Respective Determination of Ascorbic Acid and Dopamine by Controlling Potential Sweeping on the Polyalizarin Red Film Modified Electrode

Abstract

Abstract: The preparation of polyalizarin red film modified electrode(PARE) and its electrocatalytic properties to dopamine(DA) and ascorbic acid(AA) were investigated. DA and AA have different voltammetric behaviour on PARE. The electrode reaction of DA on PARE is a quasi reversible process, but the oxidation of AA on PARE is a completely irreversible reaction. The oxidation peak of DA can be separated from that of AA about 200 mV on PARE. Passing through sweep for two times in different potential ranges, DA and AA can be detected in the same system respectively. The reduction peak current of DA is proportional to its concentration in the range of 8×10^-6 —4×10^-3 mol/L and the detect limit can reach 8×10^-7 mol/L. The oxidation peak current of AA is linear with its concentration from 4.0×10^-5 mol/L to 2.0×10^-2 mol/L. Detect limit of it reaches 1.0×10^-5 mol/L. Compared to the direct derivative voltammetry, the analysis results are very satisfactory.

Key words: Polyalizarin red film modified electrode(PARE), Controlling potential sweeping, Respective determination, Ascorbic acid, Dopamine

CLC Number:

O657.1

TrendMD:

WAN Qi-Jin, YU Jiu-Hong, WANG Gang, YANG Nian-Jun . Respective Determination of Ascorbic Acid and Dopamine by Controlling Potential Sweeping on the Polyalizarin Red Film Modified Electrode[J]. Chem. J. Chinese Universities, 2000, 21(11): 1651.

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Respective Determination of Ascorbic Acid and Dopamine by Controlling Potential Sweeping on the Polyalizarin Red Film Modified Electrode

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