Simultaneous Detection of Cadmium, Copper, and Lead using A Carbon Paste Electrode Modified with Carbamoylphosphonic Acid Self-Assembled Monolayer on Mesoporous Silica (SAMMS)

Journal Article · Fri Jan 30 04:00:00 EST 2004 · Analytica Chimica Acta

DOI:https://doi.org/10.1016/j.aca.2003.10.001· OSTI ID:15006556

Yantasee, Wassana ^[1]; Lin, Yuehe ^[1]; Fryxell, Glen E ^[1]; Busche, Brad J ^[1]

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1. BATTELLE (PACIFIC NW LAB)

A new sensor was developed for simultaneous detection of cadmium (Cd2+), 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 on mesoporous silica (Ac-Phos SAMMS). The adsorptive stripping voltammetry 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 minutes 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 minutes preconcentration and improved to 0.5 ppb after 20 minutes preconcentration.

• Research Organization: Pacific Northwest National Lab., Richland, WA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 15006556
• Report Number(s): PNNL-SA-39324; 400403209
• Journal Information: Analytica Chimica Acta, Journal Name: Analytica Chimica Acta Journal Issue: 2 Vol. 502; ISSN ACACAM; ISSN 0003-2670
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ADSORPTION ISOTHERMS
CADMIUM
CARBON
COPPER
DETECTION
ELECTROCHEMICAL SENSOR
ELECTRODES
ELECTROLYTIC CELLS
LEAD
PHOSPHONIC ACIDS
SAMMS
SENSITIVITY
SILICA
VOLTAMETRY