Selective determination of acenaphthene in mixtures of three-ring polycyclic aromatic hydrocarbons by fluorescence quenching in micellar medium of cetylpyridinium bromide

1997 ◽  
Vol 7 (2) ◽  
pp. 147-153 ◽  
Author(s):  
Juan H. Ayala ◽  
Ana M. Afonso ◽  
Venerando Gonzalez Diaz
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fluorescence Quenching ◽  
Aromatic Hydrocarbons ◽  
Micellar Medium ◽  
Cetylpyridinium Bromide ◽  
Selective Determination ◽  
Polycyclic Aromatic

Fluorescence Quenching of Polycyclic Aromatic Hydrocarbons by Cetylpyridinium Bromide: Discrimination between Alternant and Nonalternant Hydrocarbons

1997 ◽  
Vol 51 (3) ◽  
pp. 380-386 ◽  
Author(s):  
Juan H. Ayala ◽  
Ana M. Afonso ◽  
Venerando González
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fluorescence Quenching ◽  
Aromatic Hydrocarbons ◽  
Dynamic Quenching ◽  
Quenching Mechanism ◽  
Cetylpyridinium Bromide ◽  
Polycyclic Hydrocarbons ◽  
Polycyclic Aromatic ◽  
Premicellar Aggregates ◽  
Fluorescence Dynamic

Molecules of polycyclic hydrocarbons (PAHs) that contain between two and five rings undergo quenching processes in the presence of cetylpyridinium bromide (CPB), which can act as quencher and as surfactant. The CPB concentration and the nature of the PAHs notably influence the inhibition mechanisms of fluorescence. Dynamic quenching is predominant for all hydrocarbons in solutions in which CPB is found in the form of monomers. When the quencher forms premicellar aggregates, fluoranthene, benzo[ a]pyrene, and benz[ a]anthracene undergo dynamic quenching, while for the remaining PAHs the dynamic and static processes coexist. In micellar CPB solutions the static quenching mechanism is predominant. The correlations existing between the quenching constant in the premicellar zone and topological and geometrical descriptors of the PAHs show the different behavior of alternant and nonalternant hydrocarbons.

Solid-surface phosphorescence characterization of polycyclic aromatic hydrocarbons and selective determination of benzo(a)pyrene in water samples

2005 ◽  
Vol 550 (1-2) ◽  
pp. 53-60 ◽  
Author(s):  
A. Salinas-Castillo ◽  
J.F. Fernández-Sánchez ◽  
A. Segura-Carretero ◽  
A. Fernández-Gutiérrez
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Solid Surface ◽  
Aromatic Hydrocarbons ◽  
Water Samples ◽  
Selective Determination ◽  
Polycyclic Aromatic
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