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A new type of current sensor, Langmuir -Blodgett (LB) film of calixarene on the surface of glassy carbon electrode (GCE) was prepared for determination of mercury by anodic stripping voltammetry (ASV). An anodic stripping peak was obtained at 0.15 V (vs. SCE) by scanning the potential from À 0.6 to þ 0.6 V. Compared with a bare GCE, the LB film coated electrode greatly improves the sensitivity of measuring mercury ion. The fabricated electrode in a 0.1 M H 2 SO 4 þ 0.01 M HCl solution shows a linear voltammetric response in the range of 0.07 -40 mg L À1 and detection limit of 0.04 mg L À1 (ca. 2 Â 10 À10 M). The high sensitivity, selectivity, and stability of this LB film modified electrode demonstrates its practical application for a simple, rapid and economical determination of Hg 2þ in a water sample.

A new type of voltammetric sensor, Langmuir -Blodgett film of p-tert-butylthiacalix[4]arene modified glassy carbon electrode, was advanced and used for determining copper at trace levels by differential pulse stripping voltammetry. Calibration plot was found to be linear in the range of 2 Â 10 À8 M to 5 Â 10 À6 M; the detection limit was 2 Â 10 À9 M. Possible recognition mechanism was also discussed. From determination of Copper in real samples (river, lake and tap water) it can be concluded that the method is rapid, sensitive in determining of copper and can be used in the analysis of natural water samples.