School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China.
Talanta. 2010 Oct 15;82(5):1820-5. doi: 10.1016/j.talanta.2010.07.081. Epub 2010 Aug 7.
Femtomolar (fM) leveled lead ions were electrochemically detected using a bucky-gel coated glassy carbon electrode and differential pulse anodic stripping voltammetry. The bucky-gel was composed of dithizone, ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate), and multi-walled carbon nanotubes (MWCNTs). The fabrication of the bucky-gel coated electrode was optimized. The modified electrode was characterized with voltammetry, electrochemical impedance spectroscopy, and chronoamperometry. After the accumulation of lead ions into the bucky-gel modified electrode at -1.2V vs. saturated calomel electrode (SCE) for 5 min in a pH 4.4 sodium acetate-acetate acid buffer solution, differential pulse anodic stripping voltammograms of the accumulated lead show an anodic wave at -0.58 V. The anodic peak current is detectable for lead ions in the concentration range from 1.0 μM down to 500 fM. The detection limit is calculated to be 100 fM. The proposed method was successfully applied for the detection of lead ions in lake water.
使用巴基凝胶涂层玻碳电极和差分脉冲阳极溶出伏安法电化学检测到了毫微微摩尔（fM）级别的铅离子。巴基凝胶由二硫腙、离子液体（1-丁基-3-甲基咪唑六氟磷酸盐）和多壁碳纳米管（MWCNTs）组成。优化了巴基凝胶涂层电极的制备。用伏安法、电化学阻抗谱和计时安培法对修饰电极进行了表征。在 pH 4.4 的醋酸钠-醋酸缓冲溶液中，将 lead ions 于-1.2V（相对于饱和甘汞电极）下在巴基凝胶修饰电极中累积 5 min 后，对累积的 lead 的差分脉冲阳极溶出伏安图在-0.58 V 处显示出一个阳极波。在 1.0 μM 至 500 fM 的范围内，阳极峰电流可检测到 lead 离子。检测限计算为 100 fM。该方法成功应用于湖水 lead 离子的检测。
