肾上腺素在亚甲绿碳糊修饰电极上的电催化氧化及流动注射分析

Electrocatalytic Oxidation of Epinephrine at A Methylene Green Chemically Modified Carbon Paste Electrode and Its Flow Injection Analysis Application

将亚甲绿混合在碳糊中制成化学修饰电极对肾上腺素（Ｅｐ）的氧化具有良好的电催化作用，降低Ｅｐ氧化过电位４００ｍＶ。该电极用于流动注射分析（ＦＩＡ）能大大提高Ｅｐ的检测灵敏度。其线性范围为１．０×１０７～５．０×１０４ｍｏｌ／Ｌ；检测限为１．０×１０８ｍｏｌ／Ｌ（０．２５ｐｍｏｌ，Ｓ／Ｎ＝３）。经过６ｄ连续测定，响应值仅下降 １８％。

Methylene green modified carbon paste electrodes show high catalytic activity to epinephrine (Ep), reducing oxidation overpotential by 400mV. In flow injecion analysis of Ep, the linear response range is l. 0 ×l07～ 5. 0×104 mol/L and the detection limit is l×108mol/L eq. 0. 25 pmol when S/N= 3. The electrode retains 82% of its initial re- sponse after continuous detection for 6 days.