Contact Transfer of VX from Contaminated Grass onto Army Combat Uniform
Technical Report,01 May 2014,30 Sep 2015
Edgewood Chemical Biological Center Aberdeen Proving Ground United States
Pagination or Media Count:
Toxicological investigations have shown that exposure to surfaces contaminated with chemical warfare agents CWAs can present a contact hazard. Previously, we developed standardized protocols for determining contact transfer exposure of agent from contaminated soils onto Army Combat Boot soles and Army Combat Uniforms ACUs. We adapted those protocols to determine the direct contact transfer of CWA from contaminated leaf surfaces onto ACU swatches. Grass leaves Echinochloa crus-galli from intact, living plants were individually contaminated with 1 L of O-ethyl-S-2-diisopropylaminoethyl methyl phosphonothioate VX. Post-dissemination, leaves were removed, and three layers of ACU were placed atop each contaminated leaf, so that the bottom ACU layer was in direct contact with the VX-contaminated leaf surface. The ACU layers were covered with a Plexiglas disk 0.6 cm thick 9.8 cm diameter to equally distribute the force resulting from central placement of a standard mass atop the disk. Total proportions of VX transferred from contaminated leaves to ACU at 0.017 1 min, 0.25, 0.5, 1, and 4 h post-dissemination were approximately 71, 5, 0.8, 0.3, and 0.1 , respectively, of the VX disseminated per leaf. Trace amounts of VX were detected in the third layers of ACU at times 0.017 and 0.25 h post-dissemination.
- Chemical, Biological and Radiological Warfare