【摘要】 研究发现,V(Ⅴ)可在含有H2O2的碱性介质中,在石墨电极表面还原产生钒的平行催化波效应。与此同时,当上述溶液中含有适量的丁基罗丹明B时,丁基罗丹明B可与钒催化还原H2O2的产物反应产生灵敏的电化学发光信号。测定了该体系电化学反应时间和化学发光反应时间,验证了电化学平行催化效应与化学发光结合的可能性。据此建立了测定钒的电化学发光分析新方法,同时提出了电化学平行催化波效应与化学发光信号传感相结合提高电化学分析方法灵敏度的新思路。在最佳的实验条件下,该方法测定V(Ⅴ)的线性范围为4.0×10-7mol/L~8.0×10-5mol/L,检出限为3×10-8mol/L(以3σ计)。更多还原

【Abstract】 It was found that,in the presence of hydrogen peroxide in alkaline medium,vanadate(Ⅴ) could be reduced at the surface of the graphite electrode,giving parallel catalytic wave effect.Further study indicated that,butyl-rhodamine B can react with the reagent produced through vanadate(Ⅴ) catalyzing the reduction of hydrogen peroxide to emit a sensitive CL signal.The electrochemical reaction rate and chemiluminescence reaction rate of this system were measured,and the possibility of the combination of electrochemical parallel catalytic wave effect with chemiluminescence was proved.Based on these findings,a novel electrogenerated chemiluminescence method for the determination of vanadate(Ⅴ) was developed.At the same time,a new concept was also proposed for improving the sensitivity of electrochemical analysis based on the combination of electrochemical parallel catalytic wave effect and chemiluminesence signal sensing.Under the optimum experimental conditions,the linear range was 4.0×10-7 mol/L～8.0×10-5 mol/L for vanadate(Ⅴ).The detection limit was 3×10-8 mol/L.更多还原