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Journal of Oceanography

, Volume 61, Issue 3, pp 561–568 | Cite as

Simultaneous Measurement of Hydrogen Peroxide and Fe Species (Fe(II) and Fe(tot)) in Okinawa Island Seawater: Impacts of Red Soil Pollution

  • Takemitsu ArakakiEmail author
  • Hiroyuki Fujimura
  • Asha Mansour Hamdun
  • Kouichirou Okada
  • Hiroaki Kondo
  • Tamotsu Oomori
  • Akira Tanahara
  • Hatsuo Taira
Article

Abstract

The northern part of Okinawa Island suffers from red soil pollution—runoff of red soil into coastal seawater—which damages coastal ecosystems and scenery. To elucidate the impacts of red soil pollution on the oxidizing power of seawater, hydrogen peroxide (HOOH) and iron species including Fe(II) and total iron (Fe(tot), defined as the sum of Fe(II) and Fe(III)) were measured simultaneously in seawater from Taira Bay (red-soil-polluted sea) and Sesoko Island (unpolluted sea), off the northern part of Okinawa Island, Japan. We performed simultaneous measurements of HOOH and Fe(II) because the reaction between HOOH and Fe(II) forms hydroxyl radical (•OH), the most potent environmental oxidant. Gas-phase HOOH concentrations were also measured to better understand the sources of HOOH in seawater. Both HOOH and Fe(II) in seawater showed a clear diurnal variation, i.e. higher in the daytime and lower at night, while Fe(tot) concentrations were relatively constant throughout the sampling period. Fe(II) and Fe(tot) concentrations were approximately 58% and 19% higher in red-soil-polluted seawater than in unpolluted seawater. Gas-phase HOOH and seawater HOOH concentrations were comparable at both sampling sites, ranging from 1.4 to 5.4 ppbv in air and 30 to 160 nM in seawater. Since Fe(II) concentrations were higher in red-soil-polluted seawater while concentrations of HOOH were similar, •OH would form faster in red-soil-polluted seawater than in unpolluted seawater. Since the major scavenger of •OH, Br, is expected to have similar concentrations at both sites, red-soil-polluted seawater is expected to have higher steady-state •OH concentrations.

Keywords

Fe(II) hydrogen peroxide red soil pollution oxidizing power photochemistry hydroxyl radical Okinawa 

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Takemitsu Arakaki
    • 1
    Email author
  • Hiroyuki Fujimura
    • 1
  • Asha Mansour Hamdun
    • 1
  • Kouichirou Okada
    • 1
  • Hiroaki Kondo
    • 1
  • Tamotsu Oomori
    • 1
  • Akira Tanahara
    • 2
  • Hatsuo Taira
    • 1
  1. 1.Department of Chemistry, Biology and Marine Science, Faculty of ScienceUniversity of the RyukyusSenbaru, Nishihara-cho, OkinawaJapan
  2. 2.Instrument Research CenterUniversity of the RyukyusSenbaru, Nishihara-cho, OkinawaJapan

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