A PCV-modified electrode was simply prepared by dip-coating a pyrolytic graphite electrode in a NaAc-HAc buffer solution of PCV. The peak currents of differential pulse voltammograms (DPV) decrease with the addition o...A PCV-modified electrode was simply prepared by dip-coating a pyrolytic graphite electrode in a NaAc-HAc buffer solution of PCV. The peak currents of differential pulse voltammograms (DPV) decrease with the addition of Al and the peak potentials remain the same. The decreasing of Delta i(p) is linear with Al concentration in the range of 1 x 10(-8) similar to 1 x 10(-7) mol/L. The detection limit is 5 x 10(-9) mol/L and the relative standard deviation for 4 x 10(-8) mol/L Al is 2.9% (n=8). No serious interference was found. The determination of Al in water samples is reported.展开更多
A new method called differential reciprocal oscillographic chronopotentiometric titration is presented.It makes use of appearance or disappearance of a peak of depolarizer on differential reciprocal oscillogram indica...A new method called differential reciprocal oscillographic chronopotentiometric titration is presented.It makes use of appearance or disappearance of a peak of depolarizer on differential reciprocal oscillogram indicating the end point of titration.This method was applied to titration of Pb^(2+),Cd^(2+),Ni^(2+),Co^(3+),Zn^(2+),Ga^(3+) and Cu^(2+)by EDTA or EGTA.The end point of titration is very easy to observe and the sensibility of the method is higher than that of diffcrcntial oscillographic chronopotcntiometric titration.展开更多
This paper presents a computer model to investigate the buffering function of aluminum being in equilibrium with mineral kaolinite in acidic natural water. Factors affecting the theoretical pH values are discussed. Th...This paper presents a computer model to investigate the buffering function of aluminum being in equilibrium with mineral kaolinite in acidic natural water. Factors affecting the theoretical pH values are discussed. The model is verified by analyzing practical water samples.展开更多
This paper presents a new method called improved oscillographic chronopotcntiometry. It changes the incision of dE/dt-E curve into a peak shape and has the advantages of good reproducibility and wider linear range.
A novel and very sensitive electroanalytical method, based on the adsorption chronopotentiometry in the presence of cupferron, was developed for the determination of trace levels of aluminum. The working linear range ...A novel and very sensitive electroanalytical method, based on the adsorption chronopotentiometry in the presence of cupferron, was developed for the determination of trace levels of aluminum. The working linear range is 2x10(-9)-9x10(-7) mol/L and the detection limit is 1x10(-9) mol/L. It has been successfully applied to the determination of Al in various drinking-water samples.展开更多
文摘A PCV-modified electrode was simply prepared by dip-coating a pyrolytic graphite electrode in a NaAc-HAc buffer solution of PCV. The peak currents of differential pulse voltammograms (DPV) decrease with the addition of Al and the peak potentials remain the same. The decreasing of Delta i(p) is linear with Al concentration in the range of 1 x 10(-8) similar to 1 x 10(-7) mol/L. The detection limit is 5 x 10(-9) mol/L and the relative standard deviation for 4 x 10(-8) mol/L Al is 2.9% (n=8). No serious interference was found. The determination of Al in water samples is reported.
文摘A new method called differential reciprocal oscillographic chronopotentiometric titration is presented.It makes use of appearance or disappearance of a peak of depolarizer on differential reciprocal oscillogram indicating the end point of titration.This method was applied to titration of Pb^(2+),Cd^(2+),Ni^(2+),Co^(3+),Zn^(2+),Ga^(3+) and Cu^(2+)by EDTA or EGTA.The end point of titration is very easy to observe and the sensibility of the method is higher than that of diffcrcntial oscillographic chronopotcntiometric titration.
文摘This paper presents a computer model to investigate the buffering function of aluminum being in equilibrium with mineral kaolinite in acidic natural water. Factors affecting the theoretical pH values are discussed. The model is verified by analyzing practical water samples.
文摘This paper presents a new method called improved oscillographic chronopotcntiometry. It changes the incision of dE/dt-E curve into a peak shape and has the advantages of good reproducibility and wider linear range.
文摘A novel and very sensitive electroanalytical method, based on the adsorption chronopotentiometry in the presence of cupferron, was developed for the determination of trace levels of aluminum. The working linear range is 2x10(-9)-9x10(-7) mol/L and the detection limit is 1x10(-9) mol/L. It has been successfully applied to the determination of Al in various drinking-water samples.
