The electrochemical behavior of Cu(II)Cu(Hg)system in aqueous sucrose solutions was studied by polarography and cyclic squarewave voltammetry.The reversible halfwave potential and the diffusion coefficients for ...The electrochemical behavior of Cu(II)Cu(Hg)system in aqueous sucrose solutions was studied by polarography and cyclic squarewave voltammetry.The reversible halfwave potential and the diffusion coefficients for Cu(II) were polarographically determined.The standard Gibbs energies of transfer of Cu(II) from water to sucrosewater solutions,ΔGt,were obtained from the reversible halfwave potentials.The measured values are negative with increasing concentration of sucrose,indicating increasing stability of Cu(II) in sucrosewater solutions.The ΔGt values were split into electrostatic and chemical contributions.The decreased chemical contribution shows that the mixtures are more basic than pure water.展开更多
Standard Gibbs energies of transfer,△Gθt,of Tl(Ⅰ)from water to aqueous sucrose and aqueous glucose solutions(mass fractions of sucrose and glucose W=0,010,020,030,040 and 050)were determined by po...Standard Gibbs energies of transfer,△Gθt,of Tl(Ⅰ)from water to aqueous sucrose and aqueous glucose solutions(mass fractions of sucrose and glucose W=0,010,020,030,040 and 050)were determined by polarography at 298±1K.In aqueous sucrose and glucose solutions containing 50×10-2mol·L-1LiClO4,the reversible halfwave potential and the diffusion coefficients for Tl(Ⅰ)were determined,respectively.Values of △Gθt,obtained from the reversible halfwave potentials vs.the ferrocene electrode scale,are negative and these decrease with increasing concentration of sucrose and glucose,indicating increasing stability of Tl(Ⅰ)in sucrosewater and glucosewater solutions.The △Gθt values were split into electrostatic and chemical contributions.The decreased chemical contribution shows that the mixtures are more basic than pure water.The experimental results were discussed in terms of solutesolvent and solutesolute interactions in the ternary systems.展开更多
文摘The electrochemical behavior of Cu(II)Cu(Hg)system in aqueous sucrose solutions was studied by polarography and cyclic squarewave voltammetry.The reversible halfwave potential and the diffusion coefficients for Cu(II) were polarographically determined.The standard Gibbs energies of transfer of Cu(II) from water to sucrosewater solutions,ΔGt,were obtained from the reversible halfwave potentials.The measured values are negative with increasing concentration of sucrose,indicating increasing stability of Cu(II) in sucrosewater solutions.The ΔGt values were split into electrostatic and chemical contributions.The decreased chemical contribution shows that the mixtures are more basic than pure water.
文摘Standard Gibbs energies of transfer,△Gθt,of Tl(Ⅰ)from water to aqueous sucrose and aqueous glucose solutions(mass fractions of sucrose and glucose W=0,010,020,030,040 and 050)were determined by polarography at 298±1K.In aqueous sucrose and glucose solutions containing 50×10-2mol·L-1LiClO4,the reversible halfwave potential and the diffusion coefficients for Tl(Ⅰ)were determined,respectively.Values of △Gθt,obtained from the reversible halfwave potentials vs.the ferrocene electrode scale,are negative and these decrease with increasing concentration of sucrose and glucose,indicating increasing stability of Tl(Ⅰ)in sucrosewater and glucosewater solutions.The △Gθt values were split into electrostatic and chemical contributions.The decreased chemical contribution shows that the mixtures are more basic than pure water.The experimental results were discussed in terms of solutesolvent and solutesolute interactions in the ternary systems.
