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Transformation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) by permanganate.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chokejaroenrat, Chanat Comfort, Steve D. Harris, Clifford E. Snow, Daniel D. Cassada, David A. Sakulthaew, Chainarong Satapanajaru, Tunlawit |
| Copyright Year | 2011 |
| Abstract | The chemical oxidant permanganate (MnO(4)(-)) has been shown to effectively transform hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) at both the laboratory and field scales. We treated RDX with MnO(4)(-) with the objective of quantifying the effects of pH and temperature on destruction kinetics and determining reaction rates. A nitrogen mass balance and the distribution of reaction products were used to provide insight into reaction mechanisms. Kinetic experiments (at pH ∼ 7, 25 °C) verified that RDX-MnO(4)(-) reaction was first-order with respect to MnO(4)(-) and initial RDX concentration (second-order rate: 4.2 × 10(-5) M(-1) s(-1)). Batch experiments showed that choice of quenching agents (MnSO(4), MnCO(3), and H(2)O(2)) influenced sample pH and product distribution. When MnCO(3) was used as a quenching agent, the pH of the RDX-MnO(4)(-) solution was relatively unchanged and N(2)O and NO(3)(-) constituted 94% of the N-containing products after 80% of the RDX was transformed. On the basis of the preponderance of N(2)O produced under neutral pH (molar ratio N(2)O/NO(3) ∼ 5:1), no strong pH effect on RDX-MnO(4)(-) reaction rates, a lower activation energy than the hydrolysis pathway, and previous literature on MnO(4)(-) oxidation of amines, we propose that RDX-MnO(4)(-) reaction involves direct oxidation of the methylene group (hydride abstraction), followed by hydrolysis of the resulting imides, and decarboxylation of the resulting carboxylic acids to form N(2)O, CO(2), and H(2)O. |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/es104057v |
| PubMed reference number | 21452829 |
| Journal | Medline |
| Volume Number | 45 |
| Issue Number | 8 |
| Alternate Webpage(s) | http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1021&context=watercenterpubs |
| Alternate Webpage(s) | http://masteres.ugr.es/khemia/pages/info_academica/conferencias/resumen_charris/!/download |
| Alternate Webpage(s) | https://doi.org/10.1021/es104057v |
| Journal | Environmental science & technology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
