Abstract
Chemical warfare agent simulants are efficiently recovered from 2-ppm spikes in 1 g of Rocky Mountain Arsenal Standard Soil using methanol-carbon dioxide (5:95) at 300 atm for 2 min at 60°C. Recoveries ( n = 3) were 79 ± 23% for dimethylmethylphosphonate, 93 ± 14% for 2-chloroethylethyl sulfide, 92 ± 13% for diisopropylfluorophosphate and 95 ± 17% for diisopropylmethylphosphonate. Recoveries are higher than, but less precise than those achieved from a 5-min ultrasonic micro-scale extraction using methanol. Much less laboratory waste is generated than the current standard organic solvent extraction method (33 g of soil shaken with 100 ml of chloroform).
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