An electrochemical method for the simultaneous determination of lead(II)and Cadmium(II)with a calix[6]arene modified carbon paste electrode(CPE)has been developed.Pb^(2+)and Cd^(2+)were accumulated at the surface of t...An electrochemical method for the simultaneous determination of lead(II)and Cadmium(II)with a calix[6]arene modified carbon paste electrode(CPE)has been developed.Pb^(2+)and Cd^(2+)were accumulated at the surface of the modified electrode via formation of chemical complexes with calix[6]arene,and reduced at 1.40 V.During the following anodic potential sweep,reduced lead and cadmium were oxidized,and two well-defined striping peaks appeared at about?0.60 V and?0.84 V.Compared with a bare carbon paste electrode,the calix[6]arene modified CPE greatly improves the sensitivity of determining lead and cadmium.The stripping peak currents change linearly with the concentration of Pb^(2+)3.0×10^(-8)–8.0×10^(-6)mol·L^(-1).and with that of Cd^(2+)6.0×10^(-8)–1.0×10^(-5)mol·L^(-1).The detection limits of Pb^(2+)and Cd^(2+)are found to be 8.0×10?9 mol·L?1 and 2.0×10^(-8)mol·L?1,respectively.The modified carbon paste electrode was applied to determine trace levels of lead and cadmium in water samples.Comparing with that of atomic absorption spectrometry,the results suggests that the calix[6]arene modified CPE has great potential for the practical sample analysis.展开更多
An electroanalytical method for the determination of ammonium ion using a platinized platinum electrode is described.Under optimized analytical conditions,the linear range of the calibration graphs for ammonium ion is...An electroanalytical method for the determination of ammonium ion using a platinized platinum electrode is described.Under optimized analytical conditions,the linear range of the calibration graphs for ammonium ion is 3.0×10^(-5)-5.0×10^(-3)mol·L^(-1)with a detection limit of 5.0×10^(-6)mol·L^(-1).The method has been applied to the determination of ammonium ion in lake water samples and recoveries of 100%–103%are obtained.The results obtained are found to be in good agreement with spectrophotometric results.展开更多
基金Supported by the National Natural Science Foundation of China(60171023)
文摘An electrochemical method for the simultaneous determination of lead(II)and Cadmium(II)with a calix[6]arene modified carbon paste electrode(CPE)has been developed.Pb^(2+)and Cd^(2+)were accumulated at the surface of the modified electrode via formation of chemical complexes with calix[6]arene,and reduced at 1.40 V.During the following anodic potential sweep,reduced lead and cadmium were oxidized,and two well-defined striping peaks appeared at about?0.60 V and?0.84 V.Compared with a bare carbon paste electrode,the calix[6]arene modified CPE greatly improves the sensitivity of determining lead and cadmium.The stripping peak currents change linearly with the concentration of Pb^(2+)3.0×10^(-8)–8.0×10^(-6)mol·L^(-1).and with that of Cd^(2+)6.0×10^(-8)–1.0×10^(-5)mol·L^(-1).The detection limits of Pb^(2+)and Cd^(2+)are found to be 8.0×10?9 mol·L?1 and 2.0×10^(-8)mol·L?1,respectively.The modified carbon paste electrode was applied to determine trace levels of lead and cadmium in water samples.Comparing with that of atomic absorption spectrometry,the results suggests that the calix[6]arene modified CPE has great potential for the practical sample analysis.
基金Supported by the National Natural Science Foundation of China(60171023)
文摘An electroanalytical method for the determination of ammonium ion using a platinized platinum electrode is described.Under optimized analytical conditions,the linear range of the calibration graphs for ammonium ion is 3.0×10^(-5)-5.0×10^(-3)mol·L^(-1)with a detection limit of 5.0×10^(-6)mol·L^(-1).The method has been applied to the determination of ammonium ion in lake water samples and recoveries of 100%–103%are obtained.The results obtained are found to be in good agreement with spectrophotometric results.
