Determination of thallium and cadmium on a chemically modified electrode with Langmuir–Blodgett film of p-allylcalix[4]arene

A glassy carbon electrode (GCE) coated with Langmuir–Blodgett (LB) film of p-allylcalix[4]arene is described for simultaneous determination of traces of thallium and cadmium in environmental water. The LB film electrode in a 0.1 M KH2PO4 solution shows a linear voltammetric response in the range of 5–250 μg l−1 for thallium and 10–300 μg l−1 for cadmium. The detection limits of thallium(I) and cadmium(II) are estimated to be 1.0 μg l−1 (ca. 5.0 × 10−9 M) and 2.2 μg l−1 (ca. 2.0 × 10−8 M), respectively. Above all, the indium does not respond to this LB film electrode.