APPLICATION 5 NITROVANILINA AS calibration substance to calibrate the time of flight in ion mobility spectrometry

摘要

FIELD: chemistry.;SUBSTANCE: explosive and narcotics detection system using an ion mobility spectrometer detects the presence of vapour or trace particles of target chemicals. Calibration of the spectrometer depends in part on the stability of a calibrant chemical which may be periodically injected together with sample gas into the ionisation region of the spectrometer. The calibrant chemical produces a signal with a drift time that is known relative to target chemicals and may be used to calibrate the expected target chemical drift times. A new solid calibrant chemical, 5-nitrovanillin, is disclosed for this purpose. During calibration the calibrant is heated to produce a calibrant gas.;EFFECT: invention describes a system and a method using a calibrant chemical, having drift time and transfer amplitude which can only be easily changed under the effect of chemical pollutants of the environment, including moisture, so as to provide stability of calibrating an ion mobility spectrometer.;21 cl, 9 dwg