EN 15559:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Düngemittel - Bestimmung von Nitrat- und Ammoniumstickstoff nach ArndEngrais - Dosage de l'azote nitrique et ammoniacal selon ArndFertilizers - Determination of nitric and ammoniacal nitrogen according to Arnd65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 15559:2009SIST EN 15559:2009en,fr,de01-junij-2009SIST EN 15559:2009SLOVENSKI
STANDARDSIST-TS CEN/TS 15559:20081DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15559January 2009ICS 65.080Supersedes CEN/TS 15559:2007
English VersionFertilizers - Determination of nitric and ammoniacal nitrogenaccording to ArndEngrais - Dosage de l'azote nitrique et ammoniacal selonArndDüngemittel - Bestimmung von Nitrat- undAmmoniumstickstoff nach ArndThis European Standard was approved by CEN on 6 December 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 15559:2009: ESIST EN 15559:2009

= 20 %. Dissolve 200 g of magnesium chloride (MgCl2.6H2O) in approximately 600 ml to 700 ml of water in a 1 l flat-bottomed flask. To prevent frothing, add 15 g of magnesium sulfate (MgSO4.7H2O). After dissolution add 2 g of magnesium oxide and a few anti-bump granules of pumice stone and concentrate the suspension to 200 ml by boiling, thus expelling any trace of ammonia from the reagents. Cool, make up the volume to 1 l and filter. 5.12 Indicator solutions 5.12.1 Mixed indicator Solution A: Dissolve 1 g of methyl red in 37 ml of sodium hydroxide solution c = 0,1 mol/l and make up to 1 l with water. Solution B: Dissolve 1 g of methylene blue in water and make up to 1 l. Mix one volume of solution A with two volumes of solution B. This indicator is violet in acid solution, grey in neutral solution and green in alkaline solution. Use 0,5 ml (10 drops) of this indicator solution. 5.12.2 Methyl red indicator solution Dissolve 0,1 g of methyl red in 50 ml of 95 % ethanol. Make up to 100 ml with water and filter if necessary. This indicator may be used (4 to 5 drops) instead of that specified in 5.12.1. 5.12.3 Congo red indicator solution Dissolve 3 g of Congo red in 1 l of warm water and filter if necessary after cooling. This indicator may be used, instead of that specified in 5.12.1.or 5.12.2, in the neutralization of acid extracts before distillation, using 0,5 ml per 100 ml of liquid to be neutralized. 5.13 Anti-bump granules, for example pumice stone, washed in hydrochloric acid and reclaimed. SIST EN 15559:2009

5.14 Sodium nitrate, p.a. 6 Apparatus 6.1 Distillation apparatus Consisting of a round-bottomed flask of suitable capacity connected to a condenser by means of a splash head. The equipment is made of borosilicate glass. NOTE The different types of equipment recommended for this determination are reproduced, showing all the features of construction, in Figures 1, 2, 3 and 4. An automatic distillation apparatus may also be used, provided that the results are statistically equivalent. SIST EN 15559:2009

Key 1 round-bottomed, long-necked flask of 1 000 ml capacity 2 distillation tube with a splash head, connected to the condenser by means of a spherical joint (No 18) (the spherical joint for the connection to the condenser may be replaced by an appropriate rubber connection) 3 funnel with a polytetrafluoroethylene (PTFE) tap (6) for the addition of sodium hydroxide (the tap may likewise be replaced by a rubber connection with a clip) 4 six-bulb condenser with spherical joint (No 18) at the entrance, and joined at the issue to a glass extension tube by means of a small rubbe
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