摘要
利用电化学沉积法制备了稀土铕（Ⅲ）离子掺杂的类普鲁士蓝化学修饰电极（Eu-PB／GC／CME），采用循环伏安法（CV）和示差脉冲伏安法（DPV）研究了该修饰电极上2，4-二硝基苯酚的电化学行为。结果表明，该修饰电极与裸电极相比能显著提高2，4-二硝基苯酚的还原峰电流，还原电位降低53mV，线性范围明显增宽。还讨论了支持电解质种类、酸度、修饰层厚度和扫速等因素对2，4-二硝基苯酚伏安响应的影响。在优化的实验条件下，2，4-二硝基苯酚的示差脉冲峰电流（Epc=-341mV）与浓度在2．0×10^-5～2．0×10^-3mol／L和2．0×10^-7～8．0×10^-6mol／L范围内分别呈良好的线性关系，回归方程为ipe（μA）=9．821×10^4c（mol／L）＋22．142（r=0．9992，n=10）和ipc（μA）=4．2025×10^5c（mol／L）＋0．3720（r=0．9967，n=8），检出限（3σ）为6．0×106-8mol／L。该电极用于模拟废水样中2,4-二硝基苯酚的测定，回收率为97．3％～103．0％，结果令人满意。
An electrode modified with Prussian blue analogue film doped with Eu3^＋ （Eu-PB/GC/CME） was fabricated using electrodeposition and the electrochemical behavior of 2,4-dinitrophenol at the modified electrode was investigated by cyclic voltammetry and differential pulse voltammetry. Compared with the bare glassy carbon electrode, the reduction peak current of 2,4-dinitrophenol increased markedly, reduction peak potential shifted more positively and the linear range broadened obviously at the Eu-PB/GC/CME. The effects of substrate solution, acidity, deposit amount, scan rate on the voltammetric behavior of 2,4-dinitrophenol were studied. Under the optimum conditions the differential pulse peak current at Epc = - 341 mV increased linearly with the concentration of 2,4-dinitrophenol in the range of 2.0 × 10^-5 - 2.0 × 10^-3 mol/L, linear regression equation： ipc（μA） =9. 821 × 10^4c（mol/L） ＋ 22. 142 （ r = 0. 9992,n = 10） , and in the range of 2. 0 × 10^-7-8.0 × 10^-6, linear regression equation： ipc （μA） = 4. 2025 × 10^5c （mol/L） ＋ 0. 3720 （ r = 0. 9967,n =8 ） respectively. The detection limit of analytical method was 6.0 × 10^-8 mol/L. The modified electrode has been used to the determination of 2,4-dinitrophenol in imitative waste water samples with good results, and the recovery between 97.3% - 103.0%.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2008年第2期241-244,共4页
Chinese Journal of Analytical Chemistry
基金
甘肃省自然科学基金(No.3ZS051-A25-097)资助项目
关键词
2
4-二硝基苯酚
类普鲁士蓝
化学修饰电极
电催化还原
2, 4-Dinitrophenol, Prussian blue analogue, chemically modified electrode, electrocatalytic reduction
