期刊
ANALYTICA CHIMICA ACTA
卷 502, 期 2, 页码 207-212出版社
ELSEVIER
DOI: 10.1016/j.aca.2003.10.001
关键词
adsorptive stripping voltammelry; self-assembled monolayer; chemically modified electrode; carbamoylphosphonic acid; carbon paste electrode
A new sensor was developed for simultaneous detection of cadmium (Cu2+), Copper (Cu2+), and lead (Pb2+), based on the voltammetric response at a carbon paste electrode modified with carbarnoylphosphonic acid (acetamide phosphonic acid) self-assembled monolayer (SAM) on mesoporous silica (Ac-Phos SAMMS). The adsorptive stripping voltammetry (AdSV) technique involves preconcentration of the metal ions onto Ac-Phos SAMMS under an open circuit, then electrolysis of the preconcentrated species, followed by a square wave potential sweep towards positive values. Factors affecting the preconcentration process were investigated. The voltammetric responses increased linearly with the preconcentration time from 1 to 30 min or with metal ion concentrations ranging from 10 to 200 ppb. The responses also evolved in the same fashion as adsorption isotherm in the pH range of 2-6. The metal detection limits were 10 ppb after 2 min preconcentration and improved to 0.5 ppb after 20 min preconcentration. (C) 2003 Published by Elsevier B.V.
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