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EVS-EN 15705:2023

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

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Kehtiv alates 29.12.2023
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EN 15705:2023
Tegevusala (ICS grupid)
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Staatus
Kuupäev
Tüüp
Nimetus
29.12.2023
Põhitekst
07.06.2010
Põhitekst
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.
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