HR: 0800h
AN: OS51C-1316    [Abstracts]
TI: Photochemical Formation of Hydroxyl Radical in Red-Soil-Polluted Seawater in Okinawa, Japan -Potential Impacts on Marine Organisms
AU: * Arakaki, T
EM: arakakit@sci.u-ryukyu.ac.jp
AF: Department of Chemistry, Biology and Marine Science, University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Hamdun, A M
EM: ashoo\_mansoor@yahoo.com
AF: Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Okada, K
EM: k038308@eve.u-ryukyu.ac.jp
AF: Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Kuroki, Y
EM: yukko\_96k@hotmail.com
AF: Department of Chemistry, Biology and Marine Science, University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Ikota, H
EM: hi15513745@yahoo.co.jp
AF: Department of Chemistry, Biology and Marine Science, University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Fujimura, H
EM: fujimura\_h@yahoo.co.jp
AF: Department of Chemistry, Biology and Marine Science, University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Oomori, T
EM: oomori@sci.u-ryukyu.ac.jp
AF: Department of Chemistry, Biology and Marine Science, University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AB: Development of pineapple farmlands and construction of recreational facilities caused runoff of red soil into coastal ocean (locally termed as red-soil-pollution) in the north of Okinawa Island, Japan. In an attempt to understand the impacts of red soil on oxidizing power of the seawater, we studied formation of hydroxyl radical (OH radical), the most potent oxidant in the environment, in red-soil-polluted seawaters, using 313 nm monochromatic light. Photo-formation rates of OH radical showed a good correlation with dissolved iron concentrations (R = 0.98). The major source of OH radical was found to be the Fenton reaction (a reaction between Fe(II) and HOOH). The un-filtered red-soil-polluted seawater samples exhibited faster OH radical formation rates than the filtered samples, suggesting that iron-bearing red soil particles enhanced formation of OH radical.
DE: 4808 Chemical tracers
DE: 4850 Organic marine chemistry
DE: 4852 Photochemistry
DE: 4857 Pollution
DE: 4875 Trace elements
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting