Laser-induced fluorescence spectrometry of polycyclic aromatic hydrocarbons isolated in vapor-deposited n-alkane matrices

Abstract

The analytical utility of fluorescence spectrometry of polycyclic aromatic hydrocarbons matrix isolated in vapor-deposited, annealed n-heptane deposits is considered. Much greater spectral resolution can be obtained In heptane than in conventional (nitrogen or argon) matrices; the possibilities for selective excitation in alkane matrices of fluorescence of individual compounds in multicomponent samples can be ex-

Aerosol impact on the brightening in Japan

“…Therefore, we adopted measurements of the benzo[ a ]pyrene (BaP) mass concentration as an alternate for black carbon. BaP is highly carcinogenic polycyclic aromatic hydrocarbon that is in general found as an adsorbate on black carbon in automobile exhaust fumes (especially from diesel engines), smoke resulting from the combustion of any organic material, and charbroiled food [ Ishidate , 1979; Drake et al , 1978; Maple et al , 1980; Yang et al , 1980; Gerde et al , 2001]. MEJ has investigated BaP mass concentrations at 23 sites from the 1970s to the mid‐1990s [ Ministry of the Environment of Japan , 1997] and at about 70 sites since the late 1990s [ Ministry of the Environment of Japan , 2009].…”

Laser-excited Shpol'skii spectroscopy for the selective excitation and determination of polynuclear aromatic hydrocarbons

“…Typical bandwidths of PAHs under MIS conditions are of the order of 50-200 cm ^ (78). Recently, other types of matrix materials, such as n-heptane and perfluorohexane, have been enployed to improve spectral resolution (78,79).…”

“…Recently, other types of matrix materials, such as n-heptane and perfluorohexane, have been enployed to improve spectral resolution (78,79). When the Shpol'skii solvent was used, spectral linebroadening was observed (81), and annealing of the sanple matrix at a temperature below the matrix melting point was required to restore the orderliness of the lattice matrix (78). When perfluorohexane used as the matrix, the site selection technique (to be discussed in detail later in this thesis) was enplqyed to provide narrow-lined emissions (79).…”

Fluorescence line narrowing spectrometry of polycyclic aromatic hydrocarbons in organic glasses

“…Wehry and his colleagues have been investigating applications of matrix isolation (MI) spectroscopic techniques to PAH analysis (4,14,21,(27)(28)(29)(30). MI methods usually require that the PAH sample be first separated from any solvent and then vaporized and deposited along with a large excess of "inert" gas as a solid "matrix" on an optical surface within a cryostat.…”