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5 4 3 log [5,0;-] Flgure 7. Calibration curve for thiosulfate using a pH 8.1 phosphate-citrate mobile phase. 10 pL were injected onto a 0.2-cm X 50-cm column of 200-400 mesh Amberlite strongly acidic cationexchange resin. Current I is peak current in nA. Concentrations are in units of mol/L example thiourea. The calibration curve in Figure 7 was obtained with a detector of the type depicted in Figure 2. ACKNOWLEDGMENTThe authors are grateful to F. Cantwell of the University of Alberta for numerous helpful discussions.High performance llquld chromatography and chemical ionlzetion mass spectrometry have been applied to the Isolation and ldentlficatlon of explosives. The use of ammonla as a reagent gas for chemical ionlzatlon has been evaluated and Its advantages over methane, water, hydrogen, and isobutane are discussed on the basis of data from common explosives. The off-line LC-MS approach has been applied to the analysis of slmple residues from test explosions under controlled conditions to simulate an actual bombing.

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