HR: 0830h
AN: OS31C-0222    [PDF]
TI: Photochemical Formation of Fe(II) and Peroxides in Coastal Seawater Collected around Okinawa Island, Japan - Impact of Red Soil Pollution
AU: * Okada, K
EM: e993316@eve.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Nakajima, H
EM: nakajin108@yahoo.co.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Higuchi, T
EM: tomi-h.0311@k8.dion.ne.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Fujimura, H
EM: footsun@mac.com
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Arakaki, T
EM: arakakit@sci.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AU: Taira, H
EM: htaira@sci.u-ryukyu.ac.jp
AF: University of the Ryukyus, 1 Senbaru Nishihara-cho, Okinawa, 903-0213 Japan
AB: In a study to elucidate the impacts of red soil pollution on the oxidizing power of seawater, photochemical formation of Fe(II) and peroxides was studied in seawaters collected around Okinawa Island, Japan. The northern part of Okinawa Island suffers from red soil pollution which is caused mainly by land development such as pineapple farming and the construction of recreational facilities. We studied photochemical formation of peroxides and Fe(II) in the same seawater samples because the reaction between HOOH and Fe(II) forms hydroxyl radical (OH radical), the most potent environmental oxidant. Photochemical formation of Fe(II) was fast and reached steady-state in 30 minutes of simulated sunlight illumination and the steady-state Fe(II) concentrations were about 80% of total iron concentrations. Photochemical formation of peroxides was relatively slow and formation kinetics varied, depending on the initial peroxide concentrations. Because photochemical formation of peroxides was faster and total iron concentrations in the red soil polluted seawater were higher, red soil polluted seawater is expected to have greater oxidizing power than seawater that is not polluted with red soil.
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
DE: 4251 Marine pollution
DE: 4504 Air/sea interactions (0312)
DE: 4807 Chemical speciation and complexation
DE: 4852 Photochemistry
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting