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The electrooxidation of ascorbic acid (AA) at the bis(4‐pyridyl)disulfide (PySSPy) modified gold electrode was studied. The results showed that the oxidation process was pH‐dependent. It was mainly due to the static interaction between AA and the modified electrode surface. At pH < 5.5, the oxidation is controlled by diffusion and the electrode can be applied to the kinetic and mechanistic study. In the range of 5 × 10−6– 2 × 10−3 mole/L, the peak currents exhibit a good linear relationship with the concentration of AA. The modified electrode has greater stability and can be used in flow detection analysis.
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Xie et al. (1994) studied this question.
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