摘要
目的 :将修饰电极应用于电位溶出分析 .方法 :采用化学吸附法制备出meso -四 (对 -乙基苯基 )卟啉和meso -四 (对 -甲氧基苯基 )卟啉修饰玻碳电极 .研究Zn(Ⅱ ) ,Cu(Ⅱ ) ,Cd(Ⅱ )和Pb(Ⅱ )金属离子在该电极上的电位溶出行为 ,并与预镀汞膜玻碳电极、玻碳电极的电位溶出行为进行了比较 .结果 :溶出时间 (τ)与金属离子浓度均有良好的线性关系 ,最适宜分析的浓度范围是Zn(Ⅱ ) :1× 10 - 7～ 5× 10 - 5mol/L ;Cd(Ⅱ )和Pb(Ⅱ ) :6× 10 - 7～ 5× 10 - 5mol/L ;Cu(Ⅱ ) :5× 10 - 8～2× 10 - 5mol/L .微分电位溶出分析时灵敏度提高一个数量级 ,相对标准偏差为 0 .90 %～ 2 .3% (n=15) .结论
Aim: To investigate the application of chemically modified electrodes in potentiometric stripping analysis. Methods: Stable porphyrin film modified electrodes were prepared by chemisorption of meso-tetrakis (P-ethyphenyl) porphyrin or meso-tetrakis (P-methoxyl phenyl) porphyrin in DMF solution. The potentiometric stripping behavior of Zn(Ⅱ),Cd(Ⅱ),Pb(Ⅱ) and Cu(Ⅱ) using the modified electrodes was studied. The results obtained using porphyrin film electrodes were compared with those using glassy carbon electrodes and mercury film glassy carbon electrodes. Results: The stripping times and concentrations of Zn(Ⅱ), Cd(Ⅱ), Pb(Ⅱ), and Cu(Ⅱ) were good linear relationship within the ranges of 1×10 -7 ～5×10 -5 mol/L for Zn(Ⅱ), 6×10 -7 ～5×10 -5 mol/L for Cd(Ⅱ) and Pb(Ⅱ), and 5×10 -8 ～2×10 -5 mol/L for Cu(Ⅱ). The relative standard deviation of the stripping times at the metal ions concentration of 1×10 -6 mol/L was 0.90%～2.3% ( n =15)using the same electrode. Conclusion: In potentiometric stripping analysis, excellent repeatability and satisfactory sensitivity can be obtained using porphyrin film modified electrodes. [
出处
《暨南大学学报（自然科学与医学版）》
CAS
CSCD
2001年第3期71-76,共6页
Journal of Jinan University(Natural Science & Medicine Edition)
