A selective PVC membrane for di- or trinitrophenol based on N,N-dibenzyl-3,3′,5,5′-tetramethylbenzidine

Hua Yang Rong, Min Wang Ke*, Ping Long Li, Wing Hong CHAN, Hai Yang Xiao

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

5 Citations (Scopus)


A new fluorophore, N,N-dibenzyl-3,3′,5,5′-tetramethylbenzidine (NBTMB), was prepared and shown to exhibit significant and analytical usefulness for optical sensing toward 2,4-dinitrophenol or 2,4,6-trinitrophenol (picric acid) when it was immobilized in a plasticized poly(vinyl chloride) (PVC) membrane. When the membrane was applied to aqueous nitrophenol solution, NBTMB was able to extract selectively nitrophenol into the membrane phase. Since the extraction equilibrium was accompanied by fluorescence quenching of NBTMB, the chemical recognition process could be directly translated into an optical signal. The sensor showed reversible response in the concentration range from 2.0 × 10-7 to 6.0 × 10-5 mol L-1for the detection of 2,4-dinitrophenol in NaOAc-HOAc buffer at pH 4.0. It also showed a fast response time (t95% < 1.5 min) when the sensor was applied to 2,4-dinitrophenol solution at concentration levels of 5.26 × 10-6 and 2.10 × 10-5 mol L-1 alternatively. A working principle is proposed and the responses of this sensor to various kinds of nitrophenol were studied. The sensor was applied to the direct determination of 2,4-dinitrophenol in prepared water samples and the indirect assay of the drug cinchonine and the results obtained were satisfactory.

Original languageEnglish
Pages (from-to)119-124
Number of pages6
JournalThe Analyst
Issue number1
Publication statusPublished - 2002

Scopus Subject Areas

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


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