【摘要】 用单扫描极谱法研究了铜铁试剂(Cup)-六次甲基四胺(C6H12N4)-HAc体系的伏安行为,发现在pH为4.0~4.5,0.4 mol/L的六次甲基四胺中,铜(Ⅱ)、铅(Ⅱ)在铜铁试剂存在下,分别于-0.26 V(vs.SCE)-、0.58 V(vs.SCE)左右产生一尖锐、灵敏的二次导数极谱波.铜(Ⅱ)、铅(Ⅱ)的浓度分别在8.0×10-8~8.0×10-6mol/L、4.0×10-8~8.0×10-6mol/L的范围内与相应的峰电流成线性关系,检出限分别为1.0×10-8mol/L和6.0×10-9mol/L.该方法用于大米、大白菜中铜(Ⅱ)、铅(Ⅱ)浓度的测定,结果满意.更多还原

【Abstract】 The complex of lead and cupperron（Pb（Ⅱ）-Cup） and the complex of copper and cupperron（Cu（Ⅱ）-Cup） are formed in C₆H₁₂N₄-HAc solution at pH 4.0⁴.5.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.更多还原