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
Inclusion action of rhein with CDs was studied by linear sweep oscilloscope polarography. The molar ratio of inclusion complexes of rhein with CDs are 11, the inclusion constants in different temperature have been d...Inclusion action of rhein with CDs was studied by linear sweep oscilloscope polarography. The molar ratio of inclusion complexes of rhein with CDs are 11, the inclusion constants in different temperature have been determined and the thermodynamics parameter of some inclusion complexes have also been obtained. It indicates that in normal temperature, the inclusion procedure go on spontaneously, improving temperature is unfavorable to the formation of inclusion complexes.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.
文摘Inclusion action of rhein with CDs was studied by linear sweep oscilloscope polarography. The molar ratio of inclusion complexes of rhein with CDs are 11, the inclusion constants in different temperature have been determined and the thermodynamics parameter of some inclusion complexes have also been obtained. It indicates that in normal temperature, the inclusion procedure go on spontaneously, improving temperature is unfavorable to the formation of inclusion complexes.
