DIN EN 15705:2010-07

Fertilizers containing the condensates of urea and specified aldehydes (with crotonaldehyde called crotonyliden diurea or CDU, with isobutyraldehyde called isobutylidene diurea or IBDU, with formaldehyde called urea formaldehyde or methylene urea or MU) are covered by Annex I of the Regulation (EC) number 2003/2003 as nitrogenous fertilizers. The methods described in this European Standard enable the quantitative determination of these condensates and the determination of the solubility of the MU-oligomers according to the Regulation. This document specifies two methods (method A and method B) for the determination of urea condensates in fertilizers using high-performance liquid chromatography (HPLC). Method A specifies the determination of isobutylidenediurea and crotonylidenediurea. Method B specifies the determination of methylen-urea oligomers. The standard is applicable to all fertilizers which do not contain interfering organic compounds. Both methods have been validated in inter-laboratory tests on the European level. The European Standard has been prepared by CEN/TC 260 "Fertilizers and liming materials", the secretariat of which is held by DIN, with the active German collaboration under the mandate M/335. The responsible standardization committee is Working Committee NA 057-03-02 AA "Düngemittel" ("Fertilizers") of NAL.