ISO 19746:2017规定了测定尿素基肥料中尿素含量的试验程序，包括尿素、尿素醛[亚甲基脲肥料、异丁烯二脲（IBDU）、巴豆烯二脲（CDU）]、尿素三氮唑肥料、尿素硝酸铵（UAN）、硫和聚合物包膜尿素（SCU和PCU），以及含有尿素的复合肥料。该方法基于高效液相色谱法（HPLC）。 提出的方法是AOAC官方方法2003的扩展。 14这是2003年为“水溶性脲醛肥料产品和尿素水溶液中尿素的测定”而进行的合作研究。该方法于2004年发表在AOAC杂志上，并于2003年获得第一次行动批准，2008年获得最后行动批准。 该方法也适用于含尿素肥料中双缩脲含量的测定，其结果于2014年发表在《美国农业科学院学报》上。 该方法于2014年被国际标准化组织（ISO）作为委员会草案（ISO/CD 18643）采用，并经过审查和环试验分析。

ISO 19746:2017 specifies the test procedure for determining the urea content in urea-based fertilizers, including urea, urea aldehydes [methylene urea fertilizers, isobutylene diurea (IBDU), crotonylidene diurea (CDU)], urea triazone fertilizers, urea ammonium nitrate (UAN), sulfur- and polymer-coated urea (SCU and PCU), as well as compound fertilizers containing urea. The method is based on High Performance Liquid Chromatography (HPLC). The proposed method is an extension of the AOAC Official Method 2003.14 which was collaboratively studied for the "Determination of Urea in Water-Soluble Urea-Formaldehyde Fertilizer Products and in Aqueous Urea Solutions" in 2003. The method was published in the Journal of AOAC in 2004^[4] and was granted the First Action in 2003 and the Final Action in 2008. This method also applies to the determination of biuret content in urea containing fertilizer with the results published in the J. AOAC in 2014^[5]. This method was adopted by the International Organization for Standardization (ISO) as a Committee Draft (ISO/CD 18643) in 2014, and after review and the Ring Test Analyses^[6].