TY - JOUR
T1 - Fast filter-sampling and analysis of PAH aerosols by laser multiphoton ionization
AU - Litani-Barzilai, Iris
AU - Fisher, Michal
AU - Gridin, Vladimir V.
AU - Schechter, Israel
N1 - Funding Information:
This study was supported by the James–Franck Program for Laser–Matter Interaction, by the Israel Ministry of Labor and by the fund for promotion of research at the Technion — IIT. V.V. Gridin is grateful for financial support by the Israel Ministry of Absorption, given to new immigrant scientists.
PY - 2001/7/17
Y1 - 2001/7/17
N2 - Most current methods for analysis of airborne polycyclic aromatic hydrocarbon (PAH) aerosols are based on filter sampling. We propose a new method for fast screening of the PAH contaminated filters, using laser induced multiphoton ionization (MPI), coupled to a fast-conductance (FC) detection scheme. We show that the porous morphology of glass fiber filters allows direct application of the MPI-FC technique. The results obtained by this method are compared to traditional solvent extraction followed by liquid chromatographic analysis. It has been found that the MPI-FC data represent a surface analysis, rather than a bulk integration. This has been confirmed by performing fluorescence imaging microscopy on the same filters. The calibration plots of the MPI-FC method are linear as long as the outer surface of the sampling filter is not saturated with PAH particulates. When stacking of particulates starts, quantification fails. Several other limitations, resulting from the very nature of this method, are discussed. The sensitivity for PAHs is adequate for environmental analysis and MPI readouts can be obtained after only a few seconds of sampling. Therefore, it is concluded that the method can probably be used for fast screening of PAH aerosols, and for providing the first indication of such a contamination.
AB - Most current methods for analysis of airborne polycyclic aromatic hydrocarbon (PAH) aerosols are based on filter sampling. We propose a new method for fast screening of the PAH contaminated filters, using laser induced multiphoton ionization (MPI), coupled to a fast-conductance (FC) detection scheme. We show that the porous morphology of glass fiber filters allows direct application of the MPI-FC technique. The results obtained by this method are compared to traditional solvent extraction followed by liquid chromatographic analysis. It has been found that the MPI-FC data represent a surface analysis, rather than a bulk integration. This has been confirmed by performing fluorescence imaging microscopy on the same filters. The calibration plots of the MPI-FC method are linear as long as the outer surface of the sampling filter is not saturated with PAH particulates. When stacking of particulates starts, quantification fails. Several other limitations, resulting from the very nature of this method, are discussed. The sensitivity for PAHs is adequate for environmental analysis and MPI readouts can be obtained after only a few seconds of sampling. Therefore, it is concluded that the method can probably be used for fast screening of PAH aerosols, and for providing the first indication of such a contamination.
KW - Analysis
KW - Fast-conductance
KW - Ionization
KW - Laser
KW - PAH aerosols
UR - http://www.scopus.com/inward/record.url?scp=0035902655&partnerID=8YFLogxK
U2 - 10.1016/S0003-2670(01)01026-1
DO - 10.1016/S0003-2670(01)01026-1
M3 - 文章
AN - SCOPUS:0035902655
SN - 0003-2670
VL - 439
SP - 1
EP - 8
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 1
ER -