ISO 25705-2016 肥料. 采用高效液相色谱法 (HPLC) 测定尿素固化物. 异丁叉双尿素和丁烯叉二脲 (方法A) 和次甲基尿素低聚物 (方法B)
Fertilizers - Determination of urea condensates using high-performance liquid chromatography (HPLC) - Isobutylidenediurea and crotonylidenediurea (method A) and methylen-urea oligomers (method B)