络合吸附伏安法同时测定多种重金属离子

Simultaneous determination of heavy metal ions by complex adsorption voltammetry

在络合剂亚硝基苯胲 乙醇 乙酸铵体系中,Cr(Ⅵ)、Cd2+、Cu2+、Pb2+、Ni2+等离子都能在汞电极上产生灵敏的阴极络合吸附波,其二次导数伏安峰电流均与离子质量浓度有良好的线性关系,可用于这些离子的定量检测,测定线性范围为Cr(Ⅵ)0.0017～0.67μg mL、Cd2+0.0017～0.117μg mL、Cu2+0.0083～5 8μg mL、Pb2+0.083～1.25μg mL、Ni2+0.17～150μg mL,RSD分别为5.7%、1 3%、1.4%、2 5%和1.6%。方法为工业废水、地表水及生活用水等样品中重金属离子的同时测定提供了可靠、灵敏的检测方法。

The sensitive cathodic voltammetric peaks of Cr(Ⅵ), Cd^(2+), Cu^(2+), Pb^(2+) and Ni^(2+) was observed in EtOH-NH_4Ac medium due to the adsorption of their complexes with nitrosophenyl hydroxylamine on mercury electrode. The second derivative peak heights linearly responded to their concentrations respectively. It provided a method for simultaneous determination of those metals in industrial waste water, surface water and tap water.