Effects of Metal Cations on the Fluorescence Intensity of Polycyclic Aromatic Hydrocarbons in Sodium Taurocholate Micellar Solutions

摘要

The effects of Terbium, Europium and Aluminum on the fluorescence intensity of polycycllc aromatic hydrocarbon (PAH) compounds in sodium taurocholate (NaTC) micellar solutions were determined. Aqueous solubility of the PAH appears to play an important role in the effects of the cations, which ranged from fluorescence quenching of relatively soluble PAHs to as much as 18-fold enhancement for the more hydrophobic PAHs. Sensitivities and detection limits were determined for five PAHs in sodium dodecyl sulfate (SDS) micelles, NaTC micelles, and NaTC micelles with Tb3+. Although poorest results were obtained with NaTC micelles, the addition of Tb3+ increased sensitivities and decreased detection limits in most cases to levels at least as good as those obtained with SDS. Detection limits for benzo(K)fluoroanthracene were an order of magnitude lower in NaTC-Tb3+ than in SDS. (mjm)