Transformation of Unsymmetrical Dimethylhydrazine in Supercritical Water

Kosyakov, D. S.; Ul’yanovskii, N. V.; Ивахнов, А. Д.; Pikovskoi, Ilya I.

doi:10.1134/s1990793119070157

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…Twenty-nine commercially available nitrogen-containing compounds ( Figure 1 ) which are known UDMH transformation products [ 4 , 5 , 27 ] were chosen as analytes. Among them, there are both the acyclic components mentioned in the Introduction (NDMA, TMT, DMF, FADMH, and DMAAN) and a number of heterocyclic compounds (1-methyl-1H-1,2,4-triazole, 1H-pyrazole, pyrazine, pyridine, 1H-imidazole, and their methyl derivatives).…”

Section: Resultsmentioning

confidence: 99%

“…A completely different picture is observed for UDMH pyrolysis products formed under extremely harsh conditions of supercritical water treatment. This sample exhibits a wide variety of the resulting products along with the complete absence of the parent UDMH [ 27 ]. Among them, in addition to NDMA and 1-methyl-1H-1,2,4-triazole, 1-Methyl-1H-Pyrazole, DMF, and FADMH predominate.…”

Section: Resultsmentioning

confidence: 99%

“… Sample 4 . An aqueous solution of 1,1-dimethylhydrazine with an initial concentration of 1000 mg L −1 subjected to pyrolytic gasification in supercritical water for 2 h at 600 °C [ 27 ]. This sample represents a product of detoxification of rocket fuel containing wastewater.…”

Section: Methodsmentioning

confidence: 99%

“…Aqueous solutions of 1,1-dimethylhydrazine transformation products obtained by oxidizing rocket fuel with air oxygen for a long time, as well as a result of its decomposition by pyrolysis in supercritical water [27][28][29], which has prospects for use in purification wastewater from launch sites, where chosen as real samples for testing the developed method. Eight and twenty-two compounds from the list of target analytes were found in the studied Samples 3 and 4, respectively (Table 3).…”

Section: Analyses Of Real Samplesmentioning

confidence: 99%

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Gas Chromatography–Mass Spectrometry Quantification of 1,1-Dimethylhydrazine Transformation Products in Aqueous Solutions: Accelerated Water Sample Preparation

2021

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The use of highly toxic rocket fuel based on 1,1-dimethylhydrazine (UDMH) in many types of carrier rockets poses a threat to environment and human health associated with an ingress of UDMH into wastewater and natural reservoirs and its transformation with the formation of numerous toxic nitrogen-containing products. Their GC-MS quantification in aqueous samples requires matrix change and is challenging due to high polarity of analytes. To overcome this problem, accelerated water sample preparation (AWASP) based on the complete removal of water with anhydrous sodium sulfate and transferring analytes into dichloromethane was used. Twenty-nine UDMH transformation products including both the acyclic and heterocyclic compounds of various classes were chosen as target analytes. AWASP ensured attaining near quantitative extraction of 23 compounds with sample preparation procedure duration of no more than 5 min. Combination of AWASP with gas chromatography–mass spectrometry and using pyridine-d5 as an internal standard allowed for developing the rapid, simple, and low-cost method for simultaneous quantification of UDMH transformation products with detection limits of 1–5 μg L–1 and linear concentration range covering 4 orders of magnitude. The method has been validated and successfully tested in the analysis of aqueous solutions of rocket fuel subjected to oxidation with atmospheric oxygen, as well as pyrolytic gasification in supercritical water modelling wastewater from carrier rockets launch sites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Analyses Of Real Samplesmentioning

confidence: 99%

See 2 more Smart Citations

Gas Chromatography–Mass Spectrometry Quantification of 1,1-Dimethylhydrazine Transformation Products in Aqueous Solutions: Accelerated Water Sample Preparation

2021

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“…Oil recovery at best reaches 50%; it is promising to use SCW fluid to liquefy and displace oil with its simultaneous refining [5]. Particularly toxic substances, for example, rocket fuel heptyl (asymmetric dimethylhydrazine), degrades in SCW mainly with the formation of nitrogen, but at least 400 substances have been identified along the way [6]. Since inorganic salts are insoluble in SCW, it is used for water desalination [7].…”

Section: Scope Of Use Of Supercritical Watermentioning

confidence: 99%