Objective:To use liquid chromatography/mass spectrometry to detect single-oleic acid sorbitan ester(SP-80)of emulsion explosives residues.Methods:Samples were collected after the ultrasonic cleaning solution with hexane

then filtered

and the filtrate were dried up with the rotary evaporator

dissolved in methanol

and then centrifuged.Chromatographic conditions were as follows:column phenomenex luna of C18 3μm(100×2.0 mm)(ID)

pre-column Luna of C18 3μm(10×2.0 mm)(ID)

mobile phase volume ratio of 1∶200 aqueous solution of acetic acid

isopropyl alcohol of 10∶90; flow rate of 0.20 ml/min

and column temperature of 35℃.MS parameter included drying nitrogen gas temperature of 200℃

nebulizer flow of 1.5 L/min

and detection voltage of 1.40 kV.Results:The linearity range of the assay for SP-80 was 0.2～1 mg/ml with correlation coefficient of 0.997 8

and the detection limit of 1μg/ml.3 extracts detected no significant difference.SP-80 were detected in two tapes emulsion explosives.Conclusion:The method of LC/MS can be used to infer the types of explosives for its operative simplicity

small sample requirement

high sensitivity

and wide linear range.