二茂铁修饰碳黑微电极同时测定多巴胺和抗坏血酸

Determination of dopamine and ascorbic acid at ferrocene modified carbon black microelectrodes

研究了神经递质多巴胺(DA)和抗坏血酸(AA)在二茂铁修饰碳黑微电极上的电化学行为。实验结果表明,在pH4.5的磷酸盐中,DA在该电极上的线性范围为2.0×10-6～4.0×10-3mol/L,检出限(3σ)为1.0×10-6mol/L;AA在该电极上的线性范围为6.0×10-6～1.0×10-3mol/L,检出限(3σ)为2.0×10-6mol/L;用这种电极可以同时测定多巴胺,抗坏血酸。

The electrochemical behaviors of ascorbic acid(AA) and dopamine (DA) at ferrocene modified carbon black microelectrodes were studied. In pH 4.50 phosphate buffer solution, the linear range for determining DA was 2.0×10^(-6)～4.0×10^(-3) mol/L with the detection limit(3σ) of 1.0×10^(-6) mol/L. The linear range for determining AA was 6.0×10^(-6)～1.0×10^(-3) mol/L with the detection limit (3σ) of 2.0×10^(-6) mol/L.