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首页> 外文期刊>International Journal of Electrochemical Science >On the Electrochemical Oxidation of Dopamine, Ascorbic Acid and Uric Acid onto a Bare Carbon Paste Electrode from a 0.1 M NaCl Aqueous Solution at pH 7
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On the Electrochemical Oxidation of Dopamine, Ascorbic Acid and Uric Acid onto a Bare Carbon Paste Electrode from a 0.1 M NaCl Aqueous Solution at pH 7

机译：在pH7的0.1M NaCl水溶液中从0.1M NaCl水溶液将多巴胺，抗坏血酸和尿酸的电化学氧化在裸碳浆料上

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From cyclic voltammetry, CV, and differential pulse voltammetry, DPV, the dopamine, DA, ascorbicacid, AA, and uric acid, UA, electrochemical behavior were studied using a bare carbon pasteelectrode, CPE, immersed in a 0.1 M NaCl aqueous solution (pH 7). The results proved that DA, AAand UA oxidation were all diffusion-controlled processes. For DA, from CV experiments, the0 heterogeneous standard rate constant, k , and energy transfer coefficient, were evaluated as 0.0082 -1 cm s and 0.45 respectively however, for AA and UA these parameters could not be measured becausein both cases, during the cathodic potential scan no significant currents were detected, thus bothoxidation processes are irreversible. From the DPV recorded in the system CPE / 0.1 M NaCl at pH 7at different DA, AA or UA concentrations, it was possible to note that for all the cases that the peakcurrent varied linearly with the DA, AA or UA concentration, thus all these substances can beelectrochemically quantified when they are not mixed. In agreement with the results obtained, it could-1 be observed that the bare CPE is more sensitive (23.79 0.04 mM ) toward the UA, as comparedwith the DA and AA, and that the lower detection limit (5.63 0.01 ) was also reached for UA.
机译：从循环伏安法，CV和差分脉冲伏安法，DPV，多巴胺，DA，抗坏血酸，AA和尿酸，UA，使用裸碳转座CPE，浸入0.1M NaCl水溶液中的CPE（pH值） 7）。结果证明，DA，AAAND UA氧化是所有扩散控制的过程。对于DA，从CV实验中，0个异质标准速率常数，k和能量转移系数分别评估为0.0082 -1cm S和0.45，但对于AA和UA，由于两种情况下，不能测量这些参数，在阴极期间潜在扫描没有检测到显着的电流，因此介质过程是不可逆转的。从PH 7AT不同DA，AA或UA浓度的系统CPE / 0.1M NaCl中记录的DPV，可以注意到，对于所有情况，峰电流与DA，AA或UA浓度线性变化，因此所有这些当它们没有混合时，物质可以是电化学量化的。在与所获得的结果一致中，可以观察到裸CPE更敏感（23.79.04 mm），与DA和AA相比，还达到了较低的检测限（5.63 0.01） ua。

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