TY - JOUR
T1 - Simultaneous detection of cadmium, copper, and lead using a carbon paste electrode modified with carbamoylphosphonic acid self-assembled monolayer on mesoporous silica (SAMMS)
AU - Yantasee, Wassana
AU - Lin, Yuehe
AU - Fryxell, Glen E.
AU - Busche, Brad J.
N1 - Funding Information:
This work was supported by the SERDP Program, US Department of Defense and the EMSP Program, US Department of Energy (DOE). Pacific Northwest National Laboratory (PNNL) is operated by Battelle Memorial Institute for the US DOE. The research described in this paper was performed in part at the Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by the DOE’s Office of Biological and Environmental Research and located at PNNL. The authors thank Christian D. Johnson for reviewing the manuscript and Prof. Joseph Wang at New Mexico State University for helpful discussion.
PY - 2004/1/30
Y1 - 2004/1/30
N2 - A new sensor was developed for simultaneous detection of cadmium (Cd 2+), copper (Cu2+), and lead (Pb2+), based on the voltammetric response at a carbon paste electrode modified with carbamoylphosphonic 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 30min or with metal ion concentrations ranging from 10 to 200ppb. The responses also evolved in the same fashion as adsorption isotherm in the pH range of 2-6. The metal detection limits were 10ppb after 2min preconcentration and improved to 0.5ppb after 20min preconcentration.
AB - A new sensor was developed for simultaneous detection of cadmium (Cd 2+), copper (Cu2+), and lead (Pb2+), based on the voltammetric response at a carbon paste electrode modified with carbamoylphosphonic 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 30min or with metal ion concentrations ranging from 10 to 200ppb. The responses also evolved in the same fashion as adsorption isotherm in the pH range of 2-6. The metal detection limits were 10ppb after 2min preconcentration and improved to 0.5ppb after 20min preconcentration.
KW - Adsorptive stripping voltammetry
KW - Carbamoylphosphonic acid
KW - Carbon paste electrode
KW - Chemically modified electrode
KW - Self-assembled monolayer
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U2 - 10.1016/j.aca.2003.10.001
DO - 10.1016/j.aca.2003.10.001
M3 - Article
AN - SCOPUS:0347063981
SN - 0003-2670
VL - 502
SP - 207
EP - 212
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 2
ER -