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Urea nitrate

About: Urea nitrate is a research topic. Over the lifetime, 110 publications have been published within this topic receiving 1048 citations.


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TL;DR: In this article, the decomposition of urea nitrate and guanidine nitrate was determined with isothermal heating followed by quantification of both remaining nitrate, and remaining base.
Abstract: The decompositions of urea nitrate (UN) and guanidine nitrate (GN) are determined with isothermal heating followed by quantification of both remaining nitrate and remaining base. Activation energies determined for UN were 158 and 131 kJ/mol with the preexponential factors being 1.39 × 1012 s−1 and 2.66 × 109 s−1 for nitrate and urea, respectively. These pairs of Arrhenius constants predict decomposition rates less than a factor of two apart. For GN the activation energies were 199 and 191 kJ/mol with the preexponential factors being 1.94 × 1015 s−1 and 3.20 × 1014 s−1 for nitrate and guanidine, respectively. These pairs of Arrhenius constants predict identical decomposition rates. Literature values for ammonium nitrate decomposition indicate that it should decompose somewhat slower than UN and faster than GN. DSC also indicates this ordering but suggested that UN is substantially less stable than was observed in the isothermal experiments. Decomposition products, both gaseous and condensed, are reported f...

45 citations

Journal ArticleDOI
TL;DR: At reproductive growth stage, the absorption, translocation, and assimilation of hydroponically applied urea were greatly improved, and urea should be a suitable hydroponic N source for tomato plants.

43 citations

Journal ArticleDOI
TL;DR: A sensitive, specific and simple color test for the improvised explosive urea nitrate is described, based on the formation of a red pigment upon the reaction between urea Nitrate and p-dimethylaminocinnamaldehyde under neutral conditions.
Abstract: A sensitive, specific and simple color test for the improvised explosive urea nitrate is described. It is based on the formation of a red pigment upon the reaction between urea nitrate and p-dimethylaminocinnamaldehyde (p-DMAC) under neutral conditions. Urea itself, which is the starting material for urea nitrate, does not react with p-DMAC under the same conditions. Other potential sources of false positive response e.g., common fertilizers, medications containing the urea moiety and various amines, do not produce the red pigment with p-DMAC. Exhibits collected from 10 terrorist cases have been tested with p-DMAC. The results were in full agreement with those obtained by instrumental techniques including GC/MS, XRD and IR.

41 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20212
20202
20192
20186
20171
20162