1、BRITISH STANDARD Fluid fertilizers - De-aeration of I I suspension samples by film disentrainment This European Standard EN IS0 10248:1999 has the status of a British Standard ICs 65.080 BS EN IS0 10248:ZOOO Incorporating Amendment No. 1 to (renumbers the BS as BS EN IS0 10248:2000) BS 5551 -2.11 :I
2、 997 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW - STDnBSI BS EN IS0 L02VB-ENGL 2000 W Lb2qbbS OB85VVV T30 Amd. No. 10995 BS EN IS0 10248:2000 Date Comments November Implementation of the European Standard 2000 This British Standard, having been prepared under the directio
3、n of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 March 1997 O BSI 11-2000 ISBN O 680 27218 4 National foreword This British Standard is the official English language version of EN IS0 10248:1999. It is identical w
4、ith IS0 10248:1996. The UK participation in its preparation was entrusted to Technical Committee CIV37, Fertilizers and related chemicals, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the interpretation, or
5、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 this committee can be obtained on request to its secretary. Cross-references The British Standards which implement
6、 these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence index”, or using the “Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary
7、 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, the EN IS0 title page, EN
8、IS0 foreword page, page 1 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication STD*BSI BS EN IS0 LOZYB-ENGL 2000 lb24bb7 0885445 777 EUROPEAN STANDARD ENISO 10248 NORME EUROPENNE EUROPMSCHE NORM May 199
9、9 ICs 65.080 English version Fluid fertilizers - De-aeration of supensions samples by film disentrainment (IS0 10248: 1996) Engrais liquides - Dsaration des chantillons de suspension par entranement en couche mince (IS0 10248:1996) (IS0 10248:1996) Flssige Dngemittel - Entlftung von Proben einer Sus
10、pension durch Bildung eines dnnen Films This European Standard was approved by CEN on 15 April 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up
11、-to-date lists and 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 und
12、er the responsibility 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 standard bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxe
13、mbourg, Netherlands, 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 1999 CEN All rights of exploitation in any form an
14、d by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 10248:1999 E STDmBSI BS EN IS0 LOZ48-ENGL 2000 Lb24bb7 088544b 803 EN IS0 10248:1999 Foreword The text of the International Standard from Technical Committee ISOPTC 134, Fertilizers and soil conditioners, of the Internationa
15、l Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CENPTC 260, Fertilizers and liming materials, the Secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an id
16、entical text or by endorsement, at the latest by November 1999, and conflicting national standards shall be withdrawn at the latest by November 1999. According to the CENXENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European
17、 Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swizerland and the United Kingdom. O BSI 11-2000 STD-BSI BS EN IS0 L0248-ENGL 2000 M Lb24bb7 0885447 74T EN IS0 10248:1999 1 Scop
18、e This International Standard specifies a procedure for the de-aeration of suspension samples for physical testing. The method is not suitable if the sample contains more than a trace of free ammonia, if there is permanent decomposition in the suspension, or if the sample is too viscous. 2 Principle
19、 Samples of suspensions may involve air being mixed in by stirring or shaking. Often this air diffuses out of the suspension very slowly because of the viscosity. To reduce the quantity of physically incorporated air, the suspension is subjected to a reduced pressure. To minimize the distances to be
20、 traversed by air bubbles emerging from the fluid, provision is made for thin-film disentrainment. Viscosity effects are reduced to a minimum when the fluid moves slowly. 3 Apparatus Normal laboratory apparatus and, in particular, the following items. 3.1 Rotary evaporator, with a minimum capacity o
21、f 1 litre, capable of evacuation to a pressure of 2 x 104 Pa. 3.2 Water bath, capable of being maintained at 25 “C f 2 “C. 4 Procedure Transfer about 500 g of the sample to a clean and dry 1 litre evaporator flask and weigh the flask and contents to the nearest 0,l g. Connect the flask containing th
22、e sample to the rotary evaporator (3.1). Set the speed of rotation at a minimum to create a thin film of suspension on the wall of the flask and to avoid mixing in more air. Place the body of the flask in the water bath (3.2) set at 25 “C NOTE 1 The cooling system of the evaporator should not be use
23、d, so as to avoid loss of water by temperature differences. NOTE 2 Higher temperatures should be avoided to prevent gas production by decomposition of fertilizer ingredients, for example urea. Reduce the pressure in the system to about 4 X 104 Pa. Operate the system for approximately 15 min. Gently
24、allow the system to come to atmospheric pressure before disconnecting the flask. Dry the outside of the flask and reweigh the flask and contents to the nearest 0,l g. NOTE 3 The loss in mass during the process should not exceed 0,1%. Take samples for physical testing with care. If the test is not to
25、 be performed immediately, close the flask and store under ambient conditions for no longer than 3 days. O BSI 11-2000 1 BS EN IS0 10248:2000 BSI 389 Chiswick High Road London w4 4AL STD*BSI BS EN IS0 LOZLi8-ENGL 2000 lb2Libb7 0885LiLi8 b8b = BSI - British Standards Institution BSI is the independen
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