Vv. Gridin et al., A RENEWABLE LIQUID DROPLET METHOD FOR ONLINE POLLUTION ANALYSIS BY MULTIPHOTON IONIZATION, Analytical chemistry, 69(11), 1997, pp. 2098-2102
A multi-photon ionization based fast conductance (MPIFC) technique was
applied to detect combustion byproduct aerosols. These PAH-polluted a
erosols were on-line sampled by means of renewable water microdroplets
. The environmental cases considered here have involved such common ai
r contaminants as motor car exhaust gas and cigarette smoke. The possi
bility of obtaining useful calibration curves has been addressed. Two
droplet contamination regimes were clearly observed. These have been a
rgued to be associated with either a volume uniform (i.e., a bulk type
) or a surface-favored contamination. The latter regime is possible wh
enever the increasing droplet contamination extends beyond the solubil
ity saturation of the PAH compounds. Detection limits as low as 1 pg w
ere obtained for pyrene-contaminated renewable microdroplets.