The electrochemical behavior of rhein modified glassy carbon electrodes were studied. Three peaks in CV appeared in the potential rang of +0.4\-0.8 V\%（vs\%. Ag/AgCl） in 0.06 mol/L H\-2SO\-4. p\-1 and p\-3 are a cou...The electrochemical behavior of rhein modified glassy carbon electrodes were studied. Three peaks in CV appeared in the potential rang of +0.4\-0.8 V\%（vs\%. Ag/AgCl） in 0.06 mol/L H\-2SO\-4. p\-1 and p\-3 are a couples of oxidation\|reduction peak, the electrode process contains two electrons and two protons. The formal potential（\%E\%\+\{o\} ）is -0.202 V（\%vs\%. Ag/AgCl） at the scanning rate of 50 mV/s. The cathodic peak potential shifts linearly in the negative direction with increasing solution pH with a slope of 67 mV per pH unit. The rhein modified electrode shows an electrocatalytic activity for reduction of hemoglobin in 0.06 mol/L H\-2SO\-4 solution. The peak currents are proportional to the concentrations of the hemoglobin in the range of 6.0×10\+\{-8\}\1.3×10\+\{-6\} mol/L, the relative standard deviation is 3.5% for 6 successive determination of 1.0×10\+\{-7\} mol/L hemoglobin solution. The catalytic mechanism has been discussed.展开更多
文摘The electrochemical behavior of rhein modified glassy carbon electrodes were studied. Three peaks in CV appeared in the potential rang of +0.4\-0.8 V\%（vs\%. Ag/AgCl） in 0.06 mol/L H\-2SO\-4. p\-1 and p\-3 are a couples of oxidation\|reduction peak, the electrode process contains two electrons and two protons. The formal potential（\%E\%\+\{o\} ）is -0.202 V（\%vs\%. Ag/AgCl） at the scanning rate of 50 mV/s. The cathodic peak potential shifts linearly in the negative direction with increasing solution pH with a slope of 67 mV per pH unit. The rhein modified electrode shows an electrocatalytic activity for reduction of hemoglobin in 0.06 mol/L H\-2SO\-4 solution. The peak currents are proportional to the concentrations of the hemoglobin in the range of 6.0×10\+\{-8\}\1.3×10\+\{-6\} mol/L, the relative standard deviation is 3.5% for 6 successive determination of 1.0×10\+\{-7\} mol/L hemoglobin solution. The catalytic mechanism has been discussed.
