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Chromophoric dissolved organic matter (CDOM) generates singlet oxygen (1O2), crucial for environmental photochemistry. This study quanties 1O2 yields, finding hydrophobic neutral fractions most effective, with yields decreasing at longer excitation wavelengths.

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Area of Science:

  • Environmental Chemistry
  • Photochemistry
  • Organic Geochemistry

Background:

  • Singlet oxygen (1O2) generation by chromophoric dissolved organic matter (CDOM) is a key photoprocess.
  • Existing literature shows wide-ranging 1O2 quantum yields (ΦΔ) even for standardized samples.
  • Understanding these yields is vital for assessing CDOM's environmental impact.

Purpose of the Study:

  • To accurately determine 1O2 quantum yields (ΦΔ) for various dissolved organic matter (DOM) isolates and natural waters.
  • To investigate the excitation wavelength dependence of 1O2 generation from CDOM.
  • To clarify discrepancies in previously reported 1O2 quantum yields.

Main Methods:

  • Time-resolved 1O2 phosphorescence spectroscopy was employed.
  • Measurements were conducted on a variety of DOM isolates and natural water samples.
  • The excitation wavelength dependence of 1O2 generation was systematically examined.

Main Results:

  • Measured 1O2 quantum yields generally fell within the lower to middle range of previously reported values.
  • Hydrophobic neutral fractions of DOM isolates exhibited the highest 1O2 quantum yields.
  • A decrease in 1O2 generation was observed with increasing excitation wavelength.

Conclusions:

  • This study provides precise 1O2 quantum yield data for DOM, refining existing knowledge.
  • The significant 1O2 production by hydrophobic neutral DOM fractions highlights their importance.
  • Understanding wavelength-dependent 1O2 production is critical for predicting CDOM's environmental photochemistry.