EN 13475:2001

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Calcium-/Magnesium-Bodenverbesserungsmittel - Bestimmung des Calciumgehaltes - OxalatverfahrenAmendements minéraux basiques - Détermination de la teneur en calcium - Méthode a l'oxalateLiming materials - Determination of calcium content - Oxalate method65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 13475:2001SIST EN 13475:2002en01-november-2002SIST EN 13475:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13475November 2001ICS 65.080English versionLiming materials - Determination of calcium content - OxalatemethodAmendements minéraux basiques - Détermination de lateneur en calcium - Méthode à l'oxalateCalcium-/Magnesium-Bodenverbesserungsmittel -Bestimmung des Calciumgehaltes - OxalatverfahrenThis 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 13475:2001 ESIST EN 13475:2002

ScopeThis European Standard specifies a method for the determination of the calcium content of silicate liming materialsincluding slags.NOTE 1The method has been shown to be suitable for other liming materials too, but there are no precision data available yet.NOTE 2The method is also applicable for the determination of the calcium content of mineral fertilizers.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.ISO 3310-1, Test sieves – Technical requirements and testing – Part 1: Test sieves of metal wire cloth.3 PrincipleAfter dissolution of the sample in a mixture of hydrochloric acid and nitric acid, calcium is precipitated in the form ofcalcium oxalate at a pH between 4,4 and 4,6. The supernatant solution is removed by means of an immersion filter.The calcium oxalate precipitate is dissolved in sulfuric acid and the calcium content is determined by titration withpotassium permanganate.4 Reagents4.1 GeneralCommercially available standard solutions may be used instead of standard solutions produced in the laboratory.Variations in concentration shall be taken into account for the calculation of the results.4.2Hydrochloric acid, 20(HCl) = 1,19 g/ml, c(HCl) = 12,5 mol/l.4.3Nitric acid, 20(HNO3) = 1,40 g/ml, c(HNO3) = 14,9 mol/l.4.4Citric acid solutionDissolve 300 g of citric acid monohydrate in water and make up to 1 l.4.5Ammonium chloride solutionDissolve 100 g of ammonium chloride in water and make up to 1 l. Mix well.4.6Bromocresol greenDissolve 5 g of bromocresol green in ethanol with a volume concentration of ethanol of 96% and make up to 1 l.4.7Ammonium oxalate solution, saturatedDissolve sufficient ammonium oxalate monohydrate (approximately 70 g) in 1 l of water to produce a saturatedsolution. After reaching saturation, filter the solution.SIST EN 13475:2002
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