Tungstate ion resonance Rayleigh scattering method for determination of basic triphenylmethane dyes

In a pH 4.2-6.0 HAc-NaAc buffer medium,the resonance Rayleigh scattering intensities of separate basic triphenylmethane dyes,such as methyl violet (MV),ethyl violet (EV),crystal violet (CV),methyl green (MeG),iodine green (IG),malachite green (MG),light green (LG),and tungstate ion solution,are very weak,but when these cationic dyes react with the tungstate ion (WO 42-) to form ion-association complexes,their RRS are enhanced sharply and new RRS spectra appear.The reaction products of methyl violet,ethyl vi...