1、BS ISO 18642:2016Fertilizer and soil conditioners Fertilizer grade urea General requirementsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 18642:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 18642:2016.The UK part
2、icipation in its preparation was entrusted to TechnicalCommittee CII/37, Fertilisers and related chemicals.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users ar
3、e responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 82551 4ICS 65.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStanda
4、rds Policy and Strategy Committee on 31 July 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 18642:2016 ISO 2016Fertilizer and soil conditioners Fertilizer grade urea General requirementsMatires fertilisantes Engrais lure Exigences gnralesINTERNATIONAL STANDARDI
5、SO18642First edition2016-07-15Reference numberISO 18642:2016(E)BS ISO 18642:2016ISO 18642:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized ot
6、herwise 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 ISO at the address below or ISOs member body in the country of the requester.ISO copyright offic
7、eCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 18642:2016ISO 18642:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Requirement . 25 Testing methods 26 Sampling a
8、nd preparation of test sample 37 Marking and labelling . 38 Package, transport, and storage . 4Bibliography 5 ISO 2016 All rights reserved iiiContents PageBS ISO 18642:2016ISO 18642:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standard
9、s bodies (ISO member 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 organiz
10、ations, governmental 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 fur
11、ther maintenance are 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/directi
12、ves).Attention is drawn 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 In
13、troduction and/or on 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
14、 conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.htmlThe committee responsible for this document is ISO/TC 134, Fertilizers and soil conditione
15、rs.iv ISO 2016 All rights reservedBS ISO 18642:2016ISO 18642:2016(E)IntroductionUrea, also known as carbamide, is the worlds most widely used nitrogen fertilizer product. The production of urea globally has reached 198 million tons and the volume of global trade has reached 45 million tons in the ye
16、ar 2013. About 85 % of the worlds production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. The standard crop-nutrient rating of urea is 46-0-0.For facilitating international fertilizer trade, it
17、 is necessary to have an international and general standard for fertilizer grade urea. ISO 2016 All rights reserved vBS ISO 18642:2016BS ISO 18642:2016Fertilizer and soil conditioners Fertilizer grade urea General requirements1 ScopeThis International Standard specifies the general requirements rega
18、rding testing methods, sampling and preparation of test sample, marking and labelling, package, transport, and storage of fertilizer grade urea.This International Standard is applicable to urea in solid form, e.g. granular, prilled, or pastilled, which is made by the reaction of ammonia with carbon
19、dioxide. Urea can be classified by its intended use, industrial and/or agricultural. It is mainly used as fertilizer in the field of agriculture. This International Standard is only applicable to fertilizer grade urea in the field of agriculture.2 Normative referencesThe following documents, in whol
20、e 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 5315, Fertilizers Determination of t
21、otal nitrogen content Titrimetric method after distillationISO 7410, Fertilizers and soil conditioners Final samples Practical arrangementsISO 7742:1988, Solid fertilizers Reduction of samplesISO 8397, Solid fertilizers and soil conditioners Test sievingISO 8633, Solid fertilizers Simple sampling me
22、thod for small lotsISO 18643, Fertilizers and soil conditioners Determination of biuret content of urea-based fertilizers HPLC methodEN 13466-1:2001, Fertilizers Determination of water content (Karl Fischer methods) Part 1: Methanol as extracting medium3 Terms and definitionsFor the purposes of this
23、 document, the following terms and definitions apply.3.1ureawhite crystalline, or granular, or prill, or pastill, solid synthesized from ammonia and carbon dioxide under high temperature and pressure by a number of processesNote 1 to entry: The molecular formula is CO(NH2)2. The molecular weight is
24、60,053 according to IUPACs 2011 report on standard atomic weights.SOURCE: ISO 8157:2015, 2.2.1.9, modified In the definition, “or prill, or pastill,” has been added. Note 1 to entry has been added.INTERNATIONAL STANDARD ISO 18642:2016(E) ISO 2016 All rights reserved 1BS ISO 18642:2016ISO 18642:2016(
25、E)4 Requirement4.1 Appearance: The product shall be solid, such as in granular or prilled or pastill form, generally white in colour.4.2 Fertilizer grade urea products shall be tested to demonstrate conformance with all the requirements specified in Table 1.Table 1 Requirements of fertilizer grade u
