A novel method for determination of sulfide ion in water was described by screen-printed electrochemical sensor.The electrochemical behavior of N,N-dimethylphenylenediamine and catalytic oxidation of sulfide ion were ...A novel method for determination of sulfide ion in water was described by screen-printed electrochemical sensor.The electrochemical behavior of N,N-dimethylphenylenediamine and catalytic oxidation of sulfide ion were studied.There was an excellent linear response range from 8.0×10-7 to 6.5×10-4mol/L（R=0.997）for the detection of sulfide ion,with a detection limit of 3.0×10-7mol/L.The method is simple,rapid,cheap and accurate.展开更多
Four isothermal sections at 298.15K,308.15K,318.15K and 328.15K in system water-n-hexane-ethanol were measured by gas chromatograph method.The innerscaling method was used to determine the concentrations of n-hexane a...Four isothermal sections at 298.15K,308.15K,318.15K and 328.15K in system water-n-hexane-ethanol were measured by gas chromatograph method.The innerscaling method was used to determine the concentrations of n-hexane and ethanol in this ternary system.Ethy1 acetate was chosen as the sample of inner-scaling because of its separability and fit retainning time.Acetylacetone was chosen as diluent of the oil phase andn-butyl alcohol was chosen as diluent of the water phase.The experimental data of four isothermal sections at 298.15K,308.15K,318.15K adn 328.15K in system water-n-hexane-ethanol at normal pressure were given.Four schematic figures were also given.The character of these phase diagrams was analysed.They were compared with the phase diagram of system water-n-hexane-methanol.The possible causes of experimental error were discussed.The root mean square error of measurement is 1.47%.展开更多
文摘A novel method for determination of sulfide ion in water was described by screen-printed electrochemical sensor.The electrochemical behavior of N,N-dimethylphenylenediamine and catalytic oxidation of sulfide ion were studied.There was an excellent linear response range from 8.0×10-7 to 6.5×10-4mol/L（R=0.997）for the detection of sulfide ion,with a detection limit of 3.0×10-7mol/L.The method is simple,rapid,cheap and accurate.
文摘Four isothermal sections at 298.15K,308.15K,318.15K and 328.15K in system water-n-hexane-ethanol were measured by gas chromatograph method.The innerscaling method was used to determine the concentrations of n-hexane and ethanol in this ternary system.Ethy1 acetate was chosen as the sample of inner-scaling because of its separability and fit retainning time.Acetylacetone was chosen as diluent of the oil phase andn-butyl alcohol was chosen as diluent of the water phase.The experimental data of four isothermal sections at 298.15K,308.15K,318.15K adn 328.15K in system water-n-hexane-ethanol at normal pressure were given.Four schematic figures were also given.The character of these phase diagrams was analysed.They were compared with the phase diagram of system water-n-hexane-methanol.The possible causes of experimental error were discussed.The root mean square error of measurement is 1.47%.
