 0,l +i m is the arithmetic mean of the two test results - (i.e. two determinations). = - A.3 Reproducibility II II _I - - The difference between two single and independent test resuits found by two anaysts working in different - * *
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