Inorganic fertilizers - Determination of methylen-urea oligomers using high-performance liquid chromatography (HPLC)

This document specifies a method for the determination of methylen-urea (MU) oligomers in inorganic fertilizers using high-performance liquid chromatography (HPLC).
The method is applicable to all fertilizers which do not contain interfering organic compounds.
NOTE   By the condensation of urea and formaldehyde, several oligomers are formed, such as methylen-diurea (MDU), dimethylen-triurea (DMTU), trimethylen-tetraurea (TMTU) and higher oligomers. The three molecules named here are the most soluble in water, while the higher compounds are insoluble in hot water, but their nitrogen is available for plants by microbiological decomposition. Also, urea is always a companion of MU-oligomers.

Anorganische Düngemittel - Bestimmung von Methylenharnstoff-Oligomeren mittels Hochleistungsflüssigkeitschromatographie (HPLC)

Dieses Dokument legt ein Verfahren zur Bestimmung von Methylenharnstoff-Oligomeren (MU Oligomeren) in anorganischen Düngemitteln durch Hochleistungs-Flüssigkeitschromatographie (HPLC, en: High Performance Liquid Chromatography) fest.
Das Verfahren ist anwendbar für alle Düngemittel, die keine störenden organischen Verbindungen enthalten.
ANMERKUNG   Durch die Kondensation von Harnstoff und Formaldehyd entstehen verschiedene Oligomere wie Methylendiharnstoff (MDU), Dimethylentriharnstoff (DMTU), Trimethylentetraharnstoff (TMTU) und höhere Oligomere. Die drei hier genannten Moleküle sind die wasserlöslichsten, während die höherkondensierten (längerkettigen) Verbindungen in heißem Wasser unlöslich sind, ihr Stickstoff für die Pflanzen aufgrund von mikrobiologischer Zersetzung jedoch verfügbar ist. Ebenfalls ist Harnstoff immer ein Begleiter von MU Oligomeren.

Engrais inorganiques - Dosage des oligomères de méthylène-urée par chromatographie liquide haute performance (HPLC)

Le présent document spécifie une méthode pour le dosage des oligomères de méthylène-urée (MU) dans les engrais inorganiques par chromatographie liquide à haute performance (HPLC).
La méthode est applicable à tous les engrais qui ne contiennent pas de composés organiques interférents.
NOTE   La condensation d’urée et de formaldéhyde produit des oligomères comme la méthylène-diurée (MDU), la diméthylène-triurée (DMTU), la triméthylène-tétraurée (TMTU) et des oligomères supérieurs. Ces trois molécules sont les plus solubles dans l’eau ; les composés supérieurs sont insolubles dans l’eau chaude, mais leur azote est assimilable par les plantes par décomposition microbiologique. Par ailleurs, l’urée est toujours associée aux oligomères de MU.

Anorganska gnojila - Določanje oligomerov metilenuree s tekočinsko kromatografijo visoke ločljivosti (HPLC)

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Standards Content (Sample)

oSIST prEN 15705:2022
Anorganska gnojila - Določevanje oligomerov metilenuree s tekočinsko
kromatografijo visoke ločljivosti (HPLC)
Inorganic fertilizers - Determination of methylen-urea oligomers using high-performance
liquid chromatography (HPLC)
Anorganische Düngemittel - Bestimmung von Methylen-Harnstoff-Oligomeren mittels
Hochleistungsflüssigkeitschromatographie (HPLC)
Ta slovenski standard je istoveten z: prEN 15705
65.080 Gnojila Fertilizers
oSIST prEN 15705:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 15705:2022

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oSIST prEN 15705:2022

prEN 15705


July 2022
ICS 65.080 Will supersede EN 15705:2010
English Version

Inorganic fertilizers - Determination of methylen-urea
oligomers using high-performance liquid chromatography
 Anorganische Düngemittel - Bestimmung von
Methylen-Harnstoff-Oligomeren mittels
Hochleistungsflüssigkeitschromatographie (HPLC)
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 260.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.



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© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15705:2022 E
worldwide for CEN national Members.

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oSIST prEN 15705:2022
prEN 15705:2022 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Reagents . 4
6 Apparatus and equipment . 5
7 Sampling and sample preparation . 5
8 Procedure . 5
8.1 Calibration . 5
8.1.1 Stock solution of urea, mass concentration ρ ≈ 1 000 mg/kg . 5
8.1.2 Stock solution of methylen-diurea, ρ ≈ 1 000 mg/kg . 6
8.1.3 Stock solution of dimethylen-triurea, ρ ≈ 1 000 mg/kg .

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