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References
1. Official Method of Analyses of AOAC International 16th Edition, Volume 1, 1997; Morgan, W. A.,
and Harford, E. F., J. AOAC, Vol 41, No. 3, 1958; Davis, H.A., J. AOAC, Vol 42, No. 3, 1959.
2. Liquid Chromatographic Determination of Urea in Water-Soluble Urea-Formaldehyde Fertilizer
Products and in Aqueous Urea Solutions: Collaborative Study, J. AOAC International, Vol 87, No.
2, 2004.
3. International Standards Organization Ring Tests Results, “ISO/CD 18643: Determination of Biuret
Contents of Fertilizers by HPLC Method, Milan, Italy, July 7-10, 2014
4. Formaldehyde, Third Edition, J. Fredrick Walker, American Chemical Society Monograph Series,
1964
5. Katz, S. E., Fassbender, C. A., and Greenstein, M., J. AOAC, Vol 53, No. 4, 1970
6. Katz, S. E., Fassbender, C. A., J. AOAC, Vol 56, N0. 4, 1973
7. In part with Late Thomas M. Parham, Jr., R&D Department, Tessenderlo Kerley, Inc., Phoenix,
Arizona