A photoelectrochemical sensor for ascorbic acid determination based on qucerin/N-ZnO nanomaterial
Taking the semiconductor material N-ZnO as the breakthrough point,the quercetin-modified material as the working electrode,a photoelectrochemical sensor for detecting ascorbic acid based on quercetin-nanomaterial modification was prepared.The photoelectrochemical method was used to analyze the photoresponse ability of different materials on the electrode under the condition of illumination.The difference of photocurrent between different materials was studied.The electron transfer ability of ascorbic acid on the quercetin nanomaterial modified electrode and the oxidation catalytic reaction change were investigated.The experimental conditions affecting results were analyzed.The performance of the new method for the detection of ascorbic acid was evaluated.The concentration of ascorbic acid is between 1.0×10-5 and 1.0×10-4 mol/L.A linear relationship is observed between the concentration of ascorbic acid and peak current.The linear equation is I(µA)=0.284 C(mmol/L)+4.244,and the detection limit is 0.013 µmol/L.The actual sample recovery is 94.5%-99.5%,and the relative standard deviation is 0.6%-2.5%.The method is fast and sensitive,which can be successfully applied to the determination of ascorbic acid in actual samples.
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