铝-邻苯二酚紫(PV)络合吸附波的研究

Study on Complexing Adsorption Wave of Al3+ -PV

在0.02mol.dm^(-3)醋酸铵(pH=4.7)的底液中,邻苯二酚紫可产生良好的示波极谱波,其峰值电位V_(p1)=-0.66 V(VS,SCE),当加入AL^(3+)后,波峰降低,在稍负的电位上产生一新的尖峰波V_(p2)=-0.85V(VS,SCE),峰电流与铝的浓度在1.0×10^(-6)～1.2×10^(-5)mol.dm^(-3)范围内呈线性关系(r=0.9997)检出限为0.8×10^(-6)mol.dm^(-3),该方法可用于铝的含量测定。

In a supporting electrolyte of 0.02 mol. dm-3 NH4Ac(pH4. 7), PV can produce good oscillopo-larographic polarographic wave,a sensitive peak is observed at - 0.66V(VS.SCE) .The peak height is dropped after adding AL3 + .and meanwhile a new peak wave at - 0.85V(VS.SCE)is observed.The peak current is proportional to the concentration of AL3 + in the range from 1.0×10-6to 1.2×10-3mol.dm-3 .The detection limit is 0.8 ×10-6mol. dm-3 .The method is applied to the determination of Al3+ .