Fiber-optic Sensing of Carbon Dioxide Dissolved in Sea Water Using a Flow Cell with a Hollow Fiber

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  • SUDOH Masao
    Department of Materials Science and Chemical Engineering, Shizuoka University
  • ICHIKAWA Yoshihisa
    Department of Materials Science and Chemical Engineering, Shizuoka University
  • OKAJIMA Keiichi
    Department of Materials Science and Chemical Engineering, Shizuoka University
  • SUZUKI Yoshimi
    Deprtment of Biology and Geoscience, Shizuoka University

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Other Title
  • ホローファイバー流通型セルによる海水溶存二酸化炭素の光センシング
  • ホローファイバー リュウツウガタ セル ニ ヨル カイスイ ヨウゾン 2サンカタンソ ノ ヒカリ センシング

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Abstract

Recently, global warming caused by increases in atmospheric CO2 concentration has been noticed. It is necessary to measure pCO2 (CO2 partial pressure) in the ocean as a driving force of CO2 transfer in spatiotemporal high density in order to verify this CO2 cycle. Measurement by buoys and small ships is useful, thus a convenient pCO2 measuring method with small equipment is desired. This sensor consisted of optical fibers, a fluorescence pH indicator (HPTS) solution and a hollow fiber of gas permeable membrane. This sensor measured pCO2 with respect to fluorescence intensity changes by pH changes in an indicator solution.<BR>In this paper, performance such as response rate and sensitivity of a flow cell type sensor were examined and compared to the previous results of a probe type sensor. The response characteristics of the flow cell type sensor were affected by the residence time of the indicator solution in a hollow fiber. When the flow rate of the indicator solution was 0.26ml/min for the silicone hollow fiber membrane, SIR A with I.D. of 0.5mm, a length of membrane over 6m was necessary in order to measure pCO2 200 - 600 ppmv in water. When the length of the membrane was 8m, fluorescence intensity was saturated under 8.5min. There was no difference in the response in the sea water and the distilled water. The fluorescence intensity decreased with a decrease in temperature. The pCO2 change in the environment was measured continuously for a few days using the flow cell type sensor of a hollow fiber, and correlated to the pCO2 detected by NDIR in consideration of the temperature correction.ater.

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