Saffron in aqueous solution was studied via electrochemical analysis with KCl as a supporting electrolyte using cyclic voltammetric technique to determine the redox current peaks at different concentration,pH and scan...Saffron in aqueous solution was studied via electrochemical analysis with KCl as a supporting electrolyte using cyclic voltammetric technique to determine the redox current peaks at different concentration,pH and scan rate(SR).It was found that an oxidation current peak appeared at potential+268 mV and two reduction current peaks at−282 and−850 mV.The oxidation current peak of saffron disappeared in alkaline medium at pH=12.An enhancement was observed in acidic medium at pH=6.Based on Randel equations and by using different scan rates,the diffusion coefficient(D_(f))for oxidation-reduction current peaks of saffron in KCl solution was determined with nearly equal values as of 1.87×10^(−5) and 1.12×10^(−5) cm^(2)/s,respectively.The results indicate a low detection limit of the different concentrations of saffron in KCl solution as determined from the calibration graph,and a high reliability revealed by the relative standard deviation(RSD).Stability of the GCE for oxidationreduction current peaks was recorded as±7.12%and±1.04%,respectively.展开更多
文摘Saffron in aqueous solution was studied via electrochemical analysis with KCl as a supporting electrolyte using cyclic voltammetric technique to determine the redox current peaks at different concentration,pH and scan rate(SR).It was found that an oxidation current peak appeared at potential+268 mV and two reduction current peaks at−282 and−850 mV.The oxidation current peak of saffron disappeared in alkaline medium at pH=12.An enhancement was observed in acidic medium at pH=6.Based on Randel equations and by using different scan rates,the diffusion coefficient(D_(f))for oxidation-reduction current peaks of saffron in KCl solution was determined with nearly equal values as of 1.87×10^(−5) and 1.12×10^(−5) cm^(2)/s,respectively.The results indicate a low detection limit of the different concentrations of saffron in KCl solution as determined from the calibration graph,and a high reliability revealed by the relative standard deviation(RSD).Stability of the GCE for oxidationreduction current peaks was recorded as±7.12%and±1.04%,respectively.
