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Langmuir. 2005 Mar 15;21(6):2386-90.

Degradation kinetics of VX on concrete by secondary ion mass spectrometry.

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1
Battelle Salt Lake City Operations, West Valley City, UT 84120, USA.

Abstract

At trace coverages on concrete surfaces, the nerve agent VX (O-ethyl S-2-diisopropylaminoethyl methyl phosphonothiolate) degrades by cleavage of the P-S and S-C bonds, as revealed by periodic secondary ion mass spectrometry (SIMS). The observed kinetics were (pseudo-) first-order, with a half-life of 2-3 h at room temperature. The rate increased with surface pH and temperature, with an apparent second-order constant of k(OH) = 0.64 M(-1) min(-1) at 25 degrees C and an activation energy of 50-60 kJ mol(-1). These values are consistent with a degradation mechanism of alkaline hydrolysis within the adventitious water film on the concrete surface. Degradation of bulk VX on concrete would proceed more slowly.

PMID:
15752029
DOI:
10.1021/la047933j
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