The influence of humidity and chemical concentration on detection efficiency of ketones by differential ion mobility spectrometry

Abstract

The objective of this study was to investigate the effect of humidity and concentration of chemical on the detection efficiency of ketones by the differential ion mobility spectrometry. Nine compounds from ketone family were examined due to the presence of ketones in waters and their adverse impact on the human and environment. The experiments were conducted at ambient temperature and pressure with a flow rate of 2.8 lit/min of purified air. Gas generator with permeation source was utilized as the sample introduction system. For the adjustment of concentration dilution air was added. The gravimetric method was applied for the permeation calculation which is based on weight loss of sample over a certain period. The humidity study shows that DMS-AIMS2 could work in the elevated level of humidity at the ambient temperature and pressure. These experiments display that the sensitivity of DMS-AIMS2 can be substantially increased by increasing the concentration. Besides, limit of detection values might be decreased outstandingly when larger molecules are utilized.