ISO 25705:2016 PDF
Fertilizers — Determination of urea condensates using high-performance liquid chromatography (HPLC) — Isobutylidenediurea and crotonylidenediurea (method A) and methylen-urea oligomers (method B)
Fertilizers — Determination of urea condensates using high-performance liquid chromatography (HPLC) — Isobutylidenediurea and crotonylidenediurea (method A) and methylen-urea oligomers (method B)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 17
- Дата публикации:
- 6 апреля 2016 г.
- Издание:
- ISO IS 25705 edition 1 version 1
- ICS:
- 65.080
ISO 25705:2016 specifies methods for the determination of isobutylidene diurea (IBDU), Crotonylidene diurea (CDU) (method A) and methylene-urea oligomers (MU) (method B) in fertilizers using high-performance liquid chromatography (HPLC). The method is applicable to all fertilizers which do not contain interfering organic compounds.
Abstract
Overview
ISO 25705:2016 specifies validated analytical methods for the determination of urea condensates in fertilizers by high-performance liquid chromatography (HPLC). It covers two methods:
- Method A - quantification of isobutylidene diurea (IBDU) and crotonylidene diurea (CDU);
- Method B - determination of methylene‑urea (MU) oligomers (soluble oligomers such as MDU, DMTU, TMTU and urea).
The standard applies to fertilizers that do not contain interfering organic compounds and supports regulatory declaration of these substances and their contribution to nitrogen content.
Key topics and technical requirements
- Sample preparation: Follow ISO 14820-2 guidance; for Method A a representative ground sample (
Технические детали
- Технический комитет
- ISO/TC 134 - Fertilizers, soil conditioners and beneficial substances
- SKU
- ISO 25705:2016
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