1、STDOBSI BS EN 12747-ENGL 2000 = 1b24bb7 08b7443 O82 BRITISH STANDARD Liming materials - Determination of magnesium content - Atomic absorption spectrometric method The European Standard EN 129472000 has the status of a British Standard ICs 66.080 NO COPYING Wi“J3OuT BSI PERMISSION EXCEPT AS PEEMIlTE
2、D BY COPYBIGET LAW BS EN 12947:ZOOO National foreword AmdNo. Date This British Standard is the officiai English language version of EN 1294F2000. The UK participation in its preparation was enrusted to Technical Committee CII/37, Fertilizem and related chemicals, which has the responsibility to: com
3、ments - aid enquirem to understand the tee - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A list of organization
4、s represented on this committee can be obtained on request to its secretary. The United Kingdom voted against the acceptance of this standard at the CEN Formai Vote stage because the precision data quoted for this method is incomplete and highly suspect. Cross-references The British Standards which
5、implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled %ternational Standards Correspondence Indexm, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not pu
6、rport to include all the necessary provisions of a contract. Usem of British Standards are responsible for their correct applidon. 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 cov
7、er, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document waslastissued. This British Standard, having been prepared under the direction of the Sector Committee for Materiais and Chemicals, was publishe
8、d under the authority of the Standards Committee and comes into effect on 16 August ZOO0 ISBN O 580 35921 2 Amendments issued since publication STD*BSI BS EN L29Li7-ENGL 2000 = Lb24bb9 08b74q5 955 = EUROPEAN STANDARD EN 12947 NORME EUROPENNE EUROPISCHE NORM June 2000 ICs 65.080 English version Limin
9、g materials - Determination of magnesium content - Atomic absorption spectrometric method Amendements calciques eou magnsiens - Dbtermination de la teneur en magnsium - Mthode par spectromtrie dabsorption atomique Calcium-/Magnesium-Bodanverbesserungsmittel - Bestimmung des Magnesiumgehaltes - Atoma
10、bsorptionsspekrometrisches Vetfahren This European Standard was approved by CEN on 13 November 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this Europmn Standard the status of a national standard without any alteration. Up-
11、todate lists and bibliographical references concerning sich 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 tmslation under t
12、he responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembo
13、urg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPkEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretariat rue de Stassart, 36 8-1050 Brussels Q 2000 CEN All rights of exploitation in any form and by a
14、ny means reserved worldwide for CEN national Members. Ref. No. EN 12947:2000 E Page 2 EN 12947:2000 Contents Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Principle . 4 4 Reagents 4 5 Apparatus 5 7 Procedure 5 8 Expression of results . 6 9 Precision - . 7 10 Test report . 7 Bibliography . 8
15、6 Sampling 5 OBSI oa2000 - STD*BSI BS EN L2747-ENGL 2000 W Lb24bb9 08b7447 728 Page 3 EN 12947:2000 Foreword This European Standard has been prepared by Technical Committee CENTTC 260, Fertilizers and liming materials, the Secretariat of which is held by DIN. This European Standard shall be given th
16、e status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2000, and conflicting national standards shall be withdrawn at the latest by December 2000. According to the CENICENELEC Internal Regulations, the national standards organizations
17、 of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. QBSI 08-2000 - STD*BSI BS EN
18、L2947-ENGL 2000 D Lb24bb9 OBb7448 bb4 Page 4 EN 12947:2000 I Scope This European Standard specifies a method for the determination of the magnesium content of all liming materials by atomic absorption spectrometry. 2 Nonnative references This European Standard incorporates by dated or undated refere
19、nce, provisions from other publications. These normative references are cited at the appropriate places in the text, 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 incorpora
20、ted in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1482, Sampling of solid fertilizers and liming materials. IS0 331 0-1, Test sieves - Technical requirement and testing - Part I: Test sieves of metal wire c
21、loth. 3 Principle Dissolution of the test portion in diluted hydrochloric acid. Filtration and dilution. Determination of magnesium by flame atomic absorption spectrometry at a wavelength of 2852 nm. 4 Reagents 4.1 General Commercially available standard solutions may be used instead of standard sol
22、utions produced on-site in the laboratory. 4.2 Hydrochloric acid solution, diluted Dilute 500 ml of concentrated hydrochloric acid (pro = 1 ,I 8 g/ml) to I O00 ml with water. 4.3 Hydrochloric acid solution Approximately c(HCI) c 1 mol/l 4.4 Hydrochloric acid solution Approximately c(HCI) = 0,5 molA
23、4.5 Standard magnesium solution Containing 1,000 g of magnesium per litre. 4.5.1 hydrochloric acid solution (4.4) and dilute to the mark with the same solution. Weigh 1,013 g of magnesium sulfate (MgS04 7H20) into a 100 ml volumetric flask, dissolve in or 4.5.2 Heat magnesium oxide (MgO) at 600 “C f
24、or 2 h. Weigh 1,658 g of the freshly calcined MgO into a 500 ml beaker, dissolve in 100 ml of water and 120 ml of hydrochloric acid solution (4.3). Transfer quantitatively the solution to a 1 O00 ml volumetric flask, dilute to the mark with water and mix thoroughly. QBSI 08-2000 Page 5 EN 12947:2000
25、 4.6 Lanthanum solution, Containing 50 g lanthanum per litre. 4.6.1 Weigh 58,64 g lanthanum oxide (L%03) into a 600 ml beaker. Add 50 ml of water and carefully 250 ml of concentrated hydrochloric acid ro = 1 ,I8 glml). Stir, while cooling to room temperature. Transfer the solution quantitatively to
26、a 1 O00 ml volumetric flask, dilute to the mark with water and mix thoroughly. or; 4.6.2 Weigh 133,69 g of lanthanum chloride (Lach . 7H20) into a 600 ml beaker. Dissolve the salt in 500 ml of water under stirring. Transfer quantitatively to a 1 O00 ml volumetric flask, dilute to the mark with water
27、 and mix thoroughly. or 4.6.3 500 ml of water under stirring. Weigh 155,85 g of lanthanum nitrate (La(NC POV DI, D2, D, is the blank value, read off from the calibration graph for the blank solution; are the dilution factors m is the mass, of the test portion, in grams. The magnesium content express
28、ed as a mass fraction of MgO is obtained by dividing the above result by 0,6. 9 Precision 9.1 General The values derived from inter-laboratory tests. 9.2 Repeatability The absolute difference between two single results found on identical test materials by one operator using the same apparatus within
29、 the shortest feasible time interval will exceed the repeatability limit r in not more than 5 % of cases. The value is: r= 0,21 % 9.3 Reproducibility The absolute difference between two single test results on identical test material reported by two laboratories will exceed the reproducibility limit
30、R in not more than 5 % of the cases. The value is: R= 0,25 % 10 Test report The test report shall contain at least the following information: - all data necessary for the identification of the sample; - a reference to this European Standard; - the results and the units in which the results have been
31、 expressed; - any particular points observed in the course of the test; - any operations not specified in the method or regarded as optional which might have affected the results. OBSI 08-2000 STD*BSI BS EN 129ii7-ENGL 2000 M lb2rlbb9 OBb7r152 095 Page 8 EN 12947:2000 Bibliography VDLUFA, Manual II
32、of analysing methods for fertilizers. (VDLUFA-Verlag, Bismarckstrae 41 A, D-4293 Darmstadt). EC 77/535:1977, Council directive of 22.06.1977 on the approximation of laws in Member states regarding sampling and testing of fertilizers. OJEC no L 213/1 of 22.08.1977. QBSI 08-2000 BS EN 12947:2000 BSI 3
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