Improvement in performance of a flow electrochemical sensor by using carbamoyl-arms polyazamacrocycle for the preconcentration of lead ions onto the electrode - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Electrochemistry Communications Année : 2010

Improvement in performance of a flow electrochemical sensor by using carbamoyl-arms polyazamacrocycle for the preconcentration of lead ions onto the electrode

Résumé

A flow electrochemical sensor for trace analysis of lead, using TETRAM-modified graphite felt electrode is reported here. TETRAM ligands are covalently immobilized on the graphite felt by chemical reactions on amino acid linkers, previously attached to the electrode by an electrochemical process. The detection is performed in two steps: the preconcentration of Pb2+ ions by complexation with immobilized TETRAM and the analysis by linear sweep stripping voltammetry. A calibration curve typical of at least two equilibrium processes is obtained. A limit of detection of 2.5 × 10−8 mol L−1 is reached for a total analysis time of 35 min. Interestingly, the flow sensor shows a good selectivity toward lead in presence of Cu2+, Cd2+, Ni2+, Zn2+ and Co2+ ions. This new sensor exhibits improved sensitivity and selectivity compared to the previously reported sensor using cyclam-modified electrode. It is stable after three uses, using strong acidic medium for the regeneration step.

Domaines

Catalyse

Dates et versions

hal-00448811 , version 1 (20-01-2010)

Identifiants

Citer

Rihab Nasraoui, Didier Floner, Florence Geneste. Improvement in performance of a flow electrochemical sensor by using carbamoyl-arms polyazamacrocycle for the preconcentration of lead ions onto the electrode. Electrochemistry Communications, 2010, 12 (1), pp.98-100. ⟨10.1016/j.elecom.2009.10.045⟩. ⟨hal-00448811⟩
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