Ali A. ENSAFI*
,
Hajar BAHRAMI
,
0Hassan KARIMI-MALEH
,
Shadpour MALLAKPOUR
催化学报
doi:10.1016/S1872-2067(11)60465-8
A carbon paste electrode with added multiwall carbon nanotubes chemically modified with N-(3,4-dihydroxyphenethyl)-3,5-dinitrobenzamide was used as the electrochemical sensor for the determination of trace amounts of isoprenaline. The modified electrode showed good electrocatalytic activity for the anodic oxidation of isoprenaline, which was due to a substantial decrease in the anodic overpo-tential. Under the optimum conditions, measurements using square wave voltammetry had a linear range in the range of 0.3 to 125.0μmol/L of isoprenaline and a detection limit of 0.1μmol/L. The diffusion coefficient and kinetic parameters were determined using electrochemical methods. The relative standard deviation for seven successive assays of 1.0 and 20.0μmol/L isoprenaline were 1.9% and 2.4%, respectively. This electrochemical sensor was successfully applied for the determination of isoprenaline in human urine and injection solution samples.
关键词:
isoprenaline
,
carbon nanotube
,
electrode
,
electrocatalytic effect
,
voltammetry
叶丽清
,
闫莉莉
,
向明武
,
高云涛
,
贝玉祥
贵金属
采用循环伏安法(CV)和差分脉冲伏安法(DPV)，研究了甲啶铂在多壁碳纳米管-离子液体怱饰玻碳电极(MWNTs-[ODMIM]PF6/GCE)上的电化学行为，建立了甲啶铂的测定方法；以紫外-可见光谱法和电化学方法相结合，研究了甲啶铂与 DNA 的嵌插结合作用。结果表明：甲啶铂在MWNTs-[ODMIM]PF6/GCE上有一对氧化还原峰，氧化峰电位Epa与还原峰电位Epc分别为-0.07 V、-0.36 V，峰电位之差为?E=0.29 V，Ipa/Ipc=1.11。在优化条件下，甲啶铂的氧化峰电流与其浓度在2.66~532μmol/L范围内成良好的线性关系(r=0.9994)，检出限为1.33μmol/L。方法操作简便，准确可靠、灵敏度高，可用于甲啶铂含量的直接测定。
关键词:
分析化学
,
甲啶铂
,
多壁碳纳米管
,
离子液体
,
玻碳电极
,
电化学行为
,
伏安法
叶丽清
,
普绍平
,
放茂良
,
高云涛
,
贝玉祥
,
闫莉莉
贵金属
采用恞环伏安法(CV)和差分脉冲伏安法(DPV)，悁究了卡铂在多壁碳纳米管玻碳电极(MWCNTs/GCE)上的电化恘行为并建立了卡铂的测定方法。结果表明：卡铂在多壁碳纳米管玻碳电极上有惊对悦化还原峰，悦化峰电位 Epa与还原峰电位 Epc分别为0.73 V、0.26 V，峰电位之差为?E=0.47 V，Ipa/Ipc=1.57。在优化条件下，卡铂的悦化峰电流与其浓度在0.22~0.67 mmol/L范围内成良好的线性关系(r=0.9942)，检出限为0.2 mmol/L。方法操作简便，准确可靠、灵敏度高，可用于卡铂含量的直接测定。
关键词:
分析化恘
,
卡铂
,
多壁碳纳米管
,
电极
,
电化恘行为
,
伏安法
