Trace amount of cobalt in molecular sieve was determined by simple differentialoscillographic voltammtry in Co-PAR system (PAR= 4-(2-pyridylazo) resorcinol). Resultsshowed that in a solution of 0. 2 mol/L HAc-0. 2 mol...Trace amount of cobalt in molecular sieve was determined by simple differentialoscillographic voltammtry in Co-PAR system (PAR= 4-(2-pyridylazo) resorcinol). Resultsshowed that in a solution of 0. 2 mol/L HAc-0. 2 mol/L NaAc-2. 5 ×10-5 mol/L PAR (pH=4. 7) cobalt was able to cause a sharp incision on the cathodeic branch of the oscillogram at- 1. 68 V(vs. SCE). The method is simple, rapid and has less interferences than spectropho-tometry.展开更多
Pyrrolidine dithiocarbamic ammonium can cause a sensitive incision on the cathodic branch of dE/dt-E oscillogram at -0.80 V(vs.SCE) in 0.1 mol/L KCl solution. When Co. 2+、Ni. 2+、Cd. 2+、Ga. 3+ and In. 3+ are present...Pyrrolidine dithiocarbamic ammonium can cause a sensitive incision on the cathodic branch of dE/dt-E oscillogram at -0.80 V(vs.SCE) in 0.1 mol/L KCl solution. When Co. 2+、Ni. 2+、Cd. 2+、Ga. 3+ and In. 3+ are present in KCl solution containing pyrrolidine dithiocarbamic ammonium the depth of the incision varies. A linear relationship between the incision depth and concentration of the metal ions is established and the second-order differential simple oscillographic voltammetry is applied to quantitative determination for these ions. The cobalt ion in molecular sieve is also determined with satisfactory results.展开更多
文摘Trace amount of cobalt in molecular sieve was determined by simple differentialoscillographic voltammtry in Co-PAR system (PAR= 4-(2-pyridylazo) resorcinol). Resultsshowed that in a solution of 0. 2 mol/L HAc-0. 2 mol/L NaAc-2. 5 ×10-5 mol/L PAR (pH=4. 7) cobalt was able to cause a sharp incision on the cathodeic branch of the oscillogram at- 1. 68 V(vs. SCE). The method is simple, rapid and has less interferences than spectropho-tometry.
文摘Pyrrolidine dithiocarbamic ammonium can cause a sensitive incision on the cathodic branch of dE/dt-E oscillogram at -0.80 V(vs.SCE) in 0.1 mol/L KCl solution. When Co. 2+、Ni. 2+、Cd. 2+、Ga. 3+ and In. 3+ are present in KCl solution containing pyrrolidine dithiocarbamic ammonium the depth of the incision varies. A linear relationship between the incision depth and concentration of the metal ions is established and the second-order differential simple oscillographic voltammetry is applied to quantitative determination for these ions. The cobalt ion in molecular sieve is also determined with satisfactory results.
