Design of a simple optical sensor for the detection of concentrated hydroxide ions in an unusual pH range

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Abstract

The failure of conventional electrochemical sensors at pH 9 and above necessitates research into suitable sensor materials and novel sensor chemistries for reliable process monitoring in extremely alkaline media. A novel sensing chemistry for high hydroxide monitoring is reported using 2-pyridylazo compounds doped in polystyrene films. Spectroscopic experiments demonstrate that the absorbance properties of 1-(2-pyridylazo)naphthol in polymeric media could be used to produce a reliable hydroxide sensor. When tested for continuous measurements in relatively high temperature and highly alkaline electroless gold plating baths, the sensor exhibits adequate reversibility, a response time of seconds and a standard deviation of 2σ at the 99.7% confidence interval.

Original languageEnglish (US)
Pages (from-to)1783-1786
Number of pages4
JournalAnalyst
Volume125
Issue number10
DOIs
StatePublished - 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

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