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《Metallurgical Analysis》 2007-02
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Catalytic spectrophotometric determination of trace manganese using cationic surfactant as sensitizer and alanine as activator

WANG Xiao-ju*,GUO Fei-jun,CHEN Dong-ju(Department of Chemistry,Changchun Normal College,Changchun 130032,China)  
A new catalytic spectrophotometric method for the determination of trace amounts of Mn(Ⅱ)has been developed.The method is based on the catalytic effect of Mn(Ⅱ)on oxidation of light geen by potassium periodate using alanine as an activator and cationic surfactant like cetyl pyridine bromide(CPB)as an sensitizer.The reaction conditions of the catalylic system,kinetic parameters and effects of the coexistent ions on the determination are discussed.The catalytic reaction is considered as a pseudo-zero order reaction having rate constant(k)of 4.8×10-3mol·L-1·s-1 and apparent activation energy(Ea)of 34.14kJmol-1.larger quantities of common ions are allowed to exist.Under the optimum experimental conditions,the linear range is 0.4-300 μg/L,the detection limit is 5.59×10-6 g/L,and the RSD is 0.6%(n=11).The sensitivity in the presence of the surfactant is eleven times more than in the absence of the surfactant.The method has been used for the determination of Mn(Ⅱ)in cast aluminium alloy.The results of this method are in good agreement with those of AAS.
【CateGory Index】: O657.3;O614.711
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