L-Ascorbate anion electro-oxidation on a silver electrode in hydroxide solution in the absence and presence of sodium polysulfide of concentrations from 1 × 10-5 to 4.5 × 10-4 mol/L was studied using cyclic voltammetry and electrochemical impedance spectroscopy.Both hydroxide and polysulfide ions inhibited L-ascorbate ion oxidation,with the poisoning effect of polysulfide ion being more pronounced in the potential range of-0.3 to -0.2 V/SCE.The time constants for L-ascorbate ion oxidation in the absence and presence of polysulfide were,10-3 to 1 × 10 2 s and 1 × 10-4 to 1 × 10-2 S,respectively depending on the potential used for the impedance analysis.Based on the cyclic voltammetry findings,a mechanism for L-ascorbate oxidation in the presence of polysulfide ions was proposed.Impedance calculations based on the kinetic analysis can account for the occurrence of a negative impedance in a potential region around -0.2 WSCE in the Nyquist.
参考文献
| [1] | Kumar S A;Cheng H;Chen S .[J].Reactive and Functional Polymers,2009,69:364. |
| [2] | Chitravathi, S.;Swamy, B.E.K.;Mamatha, G.P.;Sherigara, B.S. .Simultaneous electrochemical determination of dopamine and ascorbic acid using poly (l-serine) modified carbon paste electrode[J].Journal of Molecular Liquids,2011(3):193-199. |
| [3] | Tian L;Chen L;Liu L;Lu N Song W B Xu H D .[J].Sensors and Actuators B:Chemical,2006,113:150. |
| [4] | Fujiwara N;Yasuda K;Ioroi T;Siroma Z Miyazaki Y Kobayashi T .[J].Electrochemical and Solid State Letters,2003,6(12):A257. |
| [5] | Fujiwara N;Siroma Z;Ioroi T;Yasuda K .[J].Journal of Power Sources,2007,164:457. |
| [6] | Majari Kasmaee L;Gobal F .[J].Journal of Power Sources,2010,195:165. |
| [7] | Fujiwara N;Yamazaki S;Siroma Z;Ioroi T Yasuda K .[J].Journal of Power Sources,2007,167:32. |
| [8] | Uhm S;Choi J;Chung S T;Lee J .[J].Electrochimica Acta,2007,53:1731. |
| [9] | Fujiwara N;Yamazaki S;Siroma Z;Ioroi T;Yasuda K .Direct oxidation of L-ascorbic acid on a carbon black electrode in acidic media and polymer electrolyte fuel cells[J].Electrochemistry communications,2006(5):720-724. |
| [10] | Power G P;Ritchie I M;Wylie M T .[J].Electrochimica Acta,1981,26:1633. |
| [11] | Shimizu K;Aoki K;Osteryoung R A .[J].Journal of Electroanalytical Chemistry,1981,129:159. |
| [12] | Aoki K;Shimizu K;Osteryoung R A .[J].Journal of Electroanalytical Chemistry,1981,129:171. |
| [13] | Briss V I;Wright G A .[J].Electrochimica Acta,1981,26:1809. |
| [14] | Briss V I;Wright G A .[J].Electrochimica Acta,1982,27:1. |
| [15] | Horanyi G;Vertes G .[J].Electrochimica Acta,1986,31:1663. |
| [16] | Hepel M;Bruckenstein S;Tang G C .[J].Journal of Electroanalytical Chemistry,1989,261:389. |
| [17] | Hatchett D W;Gao X;Catron S W;White H S .[J].Journal of Physical Chemistry,1996,100:331. |
| [18] | Vericat C;Vela M E;Gago J;Salvarezza R C .[J].Electrochimica Acta,2004,49:3643. |
| [19] | Dryhurst G;Kadish K;Scheller F;Renneberg R.Biological Electrochemistry[M].New York:Academic Press,Inc,1982:256. |
| [20] | Davey MW.;Inze D.;Sanmartin M.;Kanellis A.;Smirnoff N. Benzie IJJ.;Strain JJ.;Favell D.;Fletcher J.;Van Montagu M. .Plant L-ascorbic acid: chemistry, function, metabolism, bioavailability and effects of processing [Review][J].Journal of the Science of Food and Agriculture,2000(7):825-860. |
| [21] | Schrammel,A;Koesling,D;Schmidt,K;Mayer,B .Inhibition of purified soluble guanylyl cyclase by L-ascorbic acid.[J].Cardiovascular Research,2000(3):602-608. |
| [22] | Harris D C.Quantitative Chemical Analysis.7th Ed[M].New York:W.H.Freeman and Company,2007 |
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