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Catchment-scale fluorescence water quality determination.

A Baker1, R Inverarity, D Ward

  • 1School of Geography, Earth and Environmental Sciences, The University of Birmingham, Birmingham, B15 2TT, UK.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|February 1, 2006
PubMed
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River water fluorescence, specifically tryptophan-like intensity, strongly correlates with key chemical water quality indicators like nitrate and phosphate. This fluorescence measurement offers a reliable assessment of river water quality, including biochemical oxygen demand.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Water Quality Monitoring

Background:

  • River water quality is crucial for ecosystem health and human use.
  • Traditional water quality assessments can be time-consuming and resource-intensive.
  • Fluorescence spectroscopy offers a potential rapid and sensitive method for water quality analysis.

Purpose of the Study:

  • To investigate the relationship between chemical water quality parameters and tryptophan-like fluorescence intensity in the River Tyne.
  • To assess the utility of tryptophan-like fluorescence as an indicator of river water quality.
  • To compare fluorescence measurements with established water quality assessments.

Main Methods:

  • Water samples were collected from the River Tyne.

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  • Chemical parameters including nitrate, phosphate, ammonia, biochemical oxygen demand (BOD), and dissolved oxygen were measured.
  • Tryptophan-like fluorescence intensity was determined using both bench and portable spectrometers.
  • Statistical analysis was performed to identify correlations between fluorescence intensity and chemical parameters.

    • Main Results:

    • Significant positive correlations were found between tryptophan-like fluorescence intensity and nitrate (r = 0.87), phosphate (r = 0.80), ammonia (r = 0.70), and BOD (r = 0.85).
    • A significant negative correlation was observed with dissolved oxygen (r = -0.65).
    • The strongest correlations were with nitrate and phosphate, primarily linked to sewage inputs.
    • Mean annual fluorescence intensity correlated well with the Environment Agency's General Water Quality Assessment.

    Conclusions:

    • Tryptophan-like fluorescence intensity is a strong indicator of several key chemical water quality parameters in the River Tyne.
    • This fluorescence measurement provides a reliable and potentially rapid method for assessing overall river water quality.
    • The findings support the use of fluorescence spectroscopy as a valuable tool for environmental monitoring and water management.