STN EN 15705
| Name: | STN EN 15705 |
| Validity: | Valid |
| Number of pages: | 20 |
| Language: |
EN
|
| Paper: | 14,10€ |
| Electronic version |
a) Only read (without ability to print and copy)
12,69€ b) Without ability to print, with ability to copy (printscreen) 14,10€ c) With ability to print and copy (printscreen) 18,33€ |
| Slovak title | Anorganické hnojivá. Stanovenie metylénmočovinových oligomérov s použitím vysokoúčinnej kvapalinovej chromatografie (HPLC) |
| English title | Inorganic fertilizers - Determination of methylen-urea oligomers using high-performance liquid chromatography (HPLC) |
| Release Date: | 01. 03. 2024 |
| Date of withdrawal: | |
| ICS: | 65.080 |
| Sorting character/National clasification code | 65 4859 |
| Level of incorporation: | idt EN 15705:2023 |
| Official Journal | 02/24 |
| Amendments | |
| Replaced by: | |
| Repleces: | STN EN 15705:2010-07 (65 4859) |
| Note in Official Journal: | |
| Subject of the standard: | 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. |
| Preview: | Náhľad normy (PDF) |