Extraction and Quenching Procedures for HD and VX on Concrete and Asphalt Substrates
Technical Report,01 Jan 2019,29 Feb 2020
U.S. Army Combat Capabilities Development Command CBC Aberdeen Proving Ground
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Analysis of decontaminant efficacy on concrete and asphalt requires the ability to quench any residual decontaminant and efficiently extract chemical warfare agents from these substrates. Using thin 0.25 in. or smaller coupons of calcium sulfoaluminate CSA concrete and asphalt roofing shingles, extraction methods were developed. On concrete surfaces, chloroform and isopropanol gave reasonable extraction efficiencies after 24 h for HD and VX, respectively. Asphalt could be extracted over 3 h using chloroformacetone mixtures HD and isopropanolacetone mixtures VX. Some decontaminants were found to self-quench over the course of the 4 h residence time. Some oxidative decontaminants required a quench using sodium thiosulfate VX or tetrahydrothiphene HD.
- Chemical, Biological and Radiological Warfare