SIST EN 13266:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.JQRMLODLangsam freisetzende Düngemittel - Bestimmung der Freisetzungsrate von Nährstoffen - Verfahren für umhüllte DüngemittelEngrais a libération lente - Détermination du mode de libération des éléments nutritifs - Méthode applicable aux engrais enrobésSlow-release fertilizers - Determination of the release of the nutrients - Method for coated fertilizers65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 13266:2001SIST EN 13266:2002en01-november-2002SIST EN 13266:2002SLOVENSKI
STANDARD



SIST EN 13266:2002



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13266October 2001ICS 65.080English versionSlow-release fertilizers - Determination of the release of thenutrients - Method for coated fertilizersEngrais à libération lente - Détermination du mode delibération des éléments nutritifs - Méthode applicable auxengrais enrobésLangsam freisetzende Düngemittel - Bestimmung derFreisetzungsrate von Nährstoffen - Verfahren für umhüllteDüngemittelThis European Standard was approved by CEN on 29 September 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13266:2001 ESIST EN 13266:2002



EN 13266:2001 (E)2ContentspageForeword.31Scope.42Normative references.43Terms and definitions.44Principle.45Apparatus.56Sampling.57Procedure.58Expression of results.69Precision.710Test report.8Annex A (normative)
Criteria for release conditions.9Annex B (informative)
Accelerated test methods based on a elevated temperature.10Bibliography.12SIST EN 13266:2002



EN 13266:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN /TC 260, "Fertilizers and limingmaterials", the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by April 2002, and conflicting national standards shall be withdrawn at the latest byApril 2002.Annex A is normative and annex B is informative.This standard includes a Bibliography.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries 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.SIST EN 13266:2002



EN 13266:2001 (E)41 ScopeThis European Standard specifies a method for the determination of the slow release properties of nutrients fromcoated fertilizers. pH-dependent hydrolysis and degradation by biological or microbial mechanisms are excluded.The specified method is only applicable to products releasing any nutrients by means of a non-biological process(i.e. those where the nutrients are released by a physical mechanism). Microbial attack on the coating (e.g. sulfurcoated fertilizers) and the consequences thereof are not measurable by the technique described.This method involves a lengthy process which may not be appropriate for day to day testing purposes. Acceleratedmethods may be used provided they are correlated with this standard. An example of such an accelerated methodis described in annex B. Regression analysis may also be used for this purpose.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 1482, Sampling of solid fertilizers and liming materials.EN ISO 3696, Water for analytical laboratory use – Specification and test methods (ISO 3696:1987).3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1releasetransfer of a nutrient from the fertilizer to the receiving medium (water)3.2slow releaserelease under the defined conditions meeting each of the criteria set out in annex A3.3initial release of a nutrientthe mass fraction in percent of a nutrient released during the first 24 h after the start of the test3.4stated release timetime period between the start of the test and the release of a given minimum percentage of the specified nutrientNOTEThis may also be referred to as longevity. See annex A.3.5coated fertilizerfertilizer that is encapsulated, by covering it with a water-insoluble material, in order to reduce its release rate inwater4 PrincipleElution of a test portion of a fertilizer with a specified volume of water. Determination of the concentration of thenutrient(s), that have been dissolved in defined time intervals.SIST EN 13266:2002



EN 13266:2001 (E)55 ApparatusOrdinary laboratory apparatus and, in particular, the following:5.1 Glass beakers, of capacity 800 ml, with a lid5.2 One mark volumetric flask, 500 ml capacity5.3 Magnetic stirrer, with a magnetic rod with a size of 25 mm, or any other suitable stirrer5.4 Temperature-control equipment, capable of maintaining the medium at the temperature of (25
0,5)°C6 SamplingSampling and sample preparation shall be carried out in accordance with EN 1482.The method of sampling and of sample preparation shall be indicated in the test report. Take care to avoid damageto, or destruction of, the coating.Do not crush or grind the sample.7 Procedure7.1 Preparation of the test solutionTransfer 500 ml of water, conforming to grade 3 of EN ISO 3696, into a beaker (5.1). Weigh, to the nearest 0,01 g,(10
0,1) g of the fertilizer, add it to the water in the beaker and record the time. Weigh the beaker together with itscontents: the sample of fertilizer, water and stirring rod. Note the total mass to the nearest 1 g. Start the stirrer (5.3)at a rotational frequency of approximately 300 min-1. Cover the beaker with a lid to avoid evaporation of water andmaintain the temperature at (25
0,5)°C with the temperature-control equipment (5.4).Each time it is desired to make a nutrient determination (see 7.2), decant the solution into another beaker (5.1),taking care to avoid any of the undissolved fertilizer being carried over. Refill the beaker (5.1) with water(conforming to grade 3 of EN ISO 3696) at 25°C so as to achieve the previously recorded mass. Continueextraction immediately.Continue the extraction procedure until more than 75 % of the nominal quantity of water soluble nutrients has beenleached.NOTEThe mass ratio of fertilizer test portion to water is limited to a maximum of 2 % to avoid concentration effects7.2 Time intervals for periodic determinations of nutrient contentDetermine the nutrient content at about ten time intervals until the stated release time (for release condition 3). Thefirst determination shall be made after (24
0,25) h (for release condition 1), another one shall be made at day 28from the beginning of the elution (for release condition 2). Choose the intervals for taking the samples with respectto the amounts of leached nutrient concentration and their detection limits (for slow release criteria 1, 2, 3 seeannex A ).EXAMPLEDetermination intervals for a slow-release fertilizer intended to release nutrients over eight months:1) D1after 24 h (day 1);2) D7at day 7 after start, period from day 1 to day 7;3) D14at
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