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《Chinese Journal of Analytical Chemistry》 2004-07
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Determination of Copper A by Oscillopolarography with Copper-Ferron Complex

Li Lingxia,Qiang Hong,Zou Hong,Gu Xuexin * (Department of Chemistry,Capital Normal University,Beijing 100037)  
In an alkaline medium containing ferron and sodium dodecylbenzene sulfonate (SDBS),a sensitive peak current of copper (in second derivative oscillopolarography) was observed at -0.55 V ( vs . SCE). In the presence of sodium dodecylbenzene sulfonate (SDBS) the current response was increased about 27 times compared to that obtained without SDBS. Under the optimum experimental conditions of 0.1 mol/L NaHCO_3+4.3×10 -4 mol/L SDBS+1.1×10 -5 mol/L Ferron,the peak current was directly proportional to the concentration of copper in the range from 3.0×10 -9 to 9.4×10 -7 mol/L and the detection limit was 7.8×10 -10 mol/L. The method was applied to the determination of copper in urine and water and the results were reliable and satisfactory. It was shown that Cu 2+ formed a complex with ferron with the mole ratio of 1∶2. The conditional stability constant was calculated to be 8.5×10 11 .
【CateGory Index】: O657.14
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