In the buffer of the pH from 5.5 to 6.5,in order to attain the goal of separating cuprum matrix,Cu(Ⅱ) is reducted to Cu(Ⅰ) by sodium thiosulfate,Zn(Ⅱ) is extracted by the system of 0.05 mol/L PMBP-benzence.
The HPLC system consisted of Inertsil ODS-3 Column(Diamonsil 4.6 mm×250mm,5um) with the mobile phase of acetonitrile:0.2moL·L~(-1)anhydrous citric acid(pH3.0) :water(D-phenylalanine0.15g and cupric chloride 0.15g ·100moL ~(-1))=(8∶1∶92).
A C18 column was used with the mobile phase of methanol-water(containing 2mmol/L N-L-α-aspartyl-L-phenylalanine-1-methyl ester, 1mmol/L cupric acetate and 2mmol/L sodium 1-octanesulfonate)(60:40). The detection wavelength was 254nm.
The absorbance measued by spectrophotometer at 740nm was plotted against the different molar concentration of cupric salt in pH=10 aqueous solution of Cu~(2+)-PVA. The range of the determination of CuCl_2·2H_2O is 15～50 mg/100ml.
The copper complexes of the above ligands were used in catalytic asymmetrical Henry reactions.
Comparison of antibacterial ability of copper and stainless steel
In this paper, the electro-analysis and spectrophotometric analysis methods were used to study the antibacterial ability of copper and stainless steel materials.
coli) and photo-bacteria were used as samples, the antibacterial effect of stainless steel was very weak, while the percentage of bacteria dying from exposure to metallic copper for 30 min was over 90%.
The antibacterial ability of copper has a potential application in the field of disinfection, food packaging and piping of drinking water.
Using the cross-linking agent cupric-phenanthroline, it was shown that in SR membranes of hibernating ground squirrels Ca-ATPase is present in a more aggregated state.
A linear logarithmic dependence of the electrical resistance of glasses and glass-ceramics in semiconductor chalcogenide systems in cupric salt solutions on the cation content in the solution is established for the first time.
Although potassium ions were found to lower the reducibility of the cupric oxide species, the oxidation rate of carbon black increased in the presence of K/oxide and K-Cu/oxide.
The activation effect is attributed to cuprous ions that form as an intermediate product in the course of electrochemical reduction of cupric cations.
Numerical Solution of the Problem of the Limiting Current for the Copper Electrodeposition from a Solution of Cupric Sulfate and