Resonance Rayleigh Scattering Spectra of Interaction of Trace Amounts of Cationic Surfactants with Some Acidic Triphenylmethane Dyes and Their Analytical Applications

Abstract

Abstract: In a thin HCl medium,RRS intensities of an alone CS or acidic triphenylmethane dye (TPMD) are very week. However,when TPMD reacts with a CS to form an ion-associate,the RRS intensity is enhanced greatly and a new RRS spectrum appears. The spectral characteristics of the RRS for the ion-associates and the optimum conditions for the reactions are investigated. The intensity of RRS is directly proportional to the mass concentration of CS in the range of 0—3.5 or 0—5.0 μg/mL. The method has a high sensitivity for the determination of CS,their detection limits are between 3.1 and 9.8 ng/mL depending on the different CS. In this case,most metal and non-metal ions do not interfere,so that the method has a good selectivity. Therefore,a sensitive,selective,simple and rapid method for the determination of CS by RRS is developed.

Key words: Acidic triphenylmethane dyes, Cationic surfactants, Resonance Rayleigh scattering(RRS)

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YANG Zhuo, LIU Shao-Pu, LIU Zhong-Fang, HU Xiao-Li. Resonance Rayleigh Scattering Spectra of Interaction of Trace Amounts of Cationic Surfactants with Some Acidic Triphenylmethane Dyes and Their Analytical Applications[J]. Chem. J. Chinese Universities, 2004, 25(6): 1040.

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Resonance Rayleigh Scattering Spectra of Interaction of Trace Amounts of Cationic Surfactants with Some Acidic Triphenylmethane Dyes and Their Analytical Applications

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