Distinguishing stage 1 and 2 reverse osmosis permeates using fluorescence spectroscopy

S Singh, RK Henderson, Andrew Baker, RM Stuetz, SJ Khan

Research output: Contribution to journalArticle

11 Citations (Scopus)


Fluorescence excitation-emission matrix (EEM) spectroscopy was used to distinguish between two stages of reverse osmosis (RO) permeates as the first step towards investigating the potential application of fluorescence as a monitoring tool for membrane performance. The signal response of several fluorescence peaks present in Stage 1 and Stage 2 RO permeates of an advanced water treatment plant were compared. The humic-like fluorescence region was found to have the largest percentage difference between stages and therefore was the most appropriate for enabling differentiation. Increases in humic-like fluorescence did not correlate with increases in conductivity or dissolved organic carbon measurements. This suggests that fluorescence is a more selective and sensitive method for monitoring the organic composition of RO permeates than established methods. Fluorescence is therefore a promising tool for improved water quality monitoring of RO permeates.
Original languageEnglish
Pages (from-to)2017-2023
Number of pages7
JournalWater Science and Technology
Issue number8
Publication statusPublished - 1 Oct 2009


  • water quality monitoring
  • conductivity
  • fluorescence
  • reverse osmosis


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