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Stripping Voltammetry of Cerium(IIl) with a Chemically Modified Carbon Paste Electrode Containing Functionalized Nanoporous Silica Gel
Author(s) -
Javanbakht Mehran,
Khoshsafar Hamid,
Ganjali Mohammad Reza,
Norouzi Parviz,
Badei Alireza,
Hasheminasab Abed
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200704038
Subject(s) - cerium , nanoporous , adsorptive stripping voltammetry , anodic stripping voltammetry , stripping (fiber) , electrode , carbon paste electrode , supporting electrolyte , electrochemistry , voltammetry , silica gel , electrolyte , chemistry , inorganic chemistry , materials science , detection limit , cyclic voltammetry , nuclear chemistry , chromatography , organic chemistry , composite material
This research introduces the design of an adsorptive stripping voltammetric method for the cerium(III) determination at a carbon paste electrode, chemically modified with dipyridyl‐functionalized nanoporous silica gel (DPNSG‐CPE). The electroanalytical procedure comprised two steps: the Ce(III) chemical accumulation at −200 mV followed by the electrochemical detection of the Ce(III)/dipyridyl complex, using anodic stripping voltammetry. The factors, influencing the adsorptive stripping performance, were optimized including the modifier quantity in the paste, the electrolyte concentrations, the solution pH and the accumulation potential or time. The resulting electrode demonstrated a linear response over a wide range of Ce(III) concentration (1.0–28 ng mL −1 ). The precision for seven determinations of 4 and 10 ng mL −1 Ce(III) was 3.2% and 2.5% (relative standard deviation), respectively. The prepared electrode was used for the cerium determination in real samples and very good recovery results were obtained.