A novel method for measuring the concentration of chloroform based on kinetic parameters at atmosphere

Highlights: • Spectra of CHCl₃ are obtained using CD-IMS operating at atmospheric pressure. • Two different calculation methods are offered to get concentration of CHCl₃. • Concentrations of CHCl₃ are calculated based on the electron capture process. • Concentrations of CHCl₃ are calculated based on the ion molecule reaction process. A novel method is proposed to detect chloroform concentrations based on the kinetic parameters using ion mobility spectrometer with a negative corona discharge ion source operating at atmospheric pressure. Unlike conventional sample introduction mode, in this technique, CHCl₃ enters into the drift tube from the end of drift region carried by the drift gas. There are two tails before Cl⁻ and (CHCl₃)·Cl⁻ ion peaks, which fit to the ions formed in the drift region. Utilizing the kinetic parameters, concentration for CHCl₃ can be calculated. This method not only offers a new way to get concentrations of CHCl₃ under atmospheric pressure.