BDD电极差分脉冲伏安法检测Cr(Ⅵ)离子

Determination of Uranium( Ⅵ) by differential pulse voltammetry using BBD electrode

以氢气和甲烷为生长源,硼烷作掺杂源,采用微波等离子体化学气相沉积法（MPCVD）制备掺硼金刚石（BDD）薄膜电极,通过扫描电镜、拉曼光谱对其表面形貌、组成及结晶质量进行分析.将BDD电极作为工作电极,通过差分脉冲阳极溶出伏安法检测溶液中痕量Cr（Ⅵ）浓度.结果表明,BDD电极膜材中金刚石晶粒间密实均匀.而电极差分脉冲吸附溶出伏安法检测Cr（Ⅵ）信号在0.19×10-3 ～3.85×10-3 mol/L范围内呈线性关系,电极检测限达到0.27×10-6mol/L.加入干扰离子后检测效果依然良好.最后,通过实验表明电极在pH =2时检测Cr（Ⅵ）效果较好.

Using microwave plasma chemical vapor deposition technology,BDD film electrodes are prepared with hydrogen and methane as growing source,boranas as doping source.Then the surface texture,composition and crystal quality of obtained films are characterized by scanning electron microscopy （SEM） and Raman spectra.To explore their electrochemistry performance in Cr（Ⅵ） concentration detection,the BDD electrodes are used as working electrodes in Cr （Ⅵ） solution with differential pulse voltammetry.The results show that the diamond grains of BDD electrodes are compact and uniform.The calibration curves of Cr（Ⅵ） can be observed in the range of （0.19 × 10-3-3.85 × 10-3） mol/L and the detection limit can reach 0.27 × 10-6 mol/L.The detection effect remains good after addition of interference ions.It exhibits the excellent Cr（Ⅵ） detection performance of BBD when pH is 2.0.