Electroanalysis at salt - cotton - electrode interfaces: preconcentration effects lead to nano-molar Hg(2+) sensitivity

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Abstract

Cotton is employed as a sample absorbent which is analysed sandwiched between a glassy carbon electrode and ammonium nitrate salt in a humidified argon atmosphere (ca. 80% relative humidity). Exploratory experiments show that well-defined voltammetric responses for the Fe(CN)(6)(3-/4-) redox system pre-absorbed into cotton are observed. Experiments with gold plating solution absorbed into cotton reveal the microscopic regions (cotton - glassy carbon contact points) of electrochemical activity where gold microparticles are plated onto the cotton surface. Stripping voltammetry experiments for trace metals such as Hg(2+) pre-absorbed into cotton show a surprisingly high sensitivity with nanomolar detection readily achieved.
Original languageEnglish
Pages (from-to)2149-2155
Number of pages7
JournalElectroanalysis
Volume23
Issue number9
DOIs
Publication statusPublished - Sep 2011

Keywords

  • sensors
  • cotton
  • cellulose
  • electrodeposition
  • humidity
  • voltammetry
  • triple phase boundary
  • glassy carbon
  • gold
  • stripping analysis
  • electrolyte

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