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Simultaneous Determination of Cd2+

2010; Wiley; Volume: 31; Issue: 10 Linguagem: Inglês

10.5012/bkcs.2010.31.10.2949

1229-5949

Penghui Zhang, Sheying Dong, Guang-Zhe GU, Tinglin Huang,

Analytical Chemistry and Sensors

Ionic liquid-functionalized ordered mesoporous silica SBA-15 modified carbon paste electrode (CISPE) was fabricated and its electrochemical performance was investigated by cyclic voltammetry, electrochemical impedance spectra. The electrochemical behavior of $Cd^{2+}$ , $Pb^{2+}$ , $Cu^{2+}$ and $Hg^{2+}$ at CISPE was studied by differential pulse anodic stripping voltammetry (DPASV). Compared with carbon paste electrode, the stripping peak currents had a significant increase at CISPE. Under the optimized conditions, the detection limits were $8.0{\times}10^{-8}\;M$ ( $Cd^{2+}$ ), $4.0{\times}10^{-8}\;M$ ( $Pb^{2+}$ ), $6.0{\times}10^{-8}\;M$ ( $Cu^{2+}$ ), $1.0{\times}10^{-8}\;M$ ( $Hg^{2+}$ ), respectively. Furthermore, the present method was applied to the determination of $Cd^{2+}$ , $Pb^{2+}$ , $Cu^{2+}$ and $Hg^{2+}$ in water samples and people hair sample.