2.3 IMS analysis
Portable IMS equipped with corona discharge ionization source, IMS of Newone S&T (Republic of Korea), was used. The analysis conditions of IMS were as follows: temperature of the sample inlet part was 150oC, temperature of the drift tube was 100oC, the electric field was 200 V/cm, and the ion drift tube was 13.2 cm. The IMS analysis was performed in the negative ion mode. The same experiments were performed 5 times and it was determined to detect the explosive when detecting at least four of the five cases.
Detection limits of the solid-state explosives according to the collection matrices were analyzed. The explosive solutions of 0.1 - 500 ng/µL were prepared. The explosive solution of 1.0 µL was dropped on the collection matrix and the solvent was thoroughly evaporated to obtain solid-state explosive. The matrix was introduced into the sample inlet part of IMS and the IMS analysis was carried out.