A polarographic catalytic wave of cobalt in the substrate solution (pH=8.5) of diacetyldioxime potassium pyrophosphate ammonium chloride was studied and a new method for rapid determination of trace cobalt in complex ...A polarographic catalytic wave of cobalt in the substrate solution (pH=8.5) of diacetyldioxime potassium pyrophosphate ammonium chloride was studied and a new method for rapid determination of trace cobalt in complex zinc electrolyte solution was developed. The results show that there is a very sensitive catalytic wave of cobalt at 1.23 V. At least three hundred thousand fold Zn 2+ does not affect the determination of cobalt. The method is easy to operate and rapid, and when the signal to noise rate equals 2, the detection limit is 6×10 -9 mol·L -1 . A good linear relationship exists between the concentration of cobalt within 0.001 ～3.0 μg·mL -1 and the peak current. The method has successfully been used in the determination of trace cobalt in complex solution of the workshop for electrolyzing zinc.展开更多
The electroanalytical method of ferriheme was studied by linear sweep voltammetry in medium of 0.05 mol/L Tris+0.05 mol/L NH3?NH4Cl buffer at hang mercury drop electrodes (HMDE). Heme exhibits two pair reversible redo...The electroanalytical method of ferriheme was studied by linear sweep voltammetry in medium of 0.05 mol/L Tris+0.05 mol/L NH3?NH4Cl buffer at hang mercury drop electrodes (HMDE). Heme exhibits two pair reversible redox peaks and one irreversible peak. The cathodic peak potentials are?;0.236 V, ?0.422 V and ?1.408 V respectively. The first and the third peaks can be used for directly quantitative determination of heme concentrations. The peak currents are good linear relationship with heme concentration in ranges of 3×10?6–6×10?5 mol/L and 3×10?7–1.5×10?5 mol/L respectively.展开更多
基金The Science and Research Foundation of Education Commission of Hunan Province!(No.98C118)
文摘A polarographic catalytic wave of cobalt in the substrate solution (pH=8.5) of diacetyldioxime potassium pyrophosphate ammonium chloride was studied and a new method for rapid determination of trace cobalt in complex zinc electrolyte solution was developed. The results show that there is a very sensitive catalytic wave of cobalt at 1.23 V. At least three hundred thousand fold Zn 2+ does not affect the determination of cobalt. The method is easy to operate and rapid, and when the signal to noise rate equals 2, the detection limit is 6×10 -9 mol·L -1 . A good linear relationship exists between the concentration of cobalt within 0.001 ～3.0 μg·mL -1 and the peak current. The method has successfully been used in the determination of trace cobalt in complex solution of the workshop for electrolyzing zinc.
文摘The electroanalytical method of ferriheme was studied by linear sweep voltammetry in medium of 0.05 mol/L Tris+0.05 mol/L NH3?NH4Cl buffer at hang mercury drop electrodes (HMDE). Heme exhibits two pair reversible redox peaks and one irreversible peak. The cathodic peak potentials are?;0.236 V, ?0.422 V and ?1.408 V respectively. The first and the third peaks can be used for directly quantitative determination of heme concentrations. The peak currents are good linear relationship with heme concentration in ranges of 3×10?6–6×10?5 mol/L and 3×10?7–1.5×10?5 mol/L respectively.
