Analytical and Bioanalytical Chemistry

, Volume 395, Issue 2, pp 421–428

Urea nitrate, an exceptionally easy-to-make improvised explosive: studies towards trace characterization

  • Tsippy Tamiri
  • Rinat Rozin
  • Nitay Lemberger
  • Joseph Almog
Original Paper


Urea nitrate is a powerful improvised explosive, frequently used by terrorists in the Israeli arena. It was also used in the first World Trade Center bombing in New York in February 1993. It is difficult to identify urea nitrate in post-explosion debris, since only a very small fraction survives the blast. Also, in the presence of water, it readily decomposes to its original components, urea and nitric acid. It is suspected that post-blast debris of urea nitrate can be confused with ammonium nitrate, the main solid product of urea nitrate thermal decomposition. In a comprehensive study towards identification of urea nitrate in post-blast traces, a spectrophotometric technique for quantitative determination of urea nitrate was developed, and conditions were found for extraction and separation of un-exploded traces of urea nitrate with minimal decomposition. Nevertheless, out of 28 samples collected from a series of three controlled firings of urea nitrate charges, only one gave the typical adduct ion by liquid chromatography/mass spectrometry analysis. We found that urea nitrate can be extracted from solid mixtures to organic solvents by using Crown ethers as “host compounds.” The adducts thus formed are solid, crystalline compounds that can be characterized by microanalysis and spectroscopic techniques.


Adduct formation between urea nitrate and 18-crown-6


Forensics Improvised explosives Post-blast Urea nitrate LC/MS Crown ethers 


  1. 1.
    Tamiri T (2000) in: Siegel JA (ed) Encyclopedia of Forensic Sciences. Academic, LondonGoogle Scholar
  2. 2.
    Phillips SA, Lowe A, Marshall M, Hubbard P, Burmeister SG, Williams DR (2000) J Forensic Sci 45(2):324–332Google Scholar
  3. 3.
  4. 4.
    Worsham JE, Busing WR (1969) Acta Crystallogr A B25:572–578Google Scholar
  5. 5.
    Harkema S, Feil D (1969) Acta Crystallogr A B25:589–591Google Scholar
  6. 6.
    Almog J, Kraus S, Glattstein B (1986) J Energ Mater 4:159–167CrossRefGoogle Scholar
  7. 7.
    Kohno Y, Takahashi O, Hiyoshi RI, Nakamura J, Saito K (2003) J Phys Chem A 107:6444–6450CrossRefGoogle Scholar
  8. 8.
    McCord BR, Hargadon KA, Hall KA, Burmeister SG (1994) Anal Chim Acta 288(1–2):43–56CrossRefGoogle Scholar
  9. 9.
    Hargadon KA, McCord BR (1992) J Chromatogr 602:241–247CrossRefGoogle Scholar
  10. 10.
    Almog J, Klein A, Tamiri T, Shloosh Y, Abramovich-Bar S (2005) J Forensic Sci 50(3):582–586CrossRefGoogle Scholar
  11. 11.
  12. 12.
    Almog J, Burda G, Shloosh Y, Abramovich-Bar S, Wolf E, Tamiri T (2007) J Forensic Sci 52(6):1284–1290Google Scholar
  13. 13.
    Tamiri T (2005) Rapid Commun Mass Spectrom 19:2094–2098CrossRefGoogle Scholar
  14. 14.
    Kutty TRN, Murthy ARV (1972) Indian J Technol 10(8):309–312Google Scholar
  15. 15.
    Oxley JC, Smith JL, Naik S, Moran J (2009) J Energetic Mat 27(1):17–39CrossRefGoogle Scholar
  16. 16.
    Kutty TRN, Murthy ARV (1972) Indian J Technol 10(8):305–308Google Scholar
  17. 17.
    Uiterwijk JWHM, van Hummel GJ, Harkema S, Aarts VMLJ, Daasvatn K, Geevers J, den Hertog JrHJ, Reinhoudt DN (1988) J Incl Phenom 6(1):79–100CrossRefGoogle Scholar
  18. 18.
    Doxsee KM, Francis PE, Weakley TJR (2000) Tetrahedron 56(36):6683–6691CrossRefGoogle Scholar
  19. 19.
    Partington JR (1944) In: A text-book of inorganic chemistry, 5th edn. Macmillan, London, p. 858Google Scholar
  20. 20.
    Engel Y, Dahan A, Rozenshine-Kemelmakher E, Gozin M (2007) J Org Chem 72(7):2318–2328CrossRefGoogle Scholar
  21. 21.
    Cagan A, Lu D, Cizek K, La Belle J, Wang J (2008) Analyst 133(5):585–587CrossRefGoogle Scholar
  22. 22.
    Riegner DE, Kazmi SH, Kaplan SEF, Fountain AWIII (2009) 237th ACS National Meeting, Salt Lake City, UT, United States, March22 –26Google Scholar

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Tsippy Tamiri
    • 1
  • Rinat Rozin
    • 2
  • Nitay Lemberger
    • 2
  • Joseph Almog
    • 2
  1. 1.Division of Identification and Forensic Science (DIFS)Israel Police National HQJerusalemIsrael
  2. 2.Casali Institute of Applied ChemistryThe Hebrew University of JerusalemJerusalemIsrael

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