In this paper,the voltammetric behaviours of Ag cylinder electrode in 1 mol/dm(3) KOH solution have been investigated in the presence of ultrasound irradiation. The results based on the CV, EIS and polarization measur...In this paper,the voltammetric behaviours of Ag cylinder electrode in 1 mol/dm(3) KOH solution have been investigated in the presence of ultrasound irradiation. The results based on the CV, EIS and polarization measurements showed that ultrasound could enhance the mass transport, inhibit the oxygen evolution and increase the exchange current.展开更多
In a supporting electrolyte containing 0.6mol/L H_2SO_4,a sensitivity derivative wave of 2-AES is formed by oscillopolarography.The peak potential is-1.01V(vs.SCE),The change of peak height with the concentration of 2...In a supporting electrolyte containing 0.6mol/L H_2SO_4,a sensitivity derivative wave of 2-AES is formed by oscillopolarography.The peak potential is-1.01V(vs.SCE),The change of peak height with the concentration of 2-AES is linear in the range from 3.0×10^(-7) to 8.0×10^(-6)mol/L.The detection limit is 1.0×10^(-7)mol/L.The electrode reaction mechanism is discussed.展开更多
In the 0.3mol/L NH_4Cl supporting electrolyte,salicyl-fluorone exhibits a sensitive adsorptive wave by using linear scanning voltammetry with Ep_1=-0.70V and a diffusion wave with Ep_2=-0.68V(v8,SCE)at pH 2.5.On the s...In the 0.3mol/L NH_4Cl supporting electrolyte,salicyl-fluorone exhibits a sensitive adsorptive wave by using linear scanning voltammetry with Ep_1=-0.70V and a diffusion wave with Ep_2=-0.68V(v8,SCE)at pH 2.5.On the surface of HMDE, the adsorption of salieyl-fluorone obeys Frumkin adsorption isotherm.The adsorption coefficient(B),and attractive factor(v)and the amount of saturated adsorption(Γs)have been determined.展开更多
A greater part of water-solnble organic substances, accounting for 6070To of the total, could be adsorbedby soils, which included strongly and weekly reducing substances, positively and negatively charged substancesan...A greater part of water-solnble organic substances, accounting for 6070To of the total, could be adsorbedby soils, which included strongly and weekly reducing substances, positively and negatively charged substancesand substances containing amido. There existed a tendency of decrease in adsorption of the negativelycharged organic substances by the soil from South China to North China, with expression as Coulombianadsorption. A simultaneous reduction of iron and manganese appeared with clear voltammetric behavioursupon oxidation of water-soluble organic substances. Complexation of organic ligands with ferrons iron andmanganous manganese was proved by differential pulse voltammetric method, with disappearance of oxidationpeaks of ferrous iron and manganous manganese at 0.00 V and 0.35 V and occurrence of Fe`+-complex andMn￣2+ -complex at 0.75 V and 1.2 V respectively, whose peak potentials shifted backward.展开更多
文摘In this paper,the voltammetric behaviours of Ag cylinder electrode in 1 mol/dm(3) KOH solution have been investigated in the presence of ultrasound irradiation. The results based on the CV, EIS and polarization measurements showed that ultrasound could enhance the mass transport, inhibit the oxygen evolution and increase the exchange current.
基金The project was Supported by The National Natural Science Foundation of China
文摘In a supporting electrolyte containing 0.6mol/L H_2SO_4,a sensitivity derivative wave of 2-AES is formed by oscillopolarography.The peak potential is-1.01V(vs.SCE),The change of peak height with the concentration of 2-AES is linear in the range from 3.0×10^(-7) to 8.0×10^(-6)mol/L.The detection limit is 1.0×10^(-7)mol/L.The electrode reaction mechanism is discussed.
文摘In the 0.3mol/L NH_4Cl supporting electrolyte,salicyl-fluorone exhibits a sensitive adsorptive wave by using linear scanning voltammetry with Ep_1=-0.70V and a diffusion wave with Ep_2=-0.68V(v8,SCE)at pH 2.5.On the surface of HMDE, the adsorption of salieyl-fluorone obeys Frumkin adsorption isotherm.The adsorption coefficient(B),and attractive factor(v)and the amount of saturated adsorption(Γs)have been determined.
文摘A greater part of water-solnble organic substances, accounting for 6070To of the total, could be adsorbedby soils, which included strongly and weekly reducing substances, positively and negatively charged substancesand substances containing amido. There existed a tendency of decrease in adsorption of the negativelycharged organic substances by the soil from South China to North China, with expression as Coulombianadsorption. A simultaneous reduction of iron and manganese appeared with clear voltammetric behavioursupon oxidation of water-soluble organic substances. Complexation of organic ligands with ferrons iron andmanganous manganese was proved by differential pulse voltammetric method, with disappearance of oxidationpeaks of ferrous iron and manganous manganese at 0.00 V and 0.35 V and occurrence of Fe`+-complex andMn￣2+ -complex at 0.75 V and 1.2 V respectively, whose peak potentials shifted backward.
