Corpus ID: 42437738

EPR STUDY OF PHOTOONDUCED AND O2 -DEPENDENT CHANGES IN GALLIC ACID-DERIVED MODEL HUMIC SUBSTANCES

@inproceedings{Pawlak2005EPRSO,
  title={EPR STUDY OF PHOTOONDUCED AND O2 -DEPENDENT CHANGES IN GALLIC ACID-DERIVED MODEL HUMIC SUBSTANCES},
  author={A. Pawlak and K. Polewski},
  year={2005}
}
Paramagnetic properties of model humic substances (HS) synthesized from 3,4,5-trihydroxybenzoic acid (gallic acid) were studied by means of EPR spectroscopy. A singlet EPR signal without any fine structure was observed for powder sample with spin density 6×10 18 spin/g, witdh 6.45 Gs and g=2.002. Results of the microwave power saturation pointed to a high dipolar relaxation enhancement. In aqueous solutions a „dark” EPR signal depends on atmosphere and pH. The shapes of EPR spectra are very… Expand
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