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60.60 Standard published Dec 13, 2023
CEN
CEN/TC 260 Fertilizers and liming materials
European Norm
65.080 Fertilizers
Published
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.
WITHDRAWN
EN 15705:2010
PUBLISHED
EN 15705:2023
60.60
Standard published
Dec 13, 2023