Photoirradiation of dissolved humic acid induces arsenic(III) oxidation.

  title={Photoirradiation of dissolved humic acid induces arsenic(III) oxidation.},
  author={Johanna Buschmann and Silvio Canonica and Ursula Lindauer and Stephan J. Hug and Laura Sigg},
  journal={Environmental science & technology},
  volume={39 24},
The fate of arsenic in aquatic systems is influenced by dissolved natural organic matter (DOM). Using UV-A and visible light from a medium-pressure mercury lamp, the photosensitized oxidation of As(III) to As(V) in the presence of Suwannee River humic acid was investigated. Pseudo-first-order kinetics was observed. For 5 mg L(-1) of dissolved organic carbon (DOC) and 1.85 mEinstein m(-2) s(-1) UV-A fluence rate, the rate coefficient k degrees exp was 21.2 +/- 3.2 10(-5) s(-1), corresponding to… CONTINUE READING