Polycyclic Aromatic Hydrocarbons and Polycyclic Aromatic Sulfur Heterocycles: Examination of Molecular Structure-Fluorescence Probe Character Correlations

Abstract An analytical method is presented in which fish tissue is analyzed for neutral monocyclic and polycyclic aromatic hydrocarbons (AHs) and aromatic sulfur heterocycles (ASHs) by capillary column gas chromatography (CGC) with photoionization detection. The sample enrichment procedure includes saponification with aqueous KOH, acidification of the digestates, and extraction of the aromatic compounds into cyclopentane-dichloromethane. Adsorption chromatography on tandem segments of potassium silicate and silica gel removes 99% of the coextracted lipid. Final enrichment by gel permeation chromatography eliminates residual biogenic material and potentially interfering alkanes. Relatively volatile monoaromatlcs are included among the analytes by virtue of the efficiency of the complementary enrichment steps, the use of small quantities of only low-boiling solvents, and the selectivity of the detector. Most targeted compounds (AHs ranging in size from C3-alkylbenzenes through benzo[ g,h,i]perylene and ASHs within the same size range) can be determined in 5 g (wet weight) samples of fish tissue at concentrations as low as 20 ng/g. Comparisons are made of recoveries of selected AHs under ordinary and gold fluorescent lighting conditions.

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Quantitative structure–activity relationship (QSAR) models for polycyclic aromatic hydrocarbons (PAHs) dissipation in rhizosphere based on molecular structure and effect size

Environmental Pollution ◽

10.1016/j.envpol.2010.04.011 ◽

2010 ◽

Vol 158 (8) ◽

pp. 2773-2777 ◽

Cited By ~ 17

Author(s):

Bin Ma ◽

Huaihai Chen ◽

Minmin Xu ◽

Tahir Hayat ◽

Yan He ◽

...

Keyword(s):

Molecular Structure ◽

Polycyclic Aromatic Hydrocarbons ◽

Aromatic Hydrocarbons ◽

Effect Size ◽

Quantitative Structure Activity Relationship ◽

Activity Relationship ◽

Quantitative Structure ◽

Structure Activity ◽

Polycyclic Aromatic ◽

Qsar Models

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Spectroscopic Investigation of Fluorescence Quenching Agents. Part II: Effect of Nitromethane on the Fluorescence Emission Behavior of Thirty-Six Alternant Benzenoid Polycyclic Aromatic Hydrocarbons

Applied Spectroscopy ◽

10.1366/0003702924123872 ◽

1992 ◽

Vol 46 (8) ◽

pp. 1260-1265 ◽

Cited By ~ 37

Author(s):

Sheryl A. Tucker ◽

Hardjanti Darmodjo ◽

William E. Acree ◽

John C. Fetzer ◽

Maximilian Zander

Keyword(s):

Polycyclic Aromatic Hydrocarbons ◽

Fluorescence Quenching ◽

Aromatic Hydrocarbons ◽

Spectroscopic Investigation ◽

Fluorescence Probe ◽

Fluorescence Emission ◽

Solvent Polarity ◽

Polycyclic Aromatic ◽

Emission Behavior ◽

Emission Intensity Ratio

Nitromethane is examined as a selective quenching agent for discriminating between “alternant” versus “nonalternant” polycyclic aromatic hydrocarbons in unknown mixtures. Of the 36 benzenoid solutes studied, only dibenzo[hi,wx]heptaphene failed to obey the selective quenching rule. Also reported are new experimental fluorescence probe studies for dibenzo[de,st]pentacene, dibenzo[fg,qr]pentacene, naphtho[8,1,2hij)-hexaphene, benzo[vwx]hexaphene, benzo[1,2,3cd;4,5,6c'd‘]diperylene, dibenzo[hi,wx]heptacene, benzo[b]triphenylene, chrysense, and anthracene dissolved in nonelectrolyte solvents of varying polarity. Benzo-[vwx]hexaphene was found to exhibit probe character, as evidenced by a systematic variation in emission intensity ratio with solvent polarity.

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