Hollow fiber membrane concentrator for on-line preconcentration

Edmund J. Bishop, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Solvent removal by membrane permeation is presented as a method for on-line preconcentration. Experiments were carried out to develop a one-step, on-line, concentration process using a microporous composite hydrophobic membrane, or a polar solvent-permeable Nafion membrane depending on the solvent. Both polar and non-polar hollow fiber membranes were found to be effective in concentrating trace analytes. A large increase in analyte enrichment factors was found for both concentrator modules. Enrichment factors as high as 18.9 were observed. Residence time and operating temperature were found to be important parameters. Several different model compounds were preconcentrated. Further, in a Nafion membrane (polar solvent-permeable), analyte interaction with membrane bound sulfonic acid residues resulted in the loss of reactive analytes such as atrazine (ATZ). All analytes were successfully concentrated and detected using a polypropylene-siloxane composite membrane system when hexane was used as the solvent.

Original languageEnglish (US)
Pages (from-to)11-17
Number of pages7
JournalJournal of Chromatography A
Issue number1-2
StatePublished - Aug 13 2004

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry


  • Atrazine
  • Biphenyl
  • Hollow fiber membranes
  • Naphthalene
  • Pentachlorophenol
  • Sample preparation


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