Waite, T. D., University of New South Wales, Sydney, Australia, d.waite@unsw.edu.au
Rose, A. L., University of New South Wales, Sydney, Australia, andrew.rose@unsw.edu.au
Garg, S. ., University of New South Wales, Sydney, Australia, s.garg@unsw.edu.au

KINETIC MODELLING OF THE LIGHT-INDUCED REDOX CYCLING OF IRON IN SEAWATER IN THE PRESENCE OF NATURAL ORGANIC MATTER

We have conducted a series of laboratory studies to investigate the generation of ferrous iron and reactive oxygen species when solutions of seawater containing natural organic matter and ferric iron are exposed to simulated sunlight. Total ferrous iron, superoxide and hydrogen peroxide were measured at nanomolar concentrations with high temporal resolution using chemiluminescence-based methods. In all cases, ferrous iron concentrations rapidly peaked at several nanomoles per litre after a few minutes, and then declined over time. Superoxide concentrations followed a similar profile, while hydrogen peroxide concentrations increased in a non-linear manner. A numerical kinetic model was developed based on fundamental chemical reactions, and provided an excellent fit to the data.

http://www.civeng.unsw.edu.au/staff/david.waite/

Oral presentation

Presentation is given by student: No
Session #:SS01
Date: Friday, June 13, 2008
Time: 11:00 AM

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