Ion Mobility Spectrometry of Heavy Metals.
A simple, fast, and inexpensive method was developed for detecting heavy metals via the ion mobility spectrometry (IMS) in the negative mode. In this method, Cl(-) ion produced by the thermal ionization of NaCl is employed as the dopant or the ionizing reagent to ionize heavy metals. In practice, a solution of mixed heavy metals and NaCl salts was directly deposited on a Nichrome filament and electrically heated to vaporize the salts. This produced the IMS spectra of several heavy-metal salts, including CdCl2, ZnSO4, NiCl2, HgSO4, HgCl2, PbI2, and Pb(Ac)2. For each heavy metal (M), one or two major peaks were observed, which were attributed to M·Cl(-) or [M·NaCl]Cl(-)complexes. The method proved to be useful for the analysis of mixed heavy metals. The absolute detection limits measured for ZnSO4 and HgSO4 were 0.1 and 0.05 μg, respectively.
Department of Chemistry, Isfahan University of Technology , Isfahan, 84156-83111, Iran.
Vahideh
V
Ilbeigi
Department of Chemistry, Science and Research Branch, Islamic Azad University , Tehran, Iran.
Younes
Y
Valadbeigi
Department of Chemistry, Isfahan University of Technology , Isfahan, 84156-83111, Iran.
Mahmoud
M
Tabrizchi