Lead-selective fluorescent optode membrane based on 3,3′,5,5′-tetramethyl-N-(9-anthrylmethyl)benzidine

Wing Hong CHAN*, Rong Hua Yang, Tian Mo, Ke Min Wang

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

44 Citations (Scopus)


A new proton-selective fluorescing indicator, 3,3′,5,5′-tetramethyl-N-(9-anthrylmethyl)benzidine (TMANB) has been synthesized and applied in an optode membrane for the determination of lead ion that works on the basis of a cation-exchange mechanism. When embedded in a plasticized poly(vinyl chloride) (PVC) membrane containing lead ionophore (tert-butylcalix[4]arene-tetrakis(N,N-dimethylthioacetamide)) and a lipophilic anionic site [potassium tetrakis(4-chlorophenyl)borate], TMANB shows a significant fluorescence signal change on exposure to aqueous HCl solution containing lead ion, which exhibits the theoretically expected fluorescence response to lead ion concentration. The selectivity, response time, reproducibility and reversibility, and lifetime of the optode membrane were discussed.

Original languageEnglish
Pages (from-to)123-132
Number of pages10
JournalAnalytica Chimica Acta
Issue number1
Publication statusPublished - 28 May 2002

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

User-Defined Keywords

  • Fluorescent sensor
  • Ion-exchange
  • Lead
  • PVC membrane


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