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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)。
It is found that V (Ⅴ) can reduce the vanadium in the alkaline medium containing H2O2 and produce vanadium parallel catalytic wave effect. In the meantime, when rhodamine B is contained in the above solution in a suitable amount, butyl rhodamine B can react with the product of vanadia-catalyzed reduction of H2O2 to produce a sensitive electrochemiluminescence signal. The electrochemical reaction time and chemiluminescence reaction time of the system were measured, and the possibility of electrochemical parallel catalysis combined with chemiluminescence was verified. Based on this, a new electrochemical luminescence analysis method for the determination of vanadium was established. At the same time, a new idea of electrochemical parallel catalytic wave effect combined with chemiluminescence signal sensing to improve the sensitivity of electrochemical analysis was proposed. Under the optimum experimental conditions, the linear range of V (V) was 4.0 × 10-7mol / L ~ 8.0 × 10-5mol / L and the detection limit was 3 × 10-8mol / L ).