DD-CEN-TS-15479-2006.pdf
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1、DRAFT FOR DEVELOPMENT DD CEN/TS 15479:2006 Fertilizers Spectrophotometric determination of biuret 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 15479:2006 This Draft for Develop
2、ment was published under the authority of the Standards Policy and Strategy Committee on 29 December 2006 BSI 2006 ISBN 0 580 49797 6 National foreword This Draft for Development was published by BSI. It is the UK implementation of CEN/TS 15479:2006. This publication is not to be regarded as a Briti
3、sh Standard. 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 Develop
4、ment are requested 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
5、 status. Notification 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 Standar
6、d, to extend 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
7、CII/37, Fertilisers 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 pu
8、blication Amd. 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 15479 September 2006 ICS 65.080 English Version Fer
9、tilizers - Spectrophotometric determination of biuret in urea Engrais - Dtermination photomtrique du biuret dans lure Dngemittel - Spektrometrische Bestimmung von Biuret in Harnstoff This Technical Specification (CEN/TS) was approved by CEN on 24 June 2006 for provisional application. The period of
10、validity of this CEN/TS is limited initially 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
11、the same way as for an EN and to make 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
12、members are the national standards bodies 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, Switze
13、rland and United Kingdom. EUROPEAN COMMITTEE 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.
14、CEN/TS 15479:2006: E Licensed Copy: London 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 an
15、d sample preparation.6 8 Procedure .6 9 Calculation and expression of the result 7 10 Precision.8 11 Test report8 Annex A (informative) Results of the inter-laboratory tests.9 Bibliography10 CEN/TS 15479:2006 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:41
16、:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 Foreword This document (CEN/TS 15479:2006) 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 Co
17、mmission and the European Free 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, Ge
18、rmany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. CEN/TS 15479:2006 Licensed Copy: London South Bank University, London South Bank University, S
19、un Dec 24 04:41:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 1 Scope This Technical Specification specifies a method for the determination of biuret in urea. The method is applicable to urea and urea-based fertilizers. 2 Normative references The following referenced documents are indispensable fo
20、r the 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
21、 EN 12944-1:1999, 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
22、(ISO 3696:1987) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12944-1:1999 and EN 12944-2:1999 apply. 4 Principle In an alkaline medium in the presence of potassium sodium tartrate, biuret and bivalent copper form a violet cupric compound. The absor
23、bance of the solution is measured at a wavelength of about 546 nm. 5 Reagents 5.1 General Use only reagents of recognized analytical grade and distilled or demineralized water, free from carbon dioxide and ammonia (grade 3 according to EN ISO 3696:1995). The quality of the water is particularly impo
24、rtant in this determination. 5.2 Methanol 5.3 Sulfuric acid solution c = approximately 0,05 mol/l 5.4 Sodium hydroxide solution c = approximately 0,1 mol/l CEN/TS 15479:2006 Licensed Copy: London South Bank University, London South Bank University, Sun Dec 24 04:41:26 GMT+00:00 2006, Uncontrolled Co
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