An improved dimethylaminobenzaldehyde procedure for determining urea

Abstract An improved method is presented for the determination of urea using p -dimethylaminobenzaldehyde (DMAB). The procedure yields accurate ( r 2 = 0.98; recovery, 101%) and precise (coefficient of variation = 4.6%) results in 2 min without deproteinization. The method compares favorably with the automated diacetyl monoxime method. The method is subject to the usual interfering substances, except dextran.