【摘要】 本文在不使用缓冲剂,自动控制pH的条件下,测定了自由铜（Ⅱ）离子催化维生素C有氧氧化的速率方程。在广泛的pH范围内测得了反应速率常数R′与pH的关系曲线。并计算出铜（Ⅱ）离子催化维生素C各物种的个别速率常数R′₀,R′₁,和R′₂。说明了pH对该反应的影响。更多还原

【Abstract】 The results ever reported about the influence of pH on the oxidation of ascorbic acid （H₂A） were quite different and unreasonable. The main reason for this, we think, is the use of buffers. Different buffers have different effects on the reaction.Instead of using buffers, we used automatic potential titrator to control the pH. In the pH range of 3～10, the rate equation of the Cu （Ⅱ） catalyzed aerobic oxidation of ascorbic acid was determined, and the curve of the rate constant R’ against pit was given. From these data, the special rate constants with respect to H₂A, HA^- and A^2- were estimated. The influence of pH on the reaction was discussed.更多还原