SU Min,WANG Huan-huan,GUO Yu-hong,et al.Determination of Oxalic Acid in Urine Using an Electrochemical Alloy-Dealloying Prepared Platinum Nanoparticles Modified Electrode[J].Journal of Instrumental Analysis,2022,41(12):1815-1821.
SU Min,WANG Huan-huan,GUO Yu-hong,et al.Determination of Oxalic Acid in Urine Using an Electrochemical Alloy-Dealloying Prepared Platinum Nanoparticles Modified Electrode[J].Journal of Instrumental Analysis,2022,41(12):1815-1821. DOI: 10.19969/j.fxcsxb.22060801.
Determination of Oxalic Acid in Urine Using an Electrochemical Alloy-Dealloying Prepared Platinum Nanoparticles Modified Electrode
A platinum nanoparticles modified glassy carbon electrode(Pt NPs/GCE) was fabricated by electrochemical alloy-dealloying method for the determination of oxalic acid(OA) in urine.The Pt-Bi alloy particles were electrochemically deposited on the electrode surface at -0.4 V in HClO,4, solution containing Bi(NO,3,),3,,K,2,PtCl,4, and EDTA.Then Bi was electrochemically dissolved from the alloy at 1.2 V in HClO,4,,and Pt NPs/GCE was obtained. The composition and morphology of the modifier on the electrode surface were characterized by SEM and EDS techniques.Moreover,the electrochemical behavior of OA on this electrode was studied carefully based on the investigation of preparation conditions of the electrode.The results showed that the electrochemical behavior of OA on this electrode was a diffusion-controlled irreversible oxidation process.Benefiting from porous Pt NPs after electrochemical dealloying,this electrode had a larger active area,and thus had a high electrocatalytic activity for the oxidation of OA.The results of optimizing the electrode preparation showed that the modified electrode exhibited an excellent analytical performance for OA when the deposition solution was 1.0 mmol/L K,2,PtCl,6, + 3.0 mmol/L Bi(NO,3,),3, + 3.0 mmol/L EDTA + 0.10 mol/L HClO,4,,the electrochemical alloy time was 500 s(-0.4 V),and the dealloying time was 1 000 s(1.2 V).The linear ranges of amperometry determination for OA at 1.05 V in 0.10 mol/L HClO,4, were 2.0 × 10,-7,-4.9 × 10,-4, mol/L and 4.9 × 10,-4,-6.3 × 10,-3, mol/L,with correlation coefficients(,r,2,) of 0.999 1 and 0.998 2,respectively.The detection limit and sensitivity of the method for OA were 2.7 × 10,-8, mol/L(3,s,b,) and 83 μA/(mmol·L,-1,),respectively.Compared with other electrochemical sensors,this electrode had the characteristics of high sensitivity,wide linear range,as well as simple preparation.The electrode was applied to the determination of OA in urine with spiked recoveries of 94.6%-102% and RSDs of 2.2%-4.7%.
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