EN 15477:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Düngemittel - Bestimmung von wasserlöslichem KaliumEngrais - Détermination de la teneur en potassium soluble dans l'eauFertilizers - Determination of the water-soluble potassium content65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 15477:2009SIST EN 15477:2009en,fr,de01-junij-2009SIST EN 15477:2009SLOVENSKI
STANDARDSIST-TS CEN/TS 15477:20061DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15477January 2009ICS 65.080Supersedes CEN/TS 15477:2006
English VersionFertilizers - Determination of the water-soluble potassiumcontentEngrais - Détermination de la teneur en potassium solubledans l'eauDüngemittel - Bestimmung von wasserlöslichem KaliumThis European Standard was approved by CEN on 30 November 2008.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 CEN 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15477:2009: ESIST EN 15477:2009

Results of the inter-laboratory tests . 10 Bibliography . 11
EN ISO 3696:1995, Water for analytical laboratory use — Specification and test methods (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 The potassium in the sample to be analyzed is dissolved in water. After eliminating or fixing the substances that might interfere with the quantitative determination, the potassium is precipitated in a slightly alkaline medium in the form of potassium tetraphenylborate. 5 Reagents 5.1 General Use only reagents of recognized analytical grade and distilled or demineralized water (grade 3 according to EN ISO 3696:1995). 5.2 Formaldehyde, clear formaldehyde solution with a mass fraction of 25 % to 35 % formaldehyde. 5.3 Potassium chloride, p. a. 5.4 Sodium hydroxide solution, c = 10 mol/l. Care should be taken to ensure that only potassium free sodium hydroxide is used. 5.5 Indicator solution Dissolve 0,5 g of phenolphthalein in ethanol at 90 % and make the volume up to 100 ml. SIST EN 15477:2009
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