Electrochemical sensor based on carbon paste electrode modified with nanostructured cryptomelane-type manganese oxides for detection of heavy metals

Xiaoli Cui, Guodong Liu, Liyu Li, Wassana Yantasee, Yuehe Lin

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A carbon paste electrode modified with nanostructured cryptomelane-type (potassium) manganese oxides was evaluated as new electrochemical sensor for the detection of heavy metal ions in aqueous media. The cryptomelane-type manganese oxides are nanofibrous crystals with sub-nanometer tunnels which provide excellent sites for ion-exchanges. The adsorptive stripping voltammetry (ASV) technique involves preconcentration of the metal ions into nanostructured cryptomelane-type manganese oxides 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 using lead ion as the model analyte. The voltammetric responses increased with the preconcentration time from 2 to 30 min, and also linearly with lead ion concentrations ranging from 50 to 1200 ppb. The detection limits of target metal ion were 10 ppb after 4 min preconcentration and improved to 1 ppb after 20 min preconcentration. The potential for simultaneous detection of lead, silver, and copper is also discussed.

Original languageEnglish (US)
Pages (from-to)16-21
Number of pages6
JournalSensor Letters
Volume3
Issue number1
DOIs
StatePublished - Mar 2005
Externally publishedYes

Fingerprint

Electrochemical sensors
Manganese oxide
manganese oxides
heavy metals
Heavy metals
Metal ions
metal ions
Lead
Electrodes
Carbon
electrodes
carbon
sensors
potassium oxides
square waves
Ions
electrolysis
Voltammetry
ion concentration
stripping

Keywords

  • Adsorptive Stripping Voltammetry
  • Carbon Paste Electrode
  • Chemically Modified Electrode
  • Heavy Metals
  • Nanostructured Cryptomelane-Type Manganese Oxides

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Signal Processing
  • Control and Systems Engineering

Cite this

Electrochemical sensor based on carbon paste electrode modified with nanostructured cryptomelane-type manganese oxides for detection of heavy metals. / Cui, Xiaoli; Liu, Guodong; Li, Liyu; Yantasee, Wassana; Lin, Yuehe.

In: Sensor Letters, Vol. 3, No. 1, 03.2005, p. 16-21.

Research output: Contribution to journalArticle

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