Voltammetric detection of lead(II) and mercury(II) using a carbon paste electrode modified with thiol self-assembled monolayer on mesoporous silica (SAMMS)

Wassana Yantasee, Yuehe Lin, Thomas S. Zemanian, Glen E. Fryxell

Research output: Contribution to journalArticle

153 Citations (Scopus)

Abstract

The anodic stripping voltammetry at a carbon paste electrode modified with thiol terminated self-assembled monolayer on mesoporous silica (SH-SAMMS) provides a new sensor for simultaneous detection of lead (Pb2+) and mercury (Hg2+) in aqueous solutions. The overall analysis involved a two-step procedure: an accumulation step at open circuit, followed by medium exchange to a pure electrolyte solution for the stripping analysis. Factors affecting the performance of the SH-SAMMS modified electrodes were investigated, including electrode activation and regeneration, electrode composition, preconcentration time, electrolysis time, and composition of electrolysis and stripping media. The most sensitive and reliable electrode contained 20% SH-SAMMS and 80% carbon paste. The optimal operating conditions were a sequence with a 2 min preconcentration period, then a 60 s electrolysis period of the preconcentrated species in 0.2 M nitric acid, followed by square wave anodic stripping voltammetry from -1.0 V to 0.6 V in 0.2 M nitric acid. The areas of the peak responses were linear with respect to metal ion concentrations in the ranges of 10-1500 ppb Pb2+ and 20-1600 ppb Hg2+. The detection limits for Pb2+ and Hg2+ were 0.5 ppb Pb2+ and 3 ppb Hg2+ after a 20 min preconcentration period.

Original languageEnglish (US)
Pages (from-to)467-472
Number of pages6
JournalAnalyst
Volume128
Issue number5
DOIs
StatePublished - May 1 2003
Externally publishedYes

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thiol
Self assembled monolayers
Ointments
Mercury
Sulfhydryl Compounds
Silicon Dioxide
Electrodes
electrode
Electrolysis
Carbon
Lead
silica
Silica
carbon
Nitric Acid
electrokinesis
Voltammetry
Nitric acid
nitric acid
Chemical analysis

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Voltammetric detection of lead(II) and mercury(II) using a carbon paste electrode modified with thiol self-assembled monolayer on mesoporous silica (SAMMS). / Yantasee, Wassana; Lin, Yuehe; Zemanian, Thomas S.; Fryxell, Glen E.

In: Analyst, Vol. 128, No. 5, 01.05.2003, p. 467-472.

Research output: Contribution to journalArticle

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