纳米金颗粒修饰的掺硼金刚石薄膜电极对三价砷离子的定量检测

Quantitative detection of As^(3+) by gold nanoparticles modified boron-doped diamond filme lectrode

采用静电力诱导自组装的方法将纳米金颗粒自组装到掺硼金刚石薄膜(BDD)电极表面,采用扫描电子显微镜和X射线光电能谱仪对其表面进行表征。对自组装在BDD电极表面的纳米金颗粒进行种子生长,并用于检测BDD电极之前无法检测的As^(3+)。采用溶出伏安法分别研究了富集时间、富集电位以及电解质溶液对As^(3+)检测的影响,选择出合适的检测参数完成对As^(3+)的定量检测。在盐酸为电解质的条件下,As^(3+)的浓度在小于3×10-6g/L时,As^(3+)的浓度与氧化峰电流表现出良好的线性关系,且最低检测限为0.3×10-6g/L。

The gold nanoparticles were self-assembled on the surface of BDD electrode by electrostatic force induced self-assembly method, and the surface was characterized by scanning electron microscopy and X ray photoelectron spectros- copy. Gold nanoparticles on the surface of BDD electrode growed,and can be used to detect As^3＋ that the BDD electrode can not detect. And the effects of accumulation time, accumulation potential and electrolyte solutions on the detection of As^3＋ were discussed through stripping voltammetry. Then the appropriate parameter can be selected and As^3＋ can be detected. With hydrochloric acid as electrolyte, when the concentration of As^3＋ was less than 3×10^-6 g/L, the concentration of As^3＋ and the peak of oxidation current showed a good linear relationship,and the lowest detectable limit was 0.3 ×10^-6 g/L.