Simultaneous Determination of Thallium and Lead on a Chemically Modified Electrode with Langmuir– Blodgett Film of a p ‐tert‐Butylcalix[4]arene Derivative

A new voltammetric sensor, Langmuir–Blodgett (LB) film of a p‐tert ‐butylcalix[4]arene derivative modified glassy carbon electrode, was designed and successfully used in simultaneous determination of Tl + and Pb 2+ by square‐wave anodic stripping voltammetry. Under the optimum experimental conditions, this newly developed sensor reveal good linear response for Tl + and Pb 2+ in the concentration range of 3×10 −8 –4×10 −6  mol L −1 and 2×10 −7 –2×10 −5  mol L −1 respectively. The detect limits are 2×10 −8  mol L −1 for Tl + and 8×10 −8  mol L −1 for Pb 2+ . Using proposed method, Tl + and Pb 2+ in environment samples were determined with satisfactory results.