Premium
Preconcentration and Electroanalysis of Copper(II) in Ammoniacal Medium on Nontronite/Cellulose Acetate Modified Electrodes
Author(s) -
Zen JyhMyng,
Wang HsuFang,
Senthil Kumar Annamalai,
Yang HsuehHui,
Dharuman Venkataraman
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200201)14:2<99::aid-elan99>3.0.co;2-w
Subject(s) - nontronite , cellulose acetate , copper , voltammetry , chemistry , detection limit , inorganic chemistry , glassy carbon , cellulose , cyclic voltammetry , electrochemistry , nuclear chemistry , electrode , chromatography , organic chemistry , clay minerals , mineralogy
Nontronite/cellulose acetate‐coated glassy carbon electrodes (NCA/GCEs) were evaluated for the preconcentration and electroanalysis of Cu 2+ in ammoniacal medium by square‐wave voltammetry. The NCA/GCEs exhibit good accumulation ability for the [Cu(NH 3 ) 4 ] 2+ complex ion via the ion‐exchange ability of nontronite. A permselective membrane, cellulose acetate, was applied to strengthen the mechanical stability of the nontronite coating on GCE and to prevent the interference from surface‐active compounds. The experimental parameters were studied in detail. The NCA/GCEs show good reproducibility with a relative standard deviation of 2.83% for 15 successive determination of 20 ppb Cu 2+ . Under optimized conditions, a linear calibration plot was obtained up to 4 ppm Cu 2+ with a detection limit (S/N=3) of 1.73 ppb after a preconcentration time of 2 minutes in pH 10 ammonia solution. The practical utility of the NCA/GCEs was illustrated by the measurement of Cu 2+ in tap water, groundwater, and pond water.