Photoirradiation of Dissolved Humic Acid Induces Arsenic(III) Oxidation

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 kineti...

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Veröffentlicht in:	Environmental science & technology 2005-12, Vol.39 (24), p.9541-9546
Hauptverfasser:	Buschmann, Johanna, Canonica, Silvio, Lindauer, Ursula, Hug, Stephan J, Sigg, Laura
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Arsenic Arsenic - chemistry Arsenic content Bangladesh Biological and physicochemical phenomena Carbon - chemistry Cations Comparative analysis Dissolved organic carbon Drinking water Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Fresh water freshwater lakes heavy water Humic acids Humic Substances hydrogen peroxide Hydroxyl radicals Iron - chemistry Kinetics Mercury Natural water pollution Organic Chemicals - chemistry Organic matter Oryza sativa Oxidation Oxidation-Reduction Oxygen Photochemistry Pollution Pollution, environment geology Q1 Q2 Q3 Rice fields Rivers scavengers USA, Florida, Suwannee R Water - chemistry Water Pollutants, Chemical - analysis Water treatment and pollution
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Zusammenfassung:	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°exp was 21.2 ± 3.2 10-5 s-1, corresponding to a half-life
ISSN:	0013-936X 1520-5851
DOI:	10.1021/es051597r