铅-二溴邻苯二胺双草酰胺酸酯络合吸附波研究及应用

Polargraphic Adsorption Wave of Lead-Dibrom-o-benzenediamine-diacetamide Ester Complex and Its Application

在 0 .0 5mol/L氯乙酸 氯乙酸钠 (pH 3.0 )介质中 ,Pb2 + 与二溴邻苯二胺双草酰胺酸酯 (DBAC)生成络合物 ,并吸附于电极表面 ,于 - 0 .6 0V(vs.SCE)得到络合物吸附还原波。其二次微分极谱峰电流与Pb2 + 浓度在 2 .5× 10 -8～ 6 .0× 10 -6mol/L内呈良好的线性关系 ;检出限为 1.5× 10 -8mol/L。方法应用于陶瓷颜料、矿石、人发中微量铅的测定 ,结果满意。

In a buffer solution of 0.05 mol/L ClCH 2COOH-ClCH 2COONa(pH 3.0), the complex of lead-dibrom-o-benzenediamine-diacetamide ester (DBAC) was adsorbed on the surface of mercury electrode and produced a reduction peak at -0.60 V(vs. SCE).The detection limit and the linear range of the concentration of Pb to the single-sweep 2nd-order derivative osilloplarographic peak current (I ″ p) were 1.5×10 -8 mol/L and 2.5×10 -8～6 0×10 -6 mol/L Pb, respectively.The method has been applied to the determination of trace Pb in hair, dyestuff and ore samples with satisfactory results. The mechanism of the electrode process has also been studied.