Determination of aluminum ions by indirect potentiometry in a flow system

J. Catherine Ngila, Peter W. Alexander, D. Brynn Hibbert

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A potentiometric system is described for the indirect flow determination of Al3+ with an aluminum wire as indicator electrode. The method is based on the reaction between aluminum and fluoride ions at pH 5.0 in acetate buffer. The reduction in activity of fluoride ions is detected by the aluminum electrode. The response was optimized for the flow rate of solution, length of reaction tubing, concentration of fluoride reagent, and pH of the buffer. The response was linear with concentration of aluminum in the range of 0.5 to 50 ppm with a relative standard deviation (RSD) of 0.7%. There was negligible interference from a range of cations and anions when their concentrations were less than 20 ppm.

Original languageEnglish
Pages (from-to)990-995
Number of pages6
Issue number11-12
Publication statusPublished - 1994
Externally publishedYes


  • Aluminum determination
  • Aluminum wire
  • Flow analysis
  • Indirect determination

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry


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