22/30453274 DC

This standard 22/30453274 DC BS EN 15705. Inorganic fertilizers. Determination of methylen-urea oligomers using high-performance liquid chromatography (HPLC) is classified in these ICS categories:

• 65.080 Fertilizers

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.