Fig. 3From: Identification of acidic degradation products of chemical warfare agents by methylation with trimethylsilyldiazomethane and gas chromatography–mass spectrometryRecovery (%) of MPA (10 µg/ml) in aqueous extracts of clay soil. The solution was cation-exchanged and evaporated to dryness, and the residue was dissolved in 0.2 M or 1 M AcMeOH before TMSDAM methylation (0.05 ml or 0.1 ml of TMSDAM). The recovery of MPA derivatized by DAM is shown for comparisonBack to article page