Nerve agents and two other chemical warfare agents were extracted from spiked soil with supercritical CO2. Supercritical fluid extraction (SFE) was used as an off‐line technique. The extracts were analyzed with a two‐channel capillary gas chromatograph, equipped with an autosampler and flame ionization and nitrogen‐phosphorus detectors. Compounds were identified and quantified automatically with the help of retention index monitoring (RIM). Recoveries were equal to or better than those obtained with solvent extraction by sonication.
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Kuitunen et al. (1991) studied this question.
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