3 edition of Transformation of RDX and HMX under controlled Eh/pH conditions found in the catalog.
Transformation of RDX and HMX under controlled Eh/pH conditions
Cynthia B. Price
|Statement||by Cynthia B. Price, James M. Brannon, Sally L. Yost ; prepared for U.S. Army Corps of Engineers.|
|Series||Technical report -- IRRP-98-2., Technical report (U.S. Army Engineer Waterways Experiment Station) -- IRRP-98-2.|
|Contributions||Brannon, James M., Yost, Sally L., United States. Army. Corps of Engineers., U.S. Army Engineer Waterways Experiment Station., Installation Restoration Research Program.|
|The Physical Object|
|Pagination||v, 25 p. :|
|Number of Pages||25|
Full text of "Draft report on fate and transport of munitions-related materials for the Camp Edwards impact area groundwater quality study: Massachusetts Military Reservation, Cape . 1,3,5,7-tetranitro-1,3,5,7-tetrazocine [HMX], etc.) and improvised explosive components (e.g., ammonium nitrate) exhibit polymorphism.2–5 For example, the explosive RDX can exist in five possible polymorphic states, but only two of the polymorphs (i.e., a and b) are observable under ambient conditions.3,6,7 RDX in the a-phase has an ortho-.
Optical properties of RDX, HMX, AP, HTPB/IPDI and a catalyzed NC/NG propellant (N5) were obtained from μm to 18 μm using FTIR transmission by: Environmental Factor Optimum conditions Available soil moisture % water holding capacity Oxygen > mg/L DO, >10% air-filled pore space for aerobic degradation Redox potential Eh > 50 millivolts Nutrients C:N:P = molar ratio pH to Temperature ºC.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health. Abadin H, Smith C, Ingerman L, et al. Toxicological Profile for RDX. Atlanta (GA): Agency for Toxic Substances and Disease Registry (US); Jan. Since RDX has been documented to be persistent under oxic conditions, it can be concluded that aerobic microorganisms capable of degrading RDX may not be commonly found in soil and groundwater. The U.S. Army Corps of Engineers is currently conducting studies into the potential for bioaugmentation to facilitate aerobic biodegradation of RDX.
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Transformation of RDX and HMX Under Controlled Eh/pH Conditions by Cynthia B. Price, James M. Brannon, WES Sally L.
Yost, DynTel Corporation Approved For Public Release; Distribution Is Unlimited Mea r QUALrMy Co SPEngie r C3)C Prepared for Headquarters, U Cited by: Decreased HMX sorption occurred under highly anaerobic conditions, and increased sorption occurred under highly oxidizing conditions, especially at a pH of 8.
The data obtained in this study indicate that RDX in groundwater moving into an area of intense reduction would not persist under neutral pH by: However, soil properties affecting TNT transformation are only partially understood.
Edaphic factors such as redox are probably important since highest reductive transformation rates occur under anaerobic conditions. TNT transformation products include 2A-DNT, 4A-DNT, 2,4-DANT, and 2,6-DANT.
Azoxytoluenes have also been reported. The objective of this study was to manipulate Eh and pH for enhanced Fe 0-mediated destruction of RDX. This was accomplished by monitoring RDX destruction under controlled Eh-pH conditions (Eh: − to + mV; pH: 2−10).
Decreasing Eh and pH increased RDX destruction Cited by: Transformation of RDX and HMX under controlled Eh/pH conditions Price, Cynthia B. ; Brannon, James M.
; Yost, Sally L. (Environmental Laboratory (U.S.)Engineer Research and Development Center (U.S.), ). Price CB, Brannon JM, Yost SL () Transformation of RDX and HMX under controlled Eh/pH conditions Technical Report IRRP U.S.
Army Engineering Waterways Experimental Station, Vicksburg, MS. Google ScholarCited by: The objective of this study was to manipulate Eh and pH for enhanced Fe 0 -mediated destruction of RDX.
This was accomplished by monitoring RDX destruction under controlled Eh-pH conditions (Eh: − to + mV; pH: 2−10). Decreasing Eh and pH increased RDX destruction.
Transformation of RDX, HMX, and TNT by freshly precipitated iron minerals in Fe II aqueous solutions was determined at pH ± under anaerobic conditions.
