盐酸奎宁与全氟辛烷磺酸体系的共振光散射光谱研究及其分析应用
摘要
The resonance light scattering(RLS) spectra of the interaction Quinine dihydrochloride (Quinine)with perfluorooctane sulfonate (PFOS) was investigated. A RLS method for the determination of PFOS has been established. In pH 2.87 Britton-Robinson (BR) buffer solution, perfluorooctane sulfonate (PFOS) anions can react with the protonated Quinine by electrostatic forces and hydrophobic interactions to form 2:1 ion-association complexes and resulting in greatly enhanced resonance light scattering signals characterized by a peak at 283 nm, and the RLS intensity was proportional to the concentration of PFOS in the range of 0.10 ~ 5.00 μmol/L. The limit of detection is 9.88 nmol/L. In this paper, the optimum reaction conditions and the interference of foreign substances of the system were investigated. The absorption and fluorescence spectra of the system as well as the reaction mechanism were also discussed. This RLS method has been applied to the determination of PFOS in environmental samples and human serum samples with RSD ≤ 4.2%.