Achieving High Time-Resolution with a New Flow-through Type Analyzer for Total Inorganic Carbon in Seawater.

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  • KIMOTO Hideshi
    Kimoto Electric Co., Ltd.
  • NOZAKI Ken
    Energy Electronics Institute, National Institutes of Advanced Industrial Science and Technology
  • KUDO Setsuko
    Japan Science and Technology Corporation, Department of Earth and Planetary Science, The University of Tokyo
  • KATO Ken
    Energy Electronics Institute, National Institutes of Advanced Industrial Science and Technology
  • NEGISHI Akira
    Energy Electronics Institute, National Institutes of Advanced Industrial Science and Technology
  • KAYANNE Hajime
    Japan Science and Technology Corporation, Department of Earth and Planetary Science, The University of Tokyo Department of Earth and Planetary Science, The University of Tokyo

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A fully automated, continuous-flow-through type analyzer was developed to observe rapid changes in the concentration of total inorganic carbon (CT) in coastal zones. Seawater and an H3PO4 solution were fed into the analyzer’s mixing coil by two high-precision valveless piston pumps. The CO2 was stripped from the seawater and moved into a carrier gas, using a newly developed continuous-flow-through CO2 extractor. A mass flow controller was used to assure a precise flow rate of the carrier gas. The CO2 concentration was then determined with a nondispersive infrared gas analyzer. This analyzer achieved a time-resolution of as good as 1 min. In field experiments on a shallow reef flat of Shiraho (Ishigaki Island, Southwest Japan), the analyzer detected short-term, yet extreme, variations in CT which manual sampling missed. Analytical values obtained by the analyzer on the boat were compared with those determined by potentiometric titration with a closed cell in a laboratory: CT(flow-through) = 0.980·CT(titration) + 38.8 with r2 = 0.995 (n = 34; September 1998).

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  • Analytical Sciences

    Analytical Sciences 18 (3), 247-253, 2002

    社団法人 日本分析化学会

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