The color reaction of Cadmium(Ⅱ) with 3,3′,5,5′-TBDP B DAA has been studied.The results show that in Na 2B 4O 7 NaOH buffer medium of pH10～11 and in the presence of Tween 80,Cadmium(Ⅱ) reacts with 3,3′,5,5′-TBD...The color reaction of Cadmium(Ⅱ) with 3,3′,5,5′-TBDP B DAA has been studied.The results show that in Na 2B 4O 7 NaOH buffer medium of pH10～11 and in the presence of Tween 80,Cadmium(Ⅱ) reacts with 3,3′,5,5′-TBDP B DAA to form a purplish red complex with molar ratio of 1∶2.The complex exhibits maximum absorption at 520nm with a molar absorptivity of 1.98×10 5L·mol -1 ·cm -1 .Beer’s law can be applicable in the range of 0～25μg/25ml Cd(Ⅱ).The method has been applied to the determination of micro amounts of Cadmium(Ⅱ) in vegetable,rice and other biological samples with satisfactory results.展开更多
The differential pulse voltarametric ( DPV ) method with a glassy carbon electrode was used for the determination of 3,3' 5,5'-tetramethy lbenzidine ( TMB ) , o-tolidine and benzidine in the acidic media. The ...The differential pulse voltarametric ( DPV ) method with a glassy carbon electrode was used for the determination of 3,3' 5,5'-tetramethy lbenzidine ( TMB ) , o-tolidine and benzidine in the acidic media. The pulse amplitude, interval time and scan rate of DPV are optimized to be 50 mV, 0.5 s and 10 mV/s, respectively, The peak current is proportional to the concentration of TMB and its analogues, the linear range is from 10^-8mol/l to 10^-4 mal/l, The electrochemical behaviour of the compounds is discussed, The chemical poisons can be determined directly, or indirectly by the extraction in the waste water of chemical industry and laboratory,展开更多
文摘The color reaction of Cadmium(Ⅱ) with 3,3′,5,5′-TBDP B DAA has been studied.The results show that in Na 2B 4O 7 NaOH buffer medium of pH10～11 and in the presence of Tween 80,Cadmium(Ⅱ) reacts with 3,3′,5,5′-TBDP B DAA to form a purplish red complex with molar ratio of 1∶2.The complex exhibits maximum absorption at 520nm with a molar absorptivity of 1.98×10 5L·mol -1 ·cm -1 .Beer’s law can be applicable in the range of 0～25μg/25ml Cd(Ⅱ).The method has been applied to the determination of micro amounts of Cadmium(Ⅱ) in vegetable,rice and other biological samples with satisfactory results.
文摘The differential pulse voltarametric ( DPV ) method with a glassy carbon electrode was used for the determination of 3,3' 5,5'-tetramethy lbenzidine ( TMB ) , o-tolidine and benzidine in the acidic media. The pulse amplitude, interval time and scan rate of DPV are optimized to be 50 mV, 0.5 s and 10 mV/s, respectively, The peak current is proportional to the concentration of TMB and its analogues, the linear range is from 10^-8mol/l to 10^-4 mal/l, The electrochemical behaviour of the compounds is discussed, The chemical poisons can be determined directly, or indirectly by the extraction in the waste water of chemical industry and laboratory,
