多壁碳纳米管修饰电极测定水样中痕量镉  

Voltammetric determination of trace cadmium in water samples by multi-wall carbon nanotube modified electrode

作　　者：明亮[1] 习霞[1] 陈婷婷[1] 刘杰[2] 

机构地区：[1]南通大学化学化工学院,江苏南通226001 [2]江苏省神经再生重点实验室,江苏南通226001

出　　处：《化学试剂》2007年第12期724-726,766,共4页Chemical Reagents

基　　金：南通市应用研究科技计划项目(K2006018)

摘　　要：通过多壁碳纳米管修饰玻碳电极，建立了水样中痕量镉的线性扫描阳极溶出伏安分析法。优化了支持电解质及pH、修饰剂用量、富集电位及时间等测定条件，在pH4．0的NaAc—HAc缓冲液中，-1．10V富集5min后，溶出峰电流与Cd^2＋浓度在2．0×10^-8～5．0×10^-5mol／L的范围内呈良好的线性关系，检测限为8．0×10^-9mol／L。该法用于实际水样中痕量镉的测定，平均回收率在98．7％～105．0％之间，结果满意。A novel linear sweep stripping vohammetry was developed for the determination of trace cadmium in water samples by the multi-wall carbon nanotube （MWCNT） modified glassy carben electrode （GCE）. The experimental parameters such as the supporting electrolyte and buffer pH, the amount of MWCNT-DHP suspension, the accumulation potential and time, were optimized. The results showed that the stripping peak current varied linearly with the concentration of Cd^2＋ over the range from 2.0×10^-8 to 5.0×10^-5 mol/L with a detection limit of 8.0×10^-9 mol/L after 5 min accumulation at - 1.10 V in a pH 4.0 NaAc-HAc buffer. Using this modified electrode, trace levels of Cd^2＋ in several water samples were determined, and the average recoveries were between 98.7% and 105.0%.

关 键 词：镉 碳纳米管 伏安测定 化学修饰电极 

分 类 号：O614.24[理学—无机化学]