Simultaneous Determination of Thallium and Lead...

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 Tlþ and Pb2þ by square-wave anodic stripping voltammetry. Under the optimum experimental conditions, this newly developed sensor reveal good linear response for Tlþ and Pb2þ in the concentration range of 3108–4106 mol L1 and 2107–2105 mol L1 respectively. The detect limits are 2108 mol L1 for Tlþ and 8108 mol L1 for Pb2þ. Using proposed method, Tlþ and Pb2þ in environment samples were determined with satisfactory results. Keywords: Calixarenes, Langmuir – Blodgett, Thallium, Lead, Square-wave anodic stripping voltammetry