Resonance Rayleigh scattering method for the determination of polyvinylpyrrolidone using eosin Y as the probe |
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Authors: | Lihong Yu Zhongfang Liu Xiaoli Hu Ling Kong Shaopu Liu |
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Institution: | 1. School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China 2. Key Laboratory on Luminescence and Real-Time Analysis, Ministry of Education, Chongqing, 400715, China 3. Guiyang Environmental Monitoring Centre, Guizhou, 550002, China
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Abstract: | The intensities of resonance Rayleigh scattering (RRS) of poly (vinyl pyrrolidone) (PVP) and of eosin Y (EY) are weak in solutions of pH 2.9 to 3.4. If reacted with each other, the intensities of RRS are largely enhanced and new RRS bands appear at 276 nm and 320 nm. The intensity at 276 nm is linearly related to the concentration of PVP in the range from 0.10 to 1.6 μg mL-1. The correlation coefficient is 0.9987, and the detection limit is 28.7 ng mL-1. The binding mode between PVP and EY was studied by RRS, and by absorption and fluorescence spectroscopy. The optimum reaction conditions and some potential interferences were investigated. The method displays good selectivity and was applied to the determination of PVP in beer. |
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