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Polarographic Adsorptive Wave of Manganese(Ⅱ) 1,10 Phenanthroline Complex and Its Application

Li jiaxin,Tian fangtuan,Yang bing (Department of chemistry Jishou University, 416000)  
In pH 9.5 NH 3-NH 4Cl buffer solution Mn(Ⅱ) forms a complex with 1,10 phenanthroline and a sensitive adsorptive peak on the single sweep oscillopolarography appeared at - 1.36 V(vs.SCE). The peak current is proportional to the concentration of Mn(Ⅱ) over the range 5×10 -8  ̄5×10 -6 moL/L. The detection Limit is 2×10 -8 moL/L. The determination of microamounts Mn(Ⅱ)in soybeans and tea leaves was made using this method and the results are satisfactory. The character of the polarographic wave and the mechanism of the electrode process were studied. The results indicate that the polarographic wave is an adsorption wave of complex which is caused by the adsorption of 1∶1 complex of Mn(Ⅱ) and 1,10 phenanthroline 2+ , followed by the reduction of 2+ to Mn(Hg).
【CateGory Index】: O657.14
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