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A glassy carbon electrode (GCE) modified with 2,2':6':2"-terpyridine (2,2':6':2"-TPR) using a spin coating method was applied for the highly selective and sensitive analysis of a trace amount of Hg 2 2 + ions. Various experimental parameters, which influenced the response of the 2,2':6':2"-TPR modified electrode to Hg 2 2 + ions, were optimized. The linear sweep and differential pulse voltammograms for the 2,2':6':2"-TPR modified electrode deposited with Hg show a well-defined anodic peak at +0.65 V (vs. Ag‖AgCl). After a 25 min preconcentration time in an Hg 2 2 + ion solution (0.1 M acetate buffer, pH 5.0), differential pulse voltammetry (DPV) with 2,2':6':2"-TPR modified electrode shows a linear response between 1.0 x 10 - 6 M and 2.0 x 10 - 7 M. The least-square treatment of these data produce an equation of I [μA] = 0.031 + 0.005 C with r = 0.980 (n = 5). The detection limit of this electrode with linear sweep voltammetry and differential pulse anodic voltammetry were 2.0 x 10 - 6 M and 8.0 x 10 - 8 M, respectively. The presence of Pb, Fe, Cd, Ti, Ni, Co, Mg, Al, Mn, and Zn did not interfere in the analysis of the Hg 2 2 + ion. The 2,2':6':2"-TPR modified GCE has been successfully applied in determination trace amounts of Hg in a human urine sample.

Determination of Hg22+Ions Using a Modified Glassy Carbon Electrode with 2,2':6':2''-Terpyridine

Determination of Hg₂²⁺Ions Using a Modified Glassy Carbon Electrode with 2,2':6':2''-Terpyridine