Abstract
Cationic dyes formed ion-association complexes with tribromo mercury(II) in aqueous solution. The complexes formed were adsorbed on a polyvinyl chloride sheet (soft type), and the colored species adsorbed were used for the measurement of mercury. The optimum concentrations of KBr, H2SO4 and Rhodamine B were 1×10-2 M (M=mol dm-3), 0.3 M and 1×10-4 M, respectively. The detection limit of Hg was 0.04 ppm at shaking time of 10 min. and 35°C. The proposed method is similar to ion pair solvent extraction but is simple and is more desirable than solvent extraction because it does not need any organic solvents.
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