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Environ Sci Technol

Title:		VX fate on common matrices: evaporation versus degradation
Author(s):		Columbus I; Waysbort D; Marcovitch I; Yehezkel L; Mizrahi DM;
Address:		"Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel. ishayc@iibr.gov.il"
Journal Title:		Environ Sci Technol
Year:		2012
Volume:		20120320
Issue:		7
Page Number:		3921 - 3927
DOI:		10.1021/es300404y
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"A study of the volatilization rate of the nerve agent VX (O-ethyl S-2-(N,N-diisopropylamino)ethyl methylphosphonothiolate) from various urban matrices in a specially designed climatic chamber (model system) is described. The performance of the model system combined with the analytical procedure produced profiles of vapor concentration obtained from samples of VX dispersed as small droplets on the surfaces of the matrices. The results indicated that the bitumen-containing surfaces such as asphalt blocks and bitumen sheets conserve VX and slow-release part of it over a long period of time. No complete mass balance could be obtained for these surfaces. Influence of environmental and experimental parameters as well as the efficacy of decontamination procedure were also measured. From smooth surface tiles a fast release of VX was measured and almost a complete mass balance was obtained, which characterizes the behavior of inert surfaces. Experiments carried out on concrete blocks showed fast decay of the concentration profile along with a very poor reconstruction of the initial quantity of VX, implying that this matrix degraded VX actively due to its multiple basic catalytic sites. To complement this study, solid-state NMR measurements were compared to add data concerning agent-fate within the matrices"
Keywords:		*Construction Materials Decontamination Environmental Restoration and Remediation Hydrocarbons/*chemistry Magnetic Resonance Spectroscopy Organothiophosphorus Compounds/*chemistry Silicon Dioxide/chemistry Surface Properties Volatilization;
Notes:		"MedlineColumbus, Ishay Waysbort, Daniel Marcovitch, Itzhak Yehezkel, Lea Mizrahi, Dana M eng Comparative Study Research Support, Non-U.S. Gov't 2012/03/15 Environ Sci Technol. 2012 Apr 3; 46(7):3921-7. doi: 10.1021/es300404y. Epub 2012 Mar 20"