As the initial concentration of solution Fe II increased from to mM, transformation increased from 10% to % for RDX and 27% to % for TNT within 24 h; HMX transformation increased from 20% to 96% within 96 by: Assessing the Sensitivity of Quantitative Structural Activity Analysis Models for Evaluating New Military Compounds C.
B., Brannon, J. M., & Yost, S. Transformation of RDX and HMX Under Controlled Eh/pH Conditions. Cramer, R., Clough, S. et al. Assessing the Sensitivity of Quantitative Structural Activity Analysis Models for Cited by: 2.
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Results showed that at pHfreshly precipitated iron minerals transformed RDX, HMX, and TNT with reaction rates increasing with increasing Fe II concentrations.
RDX and HMX transformations in these solutions also increased with increasing pH (). By contrast, TNT transformation was not influenced by pH () except at pH values Cited by: Generally, as shown in Table 2, the onset temperature (T o) of HMX thermal decomposition is between and °C depending on the particle sizes and experimental conditions.
The α-Fe 2 O 3 does not change the T o of HMX, but the peak temperature (T p) is found to have decreased by ° by: This report also describes the processes which affect HMX and RDX in the environment. The major transformation processes of RDX and HMX in the environment are biodegradation and photolysis.
A major factor affecting the transport and treatment of RDX and HMX in soil-water environments is their sorption and desorption to soil by: Hexahydro-1,3,5-trinitro-1,3,5-triazine ("Royal Demolition Explosive" or RDX) is one such explosive contaminant, which is stable under aerobic circumneutral pH conditions [2,3], highly mobile in.
Hydrolysis of RDX and HMX has been noted under alkaline conditions; however, the rate is extremely slow [, ]. Balakrishnan et al. observed the formation of NH 3, NO 2, N 2 O and formaldehyde following alkaline hydrolysis of RDX and HMX at pH > It was proposed that initial denitration of cyclic nitramines was sufficient to induce ring Cited by: The solid–solid phase transition, poor mechanical properties, and high sensitivity has impeded further practical applications of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) based polymer bonded explosives (PBXs).
To address these issues together, a facile and effective route was employed to achieve a coating of polydopamine (PDA) on the surface of explosive crystals via in situ Cited by: 2.
RDX and HMX. RDX and HMX exhibit low, but nearly irreversible sorption to soils, with partition coefficients on the order of 10 −1 –10 1 L kg −1 (Table 4). RDX transformation products (MNX, DNX, TNX) do not appear to sorb readily to solid surfaces (Sheremata et al., ; Heerspink et al., ).Cited by: Edited by two respected U.S.
Army engineers, this book highlights cutting-edge research from leaders in the energetics community. Documenting the history, applications, and environmental behavior of energetic materials, this reference is a valuable resource for anyone working to optimize their massive potential—either now or in the future.
Abstract: Primary release mechanisms for explosives from UXO are identified and conceptual models for UXO fate and transport were developed for the upland and aquatic environments. The state of development for explosives release mechanisms and process descriptor formulations for fate and transport of explosives from UXO were investigated and important data gaps were identified.
Recent developments in formulating model descriptors for subsurface transformation and sorption of TNT, RDX, and HMX: North Carolina State University.; Installation Restoration Research Program (U.S.); Townsend, Daniel M.; Myers, Tommy E.
Transformation of 2,4,6,-trinitrotoluene under controlled Eh/pH conditions: AScI Corporation. Transformation of RDX and HMX in the presence of aqueous Fe(II) was sensitive to pH while TNT loss was not pH-dependent. These results illustrate the important role of Fe(II) and precipitated Fe(II)/Fe(III) minerals in these reactions and support in situ redox manipulation as a remedial option for treating explosives-contaminated groundwater.Our calculations of RDX and HMX charge densities (Figures 3 and and5, 5, respectively) comprise an attempt to discover differences between RDX and HMX: i) RDX nitro group oxygen atoms are more negatively charged than those of HMX.
ii) The nitro group nitrogen atoms of both RDX and HMX are positively by: Using TNT, RDX, and HMX as examples, this paper describes how risk-based standards for HEs can be derived that account for potential multimedia exposures (associated with contaminated air, water, food, and soil) by individuals near a contaminated site, and used to (1) protect public health and safety; (2)prevent limited resources from being dedicated to unnecessary cleanup activities; and (3) identify Cited by: 2.