26、reaItems Requirements (%)Total nitrogen (N, mass fraction) 45,0dBiuret (mass fraction)a1,2Moisture content (H2O) (mass fraction) 1,0Particle sizeb,c1,00 4,75 mm 90 %aRegarding the biuret content, the related requirements specified by the countries or regions shall be followed.bParticle size numbers
27、given in this table are indicative. The related parameters such as the diameter which are specified by other countries shall be followed therein. Also, size guide number (SGN), uniformity index (UI), and granulometric spread index (GSI) values can be negotiated between the buyer and seller. (For the
28、 definitions of SGN, UI, and GSI, please refer to ISO 8157:2015; definitions are available on http:/www.iso.org/obp).cIf the product is intended for use in a blended fertilizer, then a UI range should be specified.dTotal N in some countries/regions is 44 %.5 Testing methods5.1 AppearanceVisually ins
29、pect for the presence of contaminant and foreign matter.5.2 Determination of total nitrogen contentsNitrogen contents shall be determined in accordance to ISO 5315.NOTE EN 15478:2009 and AOAC 993.13:1996 are similar in principle to ISO 5315.5.3 Determination of biuret contentBiuret content shall be
30、determined according to ISO 18643.5.4 Determination of moisture (H2O) contentMoisture (H2O) content shall be determined according to EN 13466-1:2001.5.5 Determination of particle sizesParticle sizes shall be determined according to ISO 8397.2 ISO 2016 All rights reservedBS ISO 18642:2016ISO 18642:20
31、16(E)6 Sampling and preparation of test sample6.1 Sampling method6.1.1 Products in bagsCarry out sampling operation by following the procedure described in ISO 8633. Care should be taken to avoid damage to the particles.6.1.2 Products in bulkCarry out sampling operation by following the procedure de
32、scribed in ISO 8633.6.2 Reduction of samplesMix all the increments (collected as in 6.1) uniformly and promptly to form a single aggregate sample using a device or by hand. The aggregate sample is reduced to about 1 kg by the riffle sample divider method (see ISO 7742:1988, A.2) or the quartering me
33、thod (see ISO 7742:1988, A.3). Next, divide into two parts for final laboratory samples. The two laboratory samples are put into two clean and dry glass or plastic containers or any other inert material of adequate resistance capable of maintaining the sample in its original condition. The container
34、s shall be fitted with airtight closures. Carry out all the operations described earlier as rapidly as possible to avoid loss or gain of moisture. Each container shall be secured and sealed following the instruction given in ISO 7410. Each laboratory sample shall be labelled following the instructio
35、ns given in ISO 7410. The label shall, at minimum, carry the following information:a) the name of manufacturer;b) the name of product and type;c) the manufacturers reference and batch number or production date (if available);d) the lot size;e) the date of sampling;f) the place of sampling;g) the sig
36、nature of the sampler;h) the signature and name of the person or his representative on whose premises the sample was taken.One of the containers is used for quality analysis, while the other is kept for potential re-analyses on a later date.6.3 Test sample preparationSelect one of the laboratory sam
37、ples from the two containers obtained in 6.2. Mix the content within the container according to the procedure in ISO 7742:1988, reduce the sample to 100 g as one of the test samples used for determination of all the content indexes required in Table 1. All test samples are to be put into clean dry b
38、ottles to be used for further analysis.7 Marking and labellingMarking and labelling should comply with the applicable national or regional regulations, ISO 7409 and the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). ISO 2016 All rights reserved 3BS ISO 18642:2016ISO 1
39、8642:2016(E)8 Package, transport, and storage8.1 The net mass of each package can be identified as per contractual requirements.8.2 During transportation, the packaged products should be handled with care to avoid moisture, sunlight, and damage.8.3 The products should be stored in a dry, cool place
40、away from sunlight and moisture.4 ISO 2016 All rights reservedBS ISO 18642:2016ISO 18642:2016(E)Bibliography1 ISO 7409, Fertilizers Marking Presentation and declarations2 ISO 8157:2015, Fertilizers and soil conditioners Vocabulary3 AOAC 955.04:1995, Nitrogen (Total) in fertilizers. Kjeldahl4 AOAC 99
41、3.13:1996, Nitrogen (Total) in fertilizers. Combustion method5 EN 15478:2009, Fertilizers Determination of total nitrogen in urea6 EN 15479:2009, Fertilizers Spectrometric determination of biuret in urea7 Globally Harmonized System of Classification and Labelling of Chemicals (GHS) ISO 2016 All righ
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