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《Chinese Journal of Analytical Chemistry》 1999-10
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Catalytic Spectrophotometric Determination of Trace Barium Based on the Decoloration Reaction of Erichrome Black T and Dodecylbenzene Sulfonic Sodium

Liu Jiaming (Department of Chemistry, Zhangzhou Normal College, Zhangzhou 363000)Ma Tongsen (Chemistry and Chemical Engineering College, He'nan University, Kaifeng 475001)  
Barium ion can catalyze the decolorization reaction of Erichrome Black T and dodecylbenzene solfonic sodium in a pH 5 of weak acid medium. The condition of kinetics has been studied in detail andthe optimum condition of catalytic kinetic determination of barium was established. The apparent molarabsorptivity . The equation of calibration curve is log+0.008704CBa3+(Ug/L) with the linear range of 0~16μg/L( r= 0. 9991) , the detection limit forbarium is 4.0×10-11 g/mL. This catalytic reaction is a first order reaction and its activation energy E is142.53 kJ/mol, rate constant K is 3.15×10-2/s. The method has been applied to the determination oftrace Ba( E ) in water samples, the results were in agreement with those given by AAS method.
【CateGory Index】: O657.3
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