Abstract
Extraction of chemical warfare agents, O-ethyl S-2-(diisopropylamino)ethyl methylphosphonothiolate (VX) in soilsample has been carried out. The extraction was performed using six different solvents including 1% TEA/MeOH,1% NH4OH/MeOH, water pH 2 at the ambient temperature , water pH 2 at temperature 4 0C, water pH 7 at ambienttemperature, and water pH 7 at temperature 4 0C. Percent recovery of VX in soil samples was quantitativelydetermined by mean LC-MS using selected reaction monitoring (SRM). Among the solvents used, water pH 2 attemperature 40C gave the best extraction capability that was indicated by the highest percent recovery of VXobtained. Storing effect of spiked samples was also investigated by extracting the samples containing VX usingwater at pH 2/40C and the degradation product was then identified using multiple reaction monitoring (MRM). Fromthe study, two degradation products were identified as Bis[2-(diisopropylamino)ethyl]disulphide and ethylmethylphosphonate.
Highlights
Prohibiting the development, production, stockpiling and use of chemical weapon came into force on 29 April 1997 under the Chemical Weapons Convention (CWC)
Part of this process involves the verification of chemical warfare agents, their precursors or their degradation products in samples collected from suspected production or storage sites or from the environmental in cases allegation uses (OPCW 1997)
This report is based on the laboratory work focused on the extraction of VX in soil sample and identification of its degradation products
Summary
Prohibiting the development, production, stockpiling and use of chemical weapon came into force on 29 April 1997 under the Chemical Weapons Convention (CWC). For achieving the object and purpose, the convention is administrated by the Organization for the Prohibition of Chemical Weapons (OPCW) based in The Hague, The Netherlands (Söderström et al, 1996; Carrick et al, 2001). Part of this process involves the verification of chemical warfare agents, their precursors or their degradation products in samples collected from suspected production or storage sites or from the environmental in cases allegation uses (OPCW 1997). This report is based on the laboratory work focused on the extraction of VX in soil sample and identification of its degradation products. The LC-MS was employed to screen the VX degradation products
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