多壁碳纳米管-CdTe量子点复合修饰电极测定水样中痕量镍  

Determination of trace nickel in water samples with multi-wall carbon nanotube-CdTe quantum dots composite modified electrode

作　　者：明亮[1,2] 习霞[2] 

机构地区：[1]南通大学杏林学院,江苏南通226007 [2]南通大学化学化工学院,江苏南通226007

出　　处：《冶金分析》2012年第6期14-17,共4页Metallurgical Analysis

基　　金：南通市应用研究科技计划项目(K2006018);南通大学自然科学项目(10Z015);南通大学杏林学院科研基金项目(2010K134)

摘　　要：制备了一种新的多壁碳纳米管-CdTe量子点复合修饰电极,利用该电极并通过优化支持电解质及pH值、修饰剂用量、富集电位及时间等测定条件,建立了水样中痕量镍的线性扫描阳极溶出伏安分析法。实验结果表明,在pH 8.0的NH4Cl-NH3.H2O缓冲溶液中,于-1.10V富集5min后,在-0.27V处出现一灵敏度高、峰形较好的镍阳极溶出峰,溶出峰电流与Ni 2+浓度在3.0×10-8～4.0×10-5 mol/L范围内呈良好的线性关系,检出限为1.0×10-8 mol/L。该法用于实际水样中痕量镍的测定,测得结果与原子吸收光谱法测定值一致,相对标准偏差为1.8%～3.6%,加标回收率在99%～104%之间。A linear sweep stripping voltammetry for the determination of trace nickel in water samples was developed by using selfmade multiwall carbon nanotube （MWCNT）CdTe quantum dots （QDs） modified glassy carbon electrode （GCE） and optimizing the determination conditions such as support ing electrolyte and pH, the amount of modifier, accumulation potential and time. The results showed that an anodic stripping peak with high sensitivity and good shape appeared at 0.27 V for nickel after 5 min accumulation at 1.10 V at pH 8.0 NH4C1NH3 .H20 buffer solution, and the stripping peak current varied linearly with the concentration of Ni2＋ over the range of 3.0 X 10^-8to 4.0 X 10^-5 mol/L with a detection limit of 1.0X 10^-8 mol/L. The method was applied to the determination of trace nick el in the actual water samples. The results were consistent with those obtained by atomic absorption spectrometry, and the relative standard deviation were between 1.8% and 3.6% with recoveries be tween 99% and 104%.

关 键 词：碳纳米管 CDTE量子点 溶出伏安法 镍 

分 类 号：O657.15[理学—分析化学]