Fig. 2From: Identification of acidic degradation products of chemical warfare agents by methylation with trimethylsilyldiazomethane and gas chromatography–mass spectrometryRecovery (%) of APAs (10 µg/ml) in tap water and aqueous extracts of different soil samples. The aqueous extract was cation-exchanged and evaporated to dryness, and the residue was dissolved in AcMeOH before TMSDAM methylationBack to article page