Fig. 7From: Identification of acidic degradation products of chemical warfare agents by methylation with trimethylsilyldiazomethane and gas chromatography–mass spectrometryRecovery (%) of SAs and BA (20 μg/ml) in different water samples and soil extracts without and with cation exchange. The samples were silylated with MTBSTFA or methylated with TMSDAMBack to article page