ISO 25705-2016 Fertilizers - Determination of urea condensates using high-performance liquid chromatography (HPLC) - Isobutylidenediurea and crotonylidenediurea.pdf
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1、 ISO 2016 Fertilizers Determination of urea condensates using high- performance liquid chromatography (HPLC) Isobutylidenediurea and crotonylidenediurea (method A) and methylen-urea oligomers (method B) Engrais Dosage des condensats dure par chromatographie liquide haute performance (CLHP) Isobutyli
2、dne diure et crotonylidne diure (mthode A) et oligomres de mthylne-ure (mthode B) INTERNATIONAL STANDARD ISO 25705 First edition 2016-04-01 Reference number ISO 25705:2016(E) ISO 25705:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights r
3、eserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either
4、 ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 25705:2016(E)Foreword iv Introduction v 1 Scope . 1 2 Normat
5、ive references 1 3 T erms and definitions . 1 4 Sampling and sample preparation 1 5 Method A: Determination of CDU and IBDU . 1 5.1 Principle 1 5.2 Reagents 1 5.3 Apparatus 2 5.4 Procedure 2 5.4.1 System parameters of HPLC . 2 5.4.2 Calibration . 2 5.4.3 Preparation of the test portion 3 5.4.4 Measu
6、rement 3 5.4.5 Important annotations . 3 5.5 Calculation 3 6 Method B: Determination of methylene-urea oligomers (MU) 4 6.1 Principle 4 6.2 Reagents 4 6.3 Apparatus 4 6.4 Procedure 5 6.4.1 System parameters of HPLC . 5 6.4.2 Calibration . 5 6.4.3 Preparation of the test solution 6 6.4.4 Measurement
7、7 6.4.5 Important annotations . 7 6.5 Calculations 7 7 Precision method A and method B 8 7.1 Inter-laboratory test. 8 7.2 Repeatability . 8 7.3 Reproducibility . 8 8 Test report . 9 Annex A (informative) Results of the inter-laboratory tests 10 Annex B (informative) Chromatogram and calibration curv
8、es method A 12 Annex C (informative) Chromatogram and calibration curves method B.14 Bibliography .17 ISO 2016 All rights reserved iii Contents Page ISO 25705:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member
9、bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental
10、and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are
11、 described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is d
12、rawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or o
13、n the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity asses
14、sment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information ISO 25705 was prepared by CEN/TC 260 (as EN 15705:2010) and was adopted by Technical Committee ISO/TC 134, Fertilizers and soi
15、l conditioners. The following modifications were made. The references to EN 1482-1 and EN 1482-2 were changed to ISO 14820-1 and ISO 14820-2. In 5.2.1 and 6.2.1, the general text (not related to the water) was moved directly under 5.2 and 6.2, respectively. In Table 1, the word “approximate” was add
16、ed to the column headers for IBDU and CDU. In 5.4.3 and 6.4.3, “the sample grounded” was changed to “the ground sample”. In 6.4.3, “pieces of glass” and “pieces” were replaced by “boiling stones”. In 6.4.2.1, 6.4.2.2, 6.4.2.3, and 6.4.2.4, “by placing the flask in the” was added before “ultrasonic b
17、ath”. In 6.4.2.1, 6.4.2.2, 6.4.2.3, 6.4.2.4, 6.4.2.5 and 6.4.3, “homogenize” was changed to “mix thoroughly”. In 6.4.2.5, “before transferring into” was changed to “before transferring in” three times. In the keys for Figures B.2, B.3, B.4, C.2, C.3, C.4 and C.5, the units for the areas were added.i
18、v ISO 2016 All rights reserved ISO 25705:2016(E) Introduction Fertilizers containing the condensates of urea and specified aldehydes (with crotonaldehyde called crotonyliden diurea or CDU, with isobutyraldehyde called isobutylidene diurea or IBDU, with formaldehyde called urea formaldehyde or methyl
19、ene urea or MU) are covered by Regulation (EC) 2003/2003, Annex I 4as nitrogenous fertilizers. The methods described in this International Standard enable the quantitative determination of these condensates and the determination of the solubility of the MU-oligomers according to the Regulation. ISO
20、2016 All rights reserved v Fertilizers Determination of urea condensates using high-performance liquid chromatography (HPLC) Isobutylidenediurea and crotonylidenediurea (method A) and methylen-urea oligomers (method B) 1 Scope This International Standard specifies methods for the determination of is
21、obutylidene diurea (IBDU), Crotonylidene diurea (CDU) (method A) and methylene-urea oligomers (MU) (method B) in fertilizers using high-performance liquid chromatography (HPLC). The method is applicable to all fertilizers which do not contain interfering organic compounds. 2 Normative references The
22、 following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696,
23、Water for analytical laboratory use Specification and test methods ISO 14820-2, Fertilizers and liming materials Sampling and sample preparation Part 2: Sample preparation EN 12944-1, Fertilizers and liming materials and soil improvers Vocabulary Part 1: General terms EN 12944-2, Fertilizers and lim
24、ing materials and soil improvers Vocabulary Part 2: Terms relating to fertilizers 3 T erms a nd definiti ons For the purposes of this document, the terms and definitions given in EN 12944-1 and EN 12944-2 apply. 4 Sampling and sample preparation Sampling is not part of the method specified in this I
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