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Title: Photo-transformation of aqueous nitroguanidine and 3-nitro-1,2,4-triazol-5-one : emerging munitions compounds
Authors: Becher, Julie B.
Beal, Samuel A.
Taylor, Susan.
Dontsova, Katerina M.
Wilcox, Dean E.
Keywords: UV irradiation
Nitroguanidine (NQ)
3-nitro-1; 2; 4-triazol-5-one (NTO)
Transformation products
Transformation pathways
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous Paper (Engineer Research and Development Center (U.S.)) ; no. ERDC/CRREL MP-21-21
Is Version Of: Becher, Julie B., Samuel A. Beal, Susan Taylor, Katerina Dontsova, and Dean E. Wilcox. "Photo-transformation of aqueous nitroguanidine and 3-nitro-1, 2, 4-triazol-5-one: Emerging munitions compounds." Chemosphere 228 (2019): 418-426.
Abstract: Two major components of insensitive munition formulations, nitroguanidine (NQ) and 3-nitro-1,2,4-triazol-5-one (NTO), are highly water soluble and therefore likely to photo-transform while in solution in the environment. The ecotoxicities of NQ and NTO solutions are known to increase with UV exposure, but a detailed accounting of aqueous degradation rates, products, and pathways under different exposure wavelengths is currently lacking. We irradiated aqueous solutions of NQ and NTO over a 32-h period at three ultraviolet wavelengths and analyzed their degradation rates and transformation products. NQ was completely degraded by 30 min at 254 nm and by 4 h at 300 nm, but it was only 10% degraded after 32 h at 350 nm. Mass recoveries of NQ and its transformation products were >80% for all three wavelengths. NTO degradation was greatest at 300 nm with 3% remaining after 32 h, followed by 254 nm (7% remaining) and 350 nm (20% remaining). Mass recoveries of NTO and its transformation products were high for the first 8 h but decreased to 22–48% by 32 h. Environmental half-lives of NQ and NTO in pure water were estimated as 4 and 6 days, respectively. We propose photo-degradation pathways for NQ and NTO supported by observed and quantified degradation products and changes in solution pH.
Description: Miscellaneous Paper
Gov't Doc #: ERDC/CRREL MP-21-21
Rights: Approved for Public Release; Distribution is Unlimited
Size: 15 pages / 761.9 kB
Types of Materials: PDF/A
Appears in Collections:Miscellaneous Paper

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