沖縄島沿岸における大気 : 海水間の過酸化水素の挙動

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We studied hydrogen peroxide (H_2O_2) concentrations in seawater to better understand contribution of air-to-seawater partitioning of gaseous H_2O_2 during clear-sky conditions. Hydrogen peroxide concentrations were determined by POHPAA dimmer technique with a flow injection system. We collected coastal seawater at Sesoko Island and Hama-gyokou fishing port in Okinawa Island. The seawater samples were exposed to solar radiation in three different conditions. First condition in natural seawater, named "Open seawater", which is influenced by all the natural conditions such as solar radiation, seawater mixing, tidal movement, and microbial and phytoplankton activities. Second condition is seawater kept in the plastic container, named "Closed seawater", which avoids influences of seawater mixing and tidal movement. Third condition is seawater kept in quartz test tubes, named "Test Tube seawater", which avoids influences of seawater movement and air-to-seawater partitioning of H_2O_2. Comparison between Open and Closed seawaters showed that H_2O_2 concentrations in Open seawater were almost always lower than that of Closed seawaters, indicating that H_2O_2 concentrations were strongly influenced by seawater mixing, tidal movement, and microbial and phytoplankton activities. Comparison between Closed and Test Tube seawaters showed little difference in H_2O_2 concentrations between the two conditions, indicating that air-to-seawater partitioning of H_2O_2 had little influence on H_2O_2 concentrations in seawater during clear-sky conditions, and that increase in H_2O_2 concentration was mainly due to in situ photochemical reactions.
2007-05-25

沖縄島沿岸における大気 : 海水間の過酸化水素の挙動

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