EN 16965:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SODPHQVNRDüngemittel - Bestimmung von Cobalt, Kupfer, Eisen, Mangan und Zink mit Flammen-Atomabsorptionsspektrometrie (FAAS)Engrais - Dosage du cobalt, du cuivre, du fer, du manganèse et du zinc par spectrométrie d'absorption atomique de flamme (FAAS)Fertilizers - Determination of cobalt, copper, iron, manganese and zinc using flame atomic absorption spectrometry (FAAS)65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 16965:2018SIST EN 16965:2018en,fr,de01-junij-2018SIST EN 16965:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16965
January
t r s z ICS
x wä r z r English Version
Fertilizers æ Determination of cobaltá copperá ironá manganese and zinc using flame atomic absorption Engrais æ Dosage du cobaltá du cuivreá du ferá du manganèse et du zinc par spectrométrie d 5absorption
Düngemittel æ Bestimmung von Cobaltá Kupferá Eisená Mangan und Zink mit FlammenæThis European Standard was approved by CEN on
s w October
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
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t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x { x wã t r s z ESIST EN 16965:2018

Statistical results of the inter-laboratory test . 12 Bibliography . 22
10 % as well as of > 10 %. The inter-laboratory study reflects the final properties of the method for determination of individual micro-nutrients in water and aqua regia extracts including extraction steps. WARNING — Persons using this European Standard should be familiar with normal laboratory practice. This European Standard does not purport to address all of the safety issues, if any, associated with its use. It is the responsibility of the user to establish appropriate health and safety practices and to ensure compliance with any national regulatory conditions. IMPORTANT — It is absolutely essential that tests conducted according to this European Standard are carried out by suitably trained staff. SIST EN 16965:2018

= 1,4 g/ml. 6.2.1 Diluted nitric acid solution, c(HNO3) = 5 mol/l. Add 350 ml of nitric acid (6.2) to 650 ml of water (6.1). 6.2.2 Diluted nitric acid solution, c(HNO3) = 0,5 mol/l. Dilute 35 ml nitric acid (6.2.) to 1 l with water (6.1). 6.3 Hydrochloric acid, c(HCl) = 12 mol/l;
= 1,18 g/ml. 6.4 Mixed solution, 0,8 mol/l nitric acid and 1,8 mol/l hydrochloric acid. Add 150 ml of hydrochloric acid (6.3) and 56 ml nitric acid (6.2) to 800 ml of water (6.1). 6.5 Standard stock solutions, cobalt, copper, iron, manganese and zinc standard stock solutions,
= 1 000 mg/l for each element. Both single-element stock solutions and multi-element stock solutions with adequate specification, stating the acid used and the preparation technique, are commercially available. These solutions are considered to be stable for more than one year, but in reference to guaranteed stability, the recommendations of the manufacturer should be considered. Alternatively, the stock solutions may be prepared by dissolution of high purity metals. 6.5.1 Standard solution,
= 100 mg/l of element. Pipette 10 ml of the appropriate standard stock solution (6.5) into a 100 ml volumetric flask. Add 10 ml of diluted nitric acid (6.2.1), fill to the mark with water and mix well. This solution is used to prepare spiked test solutions and calibration solutions. 6.6 Lanthanum solution,
= 10 g/l lanthanum. Place 11,73 g of lanthanum oxide (La2O3) in a 500 ml beaker, add 150 ml of water and slowly add 140 ml of diluted nitric acid (6.2.1). After complete dissolution transfer the solution quantitatively into a 1 000 ml volumetric flask and then make up to 1 l with water (6.1) and mix thoroughly. The substance concentration of this solution amounts to approximately 0,5 mol/l nitric acid. Alternatively, lanthanum chloride, lanthanum sulfate or lanthanum nitrate may be used. Alternative procedures: Dissolve 26,7 g of lanthanum chloride heptahydrate (LaCl3 .7 H2O) or 31,2 g of lanthanum nitrate hexahydrate [La(NO3)3 .6 H2O] or 26,2 g of lanthanum sulfate nonahydrate [La2(SO4)3 .9 H2O] in 150 ml of water (6.1), then add 100 ml of diluted nitric acid (6.2.1). Allow to dissolve and then make up to 1 l with water (6.1). Mix thoroughly. The substance concentration of this solution amounts to approximately 0,5 mol/l nitric acid. SIST EN 16965:2018
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