DD-CEN-TS-15478-2006.pdf
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1、DRAFT FOR DEVELOPMENT DD CEN/TS 15478:2006 Fertilizers Determination of total nitrogen in urea ICS 65.080 ? Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:41:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD CEN/TS 15478:2006 This Draft for Development was pu
2、blished under the authority of the Standards Policy and Strategy Committee on 29 December 2006 BSI 2006 ISBN 0 580 49798 4 National foreword This Draft for Development was published by BSI. It is the UK implementation of CEN/TS 15478:2006. This publication is not to be regarded as a British Standard
3、. It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and experience of its practical application can be obtained. Comments arising from the use of this Draft for Development are re
4、quested so that UK experience can be reported to the European organization responsible for its conversion to a European standard. A review of this publication will be initiated not later than 3 years after its publication by the European organization so that a decision can be taken on its status. No
5、tification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards. According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to exten
6、d the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, London W4 4AL. The UK participation in its preparation was entrusted to Technical Committee CII/37, Fer
7、tilisers and related chemicals. A list of organizations represented on CII/37 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Amendments issued since publication A
8、md. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:41:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 15478 September 2006 ICS 65.080 English Version Fertilizers -
9、Determination of total nitrogen in urea Engrais - Dtermination de lazote total dans lureDngemittel - Bestimmung von Gesamtstickstoff in Harnstoff This Technical Specification (CEN/TS) was approved by CEN on 24 June 2006 for provisional application. The period of validity of this CEN/TS is limited in
10、itially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard. CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make
11、 the CEN/TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached. CEN members are the national standards bo
12、dies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN CO
13、MMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 15478:2006: E Licensed Copy: L
14、ondon South Bank University, London South Bank University, Sun Dec 24 04:41:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 Contents Page Foreword3 1 Scope 4 2 Normative references4 3 Terms and definitions .4 4 Principle4 5 Reagents.4 6 Apparatus .5 7 Sampling and sample preparation.10 8 Procedure .
15、10 9 Calculation and expression of the result 11 10 Precision.11 11 Test report12 Annex A (informative) Results of the inter-laboratory tests.13 Bibliography14 CEN/TS 15478:2006 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:41:26 GMT+00:00 2006, Uncontrolle
16、d Copy, (c) BSI 3 Foreword This document (CEN/TS 15478:2006) has been prepared by Technical Committee CEN/TC 260 “Fertilizers and liming materials”, the secretariat of which is held by DIN. This document has been prepared under a mandate given to CEN by the European Commission and the European Free
17、Trade Association. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this CEN Technical Specification: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland
18、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. CEN/TS 15478:2006 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:41:26 GMT+00:00 20
19、06, Uncontrolled Copy, (c) BSI 4 1 Scope This Technical Specification specifies a method for the determination of total nitrogen in urea. This method is applied exclusively to urea fertilizers which are nitrate free. 2 Normative references The following referenced documents are indispensable for the
20、 application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. prEN 1482-2, Fertilizers and liming materials Sampling and sample preparation Part 2: Sample preparation EN 1
21、2944-1:1999, Fertilizers and liming materials Vocabulary Part 1: General terms EN 12944-2:1999, Fertilizers and liming materials Vocabulary Part 2: Terms relating to fertilizers (including corrigendum AC:2000) EN ISO 3696:1995, Water for analytical laboratory use Specification and test methods (ISO
22、3696:1987) 3 Terms and definitions For the purposes of this Technical Specification, the terms and definitions given in EN 12944-1:1999 and EN 12944-2:1999 apply. 4 Principle Urea is transformed quantitatively into ammonia by boiling in the presence of sulfuric acid. The ammonia thus obtained is dis
23、tilled from an alkaline medium, the distillate being collected in an excess of standard sulfuric acid. The excess acid is titrated by means of a standard alkaline solution. 5 Reagents 5.1 General Use only reagents of recognized analytical grade and distilled or demineralized water, free from carbon
24、dioxide and all nitrogenous compounds (grade 3 according to EN ISO 3696:1995). 5.2 Potassium sulfate Kjeldahl tablets, 5 g/tablet containing 100 parts K2SO4 to 1 part selenium 5.3 Sulfuric acid concentrated (20 = 1,84 g/ml) 5.4 Sodium hydroxide solution approximately NaOH 500g/l CEN/TS 15478:2006 Li
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