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《Journal of Central China Normal University(Natural Sciences)》 2006-03
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Polarographic determination of Cu(Ⅱ)、Pb(Ⅱ) in food

SONG Feng,TAN Ying(College of Chemistry,Central China Normal University,Wuhan 430079)  
The complex of lead and cupperron(Pb(Ⅱ)-Cup) and the complex of copper and cupperron(Cu(Ⅱ)-Cup) are formed in C_6H_(12)N_4-HAc solution at pH 4.0~4.5.It shows sensitive derivative waves on single sweep polarography,with peaks potential at-0.58 V(vs.SCE) and-0.26 V(vs.SCE).A linear relationship holds between the peak current and lead concentration in the range of 4.0×10~(-8)~8.0×10~(-6) mol/L;a linear relationship holds between the peak current and copper concentration in the range of 8.0×10~(-8)~8.0×10~(-6) mol/L.The detection limit for Pb(Ⅱ) is 6.0×10~(-9) mol/L and for Cu(Ⅱ) is 1.0×10~(-8) mol/L.This system has been successfully applied to the determination of Pb(Ⅱ)and Cu(Ⅱ)in food.
【CateGory Index】: TS207.3
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