A new zeolite modified electrode was prepared by using zeolite/polyvinyl as amodifier on GCE. The anodic stripping voltammograms of Ph2+ on ZPE is caused by zeoliteselective adsorption to Pb. The linear range of Ph2+ ...A new zeolite modified electrode was prepared by using zeolite/polyvinyl as amodifier on GCE. The anodic stripping voltammograms of Ph2+ on ZPE is caused by zeoliteselective adsorption to Pb. The linear range of Ph2+ in 0. 5 mol/L KCl(pH=2. 0) solution is1. 0 × 10-6～ 1. 0 × 10-3 mol/L with 0. 999 correlation coefficient (n ＝ 6). The relativestandard deviation of the response to 4. 0 × 10-6 mol/L Pb2+ on ZPE which has been repeatedlyproduced for ten times is 2. 5 %. The detection limit is 3. 0× 10-7 mol/L Pb2+. To the 1. 0×10-6 mol/L Ph2+, 1 000 times A13+, Na+, K+, CI-, SO, NO3-, Hg2+, 100 times Ni2+,Co2+, Cu2+, Zn2+, Cd2+, Mn2+ and 10 times Ca2+, Fe3+, Mo6+, Cr3+ do not disturb theanalysis. The ZPE shows a high selectivity, sensitivity and a desired reproducibility. Itssensitivity dropped to 90% of the original value after it had been continuously used for thousandtimes.展开更多
In this paper, the procedure of preparation of graphite-Teflon composite electrode(GTE) by coating was investigated. The coating consisted of a solid mixture 2.5 g(graphite45%, Teflon 45% and PVC 10%) mixed with a sol...In this paper, the procedure of preparation of graphite-Teflon composite electrode(GTE) by coating was investigated. The coating consisted of a solid mixture 2.5 g(graphite45%, Teflon 45% and PVC 10%) mixed with a solvent (THF: DMF=1:4 in volume) 0. 8mL. Copper wires(=0. 7 mm) were coated by the coating and heated at 200℃ for 5 min,and the GTEs were finished. They could be modified and changed into other metallic Tefloncomposite electrode only by electroplating in correspondent plating bath, such as mercury-cobalt- or copper- Teflon composite electrode. They had been applled to flow injection analy-sis by techniques of electrochemitry successfully.展开更多
文摘A new zeolite modified electrode was prepared by using zeolite/polyvinyl as amodifier on GCE. The anodic stripping voltammograms of Ph2+ on ZPE is caused by zeoliteselective adsorption to Pb. The linear range of Ph2+ in 0. 5 mol/L KCl(pH=2. 0) solution is1. 0 × 10-6～ 1. 0 × 10-3 mol/L with 0. 999 correlation coefficient (n ＝ 6). The relativestandard deviation of the response to 4. 0 × 10-6 mol/L Pb2+ on ZPE which has been repeatedlyproduced for ten times is 2. 5 %. The detection limit is 3. 0× 10-7 mol/L Pb2+. To the 1. 0×10-6 mol/L Ph2+, 1 000 times A13+, Na+, K+, CI-, SO, NO3-, Hg2+, 100 times Ni2+,Co2+, Cu2+, Zn2+, Cd2+, Mn2+ and 10 times Ca2+, Fe3+, Mo6+, Cr3+ do not disturb theanalysis. The ZPE shows a high selectivity, sensitivity and a desired reproducibility. Itssensitivity dropped to 90% of the original value after it had been continuously used for thousandtimes.
文摘In this paper, the procedure of preparation of graphite-Teflon composite electrode(GTE) by coating was investigated. The coating consisted of a solid mixture 2.5 g(graphite45%, Teflon 45% and PVC 10%) mixed with a solvent (THF: DMF=1:4 in volume) 0. 8mL. Copper wires(=0. 7 mm) were coated by the coating and heated at 200℃ for 5 min,and the GTEs were finished. They could be modified and changed into other metallic Tefloncomposite electrode only by electroplating in correspondent plating bath, such as mercury-cobalt- or copper- Teflon composite electrode. They had been applled to flow injection analy-sis by techniques of electrochemitry successfully.
