DIN EN 15705-2010 肥料. 使用高效液相色谱法(HPLC)测定尿素冷凝物. 异丁叉二脲和巴豆叉二脲(方法A)和亚甲脲低聚物(方法B). 德文版本EN 15705: 2010
Fertilizers - Determination of urea condensates using high-performance liquid chromatography (HPLC) - Isobutylidenediurea and crotonylidenediurea (method A) and methylene-urea oligomers (method B); German version EN 15705:2010