Department of Chemistry, Liaoning University, Shenyang 110036, China.
Anal Chim Acta. 2012 Aug 13;738:41-4. doi: 10.1016/j.aca.2012.06.009. Epub 2012 Jun 14.
Hydrogen evolution bothers stripping analysis significantly. Dioctyl phthalate-based carbon paste electrode exhibits extremely wide cathodic potential window. It is explored as a powerful substrate electrode to solve the problem of hydrogen evolution and further improve reproducibility for stripping analysis using bismuth-coated electrodes for the first time. It was successfully applied to the simultaneous determination of Zn(2+), Cd(2+), and Pb(2+). Linear responses are obtained for Zn(2+) in the range of 10-100μgL(-1) and for Pb(2+) and Cd(2+) in the range of 5-100μgL(-1). The detection limits for Zn(2+), Cd(2+), and Pb(2+) are 0.1μgL(-1), 0.22μgL(-1) and 0.44μgL(-1), respectively. The method has been successfully applied to the determination of Zn(2+), Cd(2+), and Pb(2+) in waste water samples. The detection strategy based on the combination of dioctyl phthalate-based carbon paste electrode and bismuth-coated electrodes holds great promise for stripping analysis.
氢的析出对示波极谱分析影响较大。基于邻苯二甲酸二辛酯的碳糊电极具有非常宽的阴极电势窗口。首次将其作为一种强大的基底电极来解决氢析出问题，并进一步提高了示波极谱分析的重现性。该电极成功应用于同时测定 Zn(2+)、Cd(2+)和 Pb(2+)。Zn(2+)在 10-100μgL(-1)范围内、Pb(2+)和 Cd(2+)在 5-100μgL(-1)范围内呈现出良好的线性响应。Zn(2+)、Cd(2+)和 Pb(2+)的检测限分别为 0.1μgL(-1)、0.22μgL(-1)和 0.44μgL(-1)。该方法已成功应用于废水样品中 Zn(2+)、Cd(2+)和 Pb(2+)的测定。基于邻苯二甲酸二辛酯碳糊电极和铋涂层电极结合的检测策略在示波极谱分析中具有广阔的应用前景。
