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
DFT and AM1 methods were used to study the reaction of OH radical with hexachlorobenzene(HCB). The optimized structures of the reactants, the products and the transition states were found. A reasonable reaction path w...DFT and AM1 methods were used to study the reaction of OH radical with hexachlorobenzene(HCB). The optimized structures of the reactants, the products and the transition states were found. A reasonable reaction path was determined through IRC calculations. The activation energy obtained is in good agreement to the experimental value.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DFT and AM1 methods were used to study the reaction of OH radical with hexachlorobenzene(HCB). The optimized structures of the reactants, the products and the transition states were found. A reasonable reaction path was determined through IRC calculations. The activation energy obtained is in good agreement to the experimental value.
